Moddable | Blog

Re-Introducing Moddable Six: More Power You Can Use

December 9, 2025 | Peter Hoddie, Principal

We're pleased to announce an upgrade of Moddable Six, our most popular development board for Embedded JavaScript. In fact, we sold out of the original production! The rise of realtime AI APIs inspired us to upgrade the audio capabilities of Moddable Six.
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Displays, Ethernet, and More Boards Land in Zephyr Port

December 4, 2025 | Peter Hoddie, Principal

The Moddable SDK port to Zephyr continues to blast ahead. This release brings support for displays, more networking options, and additional silicon. Perhaps most importantly, we have ported our unit test runners, which lets us perform in-depth testing on Zephyr.
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Moddable SDK on Zephyr RTOS Advancing Quickly with Networking, BLE, and More Storage

November 6, 2025 | Peter Hoddie, Principal

Our work to bring modern JavaScript to the popular Zephyr RTOS is advancing with unprecedented speed. The latest update adds support for network communication, a BLE central, storage, and support for Espressif's ESP32 silicon family.
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New Native API Improves Embedded JavaScript Access to AI Agents, TypeScript, ESLint, and Beyond

November 6, 2025 | Peter Hoddie, Principal

Part of what makes JavaScript developers so productive is the vast ecosystem of tools that has grown around the language. There are tools to check your code for correctness like TypeScript and ESLint, LLM-based AI Agents to answer your coding questions and help write code, and intelligent code editors that provide predictive text entry and immediate syntax checking. Embedded JavaScript developers working with the Moddable SDK use all of these. But there have been limits. Learn how Moddable is growing access to the JavaScript ecosystem for Embedded JavaScript developers.
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Modern JavaScript for Zephyr

October 3, 2025 | Peter Hoddie, Principal

Moddable is pleased to share that we're 're bringing the Moddable SDK to Zephyr, the Linux Foundation's RTOS. The Moddable SDK brings industry-standard JavaScript to Zephyr, while giving embedded JavaScript developers access to a wide variety of new development boards from STMicroelectronics and many others.
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Why Moddable supports JS0/JSSugar

November 13, 2024 | Peter Hoddie, Principal

The "JS0/JSSugar" proposal by Apple, Google, Moddable, Mozilla, and Sony would change how the JavaScript evolves by dividing into two parts to make it even more secure for users. Moddable believes this change will benefit embedded JavaScript developers using the Moddable SDK in many ways, without changing the way developers work.
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Using the ESP Component Registry with the Moddable SDK

October 12, 2024 | Michael Kellner, Embedded Engineer

The ESP Component Registry is a central repository of components designed for the ESP‑IDF. Hosted by Espressif, creator of the ESP32, the Registry contains a wealth of ready-to-go software components for the ESP32 family of microcontrollers.
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Introducing Moddable Six

July 26, 2024 | Peter Hoddie, Principal

Embedded developers have hundreds of development boards to choose from. Moddable Six is for developers who want to use industry standard JavaScript to deliver dynamic IoT projects, especially those with a rich, mobile-style user experience. The clean, compact design of Moddable Six is the perfect place to develop your IoT concept and can be easily integrated as a display module in your commercial product or personal project.
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Inside XS: Scopes

June 26, 2024 | Patrick Soquet, Software Architect

The XS JavaScript engine is unique in delivering modern JavaScript (ECMAScript 2024) to resource-constrained, low-cost microcontrollers. One reason XS can do so much with so few resources is thanks to the careful design of its internal data structures.
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Introducing Moddable Display

Jan 13, 2024 | Peter Hoddie, Principal

We created Moddable Display to be the first step your project takes out into the real world. After you've done the hard work of creating a project, you want to show it off, use it in your everyday life, or give to your friends and family.
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Year in Review: Moddable in 2023

Dec 29, 2023 | Peter Hoddie, Principal

The arrival of 2024 is an opportunity to reflect on the amazing progress we made in 2023. Our mission has always been to bring the benefits of standard, modern JavaScript to embedded developers. Our work over the past year highlights our wide-ranging efforts in support of that mission.
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Update Moddable Four Firmware with BLE

Nov 15, 2023 | Mike Kellner

We've recently added the ability to use BLE to update the firmware of Moddable Four and other nRF52 devices with a mobile app. This capability is essential for products in the real-world to allow customers to easily install updates that deliver new features and security fixes. Read More

Advanced Debugging – Tracepoints

Nov 3, 2023 | Peter Hoddie, Principal

Tracepoints log JavaScript expressions to the debug console without modifying your source code. Tracepoints are added while your program is running, streamlining your debug session. This article introduces advanced techniques for creating and controlling tracepoints, including the use of a device button to enable tracepoints. Read More

Advanced Debugging – Function Breakpoints

Oct 22, 2023 | Peter Hoddie, Principal

Function breakpoints are a specialized type of breakpoint that can help you quickly debug and explore a large code base. They allow you to quickly locate which implementations of a given function name are being executed without having to set breakpoints manually on each implementation of the function. Read More

Advanced Debugging – Conditional Breakpoints

Oct 22, 2023 | Peter Hoddie, Principal

Conditional breakpoints let you control when a breakpoint stops based on conditions like the value of local variables and the number of times the breakpoint has been encountered. Conditional breakpoints allow you to stop only when the specific conditions have been met. Read More

Advanced Graphics on an Energy Budget

Sept 15, 2023 | Peter Hoddie, Principal

We believe a great product should be both energy efficient and easy to use. Moddable Four has a display to make it easier to use. Most other ultra-low energy boards don't have a screen to help save energy. Read More

Battery Saving JavaScript Tips for Nordic nRF52

Aug 24, 2023 | Peter Hoddie, Principal

With the introduction of Moddable Four, industry-standard modern JavaScript can now power the ultra-low power Nordic nRF52 microcontroller. Operating for a year (or more) on a coin-cell battery in a compact form-factor opens a world of new possibilities for products and projects. Read More

Introducing Moddable Four

Aug 10, 2023 | Peter Hoddie, Principal

Moddable Four is the new ultra-low power development board for Embedded JavaScript developers from Moddable. Moddable Four pairs the ultra-low power Nordic nRF52 microcontroller with integrated BLE and an ultra-low power Sharp memory display in a compact module that can operate for up to a year, with the display on, using a coin cell battery. Read More

Securing Your IoT Product: Beware of Point Solutions

July 6, 2023 | Peter Hoddie, Principal

At Sensors Converge 2023, there was a surprising amount of talk about IoT security for a sensor trade show. That's an encouraging sign. Manufacturers of sensors for consumer and industrial IoT products are increasingly aware of the importance of securing sensor data to protect user privacy and safeguard critical infrastructure. Read More

Moddable @ Sensors Converge 2023

June 27, 2023 | Peter Hoddie, Principal

Moddable recently took part in the Sensors Converge 2023 conference. Located in the heart of Silicon Valley, it lived up to its billing as "North America’s largest electronics event for design engineers." The show covered all aspects of IoT, from sensors (of course!) to energy management, embedded software development, security, cloud connectivity, and more. Read More

Embedded JavaScript at FOSDEM 2023

March 3, 2023 | Peter Hoddie, Principal

Moddable was honored to exhibit at FOSDEM 2023 in Brussels, Belgium. FOSDEM is the preeminent open source software event in Europe. We were very fortunate to have a stand dedicated to open source Embedded JavaScript because lingering pandemic concerns limited the number of exhibitors. Our stand was in the IoT area, which was busy throughout the weekend event. Read More

Year in Review: Moddable in 2022

January 2, 2023 | Peter Hoddie, Principal

The end of the year is an opportunity to look back at the amazing progress Moddable has made in our mission to bring the power of the JavaScript ecosystem to embedded developers. The Moddable SDK continues to grow in both breadth and depth to support new devices, new capabilities, and familiar APIs, giving developers an ever-expanding set of possibilities for their products. Read More

A Very Moddable Holiday Wreath

December 23, 2022 | Peter Hoddie, Principal

All year the team at Moddable works with our clients and community of developers to bring the power of the JavaScript ecosystem to embedded developers. The end of the year at Moddable is an opportunity for us to build a project using the technology we’ve been building all year. This year’s project weaves Neopixels into a holiday wreath along with a speaker to play Christmas carols. Read More

Optimizing Life Using the XS Performance Profiler

December 9, 2022 | Peter Hoddie, Principal

A great way to learn how to use the Moddable SDK's performance profiler effectively to optimize your code is to see how other developers use it to optimize their code. In this article, you'll see how I adapted and optimized JavaScript code written for the web to run well on an ESP32 embedded microcontroller. I used the classic "Game of Life" simulation for this project. Spoiler: the performance improves by nearly 10x. … Read More

Deliver High-Performance Products with the XS Profiler

November 16, 2022 | Peter Hoddie, Principal

Everyone involved in delivering software for resource-constrained hardware knows that performance is a key challenge. Low-cost hardware has just enough performance to make a great product possible, but only if the software is careful not to overwhelm the hardware. It is easy to notice that a product is performing slowly. What's difficult is figuring out why it is slow. That's where a performance profiler is critical. Instead of a software developer relying on intuition to guess which functions take the most time, a profiler shows them. … Read More

Guaranteeing Reliable IoT Products on Unreliable Networks

September 12, 2022 | Peter Hoddie, Principal

Maintaining a reliable network connection to the internet is fundamental to IoT products. Unfortunately, network connections aren’t reliable: they can fail in many ways. Products must be engineered to operate reliably on unreliable infrastructure. Many products use Wi-Fi to connect to the internet and Moddable has worked with many clients to successfully deliver products that use Wi-Fi. Testing these products can be tedious, walking back and forth to the closet to power off the Wi-Fi router to verify that the product gracefully recovers. We’ve long thought there must be a better way. A recent client project gave us the chance to try. … Read More

Going Deep with XS: deepEqual and structuredClone

August 22, 2022 | Peter Hoddie, Principal

Comparing and copying JavaScript objects are fundamental operations that are remarkably complex to implement correctly and efficiently. Because these operations are not built into the JavaScript language, various solutions have arisen to make life easier for developers. Web browsers provide the structuredClone function to make a deep copy of an object. Node.js provides deepEqual assertions to perform deep comparison of objects and the is-equal module provides a faster implementation as an npm module. Embedded developers who need these operations have had to create their own ad-hoc solutions. Until now. … Read More

LittleFS – the Best File System for Embedded Projects?

August 12, 2022 | Peter Hoddie, Principal

Microcontrollers don’t usually have a built-in file system. Projects that need a file system have a choice of which file system to use. Popular choices include the FAT file system and SPIFFS, and the Moddable SDK supports both. These file systems work well, but have limitations that make them difficult for developers to work with, especially developers more familiar with the full featured file systems on computers. The LittleFS file system created by ARM is an excellent alternative to both SPIFFS and FAT, that is also easier for developers to use. LittleFS is now fully supported in the Moddable SDK. … Read More

How We Test XS and the Moddable SDK

June 28, 2022 | Peter Hoddie, Principal

Making sure that the Moddable SDK and the XS JavaScript engine run correctly and reliably is a big project. There are hundreds of features and APIs that must be verified on a wide variety of devices. Testing on devices is particularly challenging, as many don't even have enough storage space to hold the test suite. Moddable has developed a technique to test both our JavaScript engine and our APIs that works on many embedded devices and our desktop simulator platforms. … Read More

Building BLE Keyboards & Media Controllers with the Moddable SDK

March 9, 2022 | Andy Carle, Product & Prototype Engineer

With just a little software, you can quickly turn an inexpensive microcontroller into a powerful custom remote control for many of the devices you already own. Devices like televisions, media players, mobile phones, and computers support external keyboards and remote controls connected using Bluetooth Low Energy (BLE). Many microcontrollers, including the ESP32 found in Moddable… Read More

Scalable Outlines: New Flexibility for Embedded UX

February 21, 2022 | Peter Hoddie, Principal

Delivering a modern user experience on low-cost embedded hardware has been a key focus of the Moddable SDK from the start. The Moddable SDK is regularly updated with new rendering capabilities to expand the kinds of user experiences that can be created. Last year support for animated GIFs arrived and earlier this year it got… Read More

Using More Fonts More Easily in IoT Products

January 14, 2022 | Peter Hoddie, Principal

The fonts displayed on the screen of an IoT product are a key part of its brand, establishing the overall feel of the product. All of Moddable’s commercial clients use the custom font support in the Moddable SDK to brand their products. While it has always been possible to incorporate custom fonts into products, it… Read More

Best Practices for Accessing Memory Buffers from Native Code with the XS JavaScript Engine

November 22, 2021 | Peter Hoddie, Principal

JavaScript applications for embedded systems frequently work with memory buffers to perform a wide variety of tasks. Scripts gain tremendous power by being able to operate directly on the native data of the classes they use. The XS JavaScript engine at the core of the Moddable SDK contains extensive support for working with memory buffers.… Read More

The Case for Ethernet

November 16, 2021 | Lizzie Prader, Software Engineer

Over the past few months, Moddable has developed products for clients in the manufacturing and automotive industries. One client is building a monitoring system for factories; the other, a system to detect maintenance issues in cars. To my surprise, both clients asked us to support Ethernet in these projects. As it turns out, people still… Read More

Getting the Most from ePaper Displays

November 8, 2021 | Peter Hoddie, Principal

One of the defining features of the Moddable SDK is its outstanding support for displays in IoT products. Much of that work has focused on LCD touch screens, but ePaper displays have also been supported from the beginning. Recent work has brought broader and deeper support for ePaper displays, making the Moddable SDK the best… Read More

GIPHY Goes to ESP32

July 14, 2021 | Lizzie Prader, Software Engineer

The latest addition to the Moddable SDK is a delightfully silly example app to display animated GIFs from the popular GIPHY web site. The app lets the user enter a search term, uses GIPHY’s REST API to search for a GIF, downloads it, and then displays the GIF onscreen in a continuous loop. Despite the… Read More

Bringing the Moddable SDK (and modern JavaScript) to the Raspberry Pi Pico

February 19, 2021 | Peter Hoddie, Principal

Today Moddable is launching a public effort to bring the Moddable SDK to the Raspberry Pi Pico development board. The Moddable SDK includes XS, the only modern JavaScript engine designed for resource constrained microcontrollers. The Pico is powered by the new RP2040 microcontroller (MCU) from the same organization that created the Raspberry Pi family of… Read More

Moddable SDK moves to ESP‑IDF 4.2. Brings modern JavaScript to ESP32‑S2 powered Kaluga and Saola boards

February 5, 2021 | Peter Hoddie, Principal

Note: This blog post was originally posted on January 5, 2021 to introduce the developer preview of ESP-IDF 4.2 support in the Moddable SDK. That development work was merged to the main Moddable SDK repository on February 2, 2021. The blog post has been updated to reflect that. The Moddable SDK has migrated to using… Read More

Animations on a Display Powered by a $1 Wi-Fi Controller

December 10, 2020 | Lizzie Prader, Software Engineer

If you walk by the Moddable office in downtown Palo Alto, you’ll see a collection of eye-catching screens in the window. The latest to be added is a Moddable One displaying a series of animations. If you can’t make it by the office, you can see the animations in this video. To a casual observer,… Read More

Interviewing IoT Experts on Sensor Metadata

September 10, 2020 | Josué Kpodo

Difficult as it is to believe, we have reached the end of the summer and the end of Josué Kpodo’s time with us as an intern. In this post, Josué provides a final update on his work gathering user needs and prior art to inform the creation of the TC53 Sensor Data Provenance Specification draft.… Read More

(Very Experimental) TypeScript Support in the Moddable SDK

August 5, 2020 | Peter Hoddie, Principal

Moddable believes JavaScript is the best language for building IoT products. We’ve heard from many developers that they agree with us, but that it is important to them to be able to use TypeScript. If you aren’t familiar with TypeScript, it is a language created by Microsoft that adds features to JavaScript focused on type… Read More

Josué Kpodo: Moddable Summer Intern

July 21, 2020 | Josué Kpodo

It is my pleasure to introduce this blog post written by Josué Kpodo, who has joined the Moddable team for the summer as an intern. Josué comes to us from Michigan State University where he recently completed his undergraduate degree in Computer Science. In this post, Josué will share a bit about his background and… Read More

A Color Picker for Microcontrollers

July 15, 2020 | Lizzie Prader, Software Engineer

The color wheel is a common user interface element in desktop and mobile apps that allows the user to select a color. User interfaces to select a color are rare on displays powered by embedded microcontrollers. When present, the interface is primitive, perhaps an array of color boxes. The color-picker example implements a true color… Read More

Moddable SDK Improvements for ESP32 Projects

April 15, 2020 | Andy Carle, Product & Prototype Engineer

Today, we released a major update to improve our support for the popular ESP32 microcontroller. This update includes four major new features: Faster, more reliable ESP32 build system Upgrade to ESP-IDF v3.3.2, a Long Term Support release from Espressif Lightweight NimBLE Bluetooth LE stack for ESP32 Execution of individual build steps — clean, build, deploy,… Read More

HACKberry Bionic Hand

March 23, 2020 | Lizzie Prader, Software Engineer

HACKberry is a 3D-printable bionic arm project managed by Mission ARM Japan. The goal of HACKberry is to make inexpensive prosthetics more widely available by significantly reducing the cost. The HACKberry arm is also remarkably customizable for users because both the hardware and software are open source. Naturally, we at Moddable were very interested when… Read More

XS Engine Updates for ECMAScript 2020

March 17, 2020 | Peter Hoddie, Principal

The XS JavaScript engine brings the many benefits of modern JavaScript to embedded systems like those that power IoT products. The latest release of XS is a major step forward. It delivers new language features, performance optimizations, improved conformance with the ECMAScript specification, and updated support for the Secure ECMAScript proposal. This blog post summarizes… Read More

Scripts & Things Recap: November 2019

December 5, 2019 | Lizzie Prader, Software Engineer

This Wednesday, we wrapped up year two of Scripts & Things, our meetup on JavaScript development for the microcontrollers and embedded systems that make up the Internet of Things. We concluded 2019 with a demo night featuring a variety of great demos from Scripts & Things members. Each of the projects presented at the meetup… Read More

XS Update

November 14, 2019 | Peter Hoddie, Principal

The latest update to the XS JavaScript engine continues to focus on adapting and optimizing JavaScript for embedded systems. In this release, the majority of these improvements take place during the preload phase, part of the build process. Additionally, this release adds support for top-level await and WeakRef, two new JavaScript features expected to be… Read More

Faster Flash

October 4, 2019 | Peter Hoddie, Principal

This blog post is about performance improvements in the way the Moddable SDK reads SPI flash. That might not sound exciting, but the result is: our favorite rendering benchmark (balls) runs 50% faster. When you update to the latest Moddable SDK, you’ll get those changes automatically. The details behind the improvements are an interesting window… Read More

Firmata Remote Device Control in the Moddable SDK

August 6, 2019 | Peter Hoddie, Principal

Firmata is a popular protocol for controlling remote hardware resources. It is often used to allow a more powerful device running a non-real time operating system, such as Linux, to control the hardware ports of a less powerful microcontroller device with a real-time operating system (or no operating system at all). The most common use… Read More

XS: Secure, Private JavaScript for Embedded IoT

July 19, 2019 | Peter Hoddie, Principal

The latest release of our XS JavaScript engine puts in place fundamental new capabilities to advance Moddable’s mission of safely opening IoT products to third party software. These new capabilities are implementations of proposals on track for standardization in Ecma TC39, the JavaScript language committee. The two most significant developments are described in the “Truly… Read More

Clock Project

July 12, 2019 | Michael Kellner, Embedded Engineer

This article describes my work to build a classic LED style clock using the Moddable SDK. That might surprise you because a key feature of the Moddable SDK is the ability to add interactive, animated touch screens to IoT products. An IoT product that incorporates a well designed touchscreen interface is a joy to use.… Read More

Introducing an Expanding Keyboard for Small Screens

July 4, 2019 | Brian Friedkin, Principal Engineer

Introduction Text entry on small IoT device screens can be frustrating to use because when a touch keyboard designed for mobile devices is shrunk down to fit on a small screen, accurate typing becomes too difficult. That makes entering a Wi-Fi password, for example, an unpleasant and challenging experience. In this article we introduce our… Read More

Hacking the Sonoff B1 Lightbulb

May 25, 2019 | Peter Hoddie, Principal

At Moddable, we believe individuals should have control of the software in the products they own. Some people will use that control to write their own software, while others will use that control to choose the software that delivers the behaviors and privacy they design. Moddable’s extensive work in JavaScript contributes to that goal by… Read More

Run-time Display Rotation

April 9, 2019 | Peter Hoddie, Principal

The Moddable SDK now supports rotating the image shown on displays using features built into some display controllers. This allows the display to be rotated to 0, 90, 180, and 270 degrees at any time with no added overhead. Build-time Rotation with Software The Moddable SDK has always included support for drawing to displays at… Read More

Qualcomm QCA4020 Now Supported by Moddable SDK

April 4, 2019 | Brian Friedkin, Principal Engineer

The Qualcomm QCA4020 is a low-power, ARM-based dual-core SoC with integrated Wi-Fi and Bluetooth, for communication with IoT devices and cloud services. The Moddable SDK provides modern tools and technologies to developers for building applications on resource constrained microcontrollers. Today we are pleased to announce Moddable SDK support for the Qualcomm QCA4020, bringing modern, efficient,… Read More

ECMAScript 2019 comes to XS

March 11, 2019 | Peter Hoddie, Principal

The latest push of the XS JavaScript engine implements support for the forthcoming ECMAScript 2019 standard. The ECMAScript 2019 standard includes several new capabilities and refinements but no major new features. A complete summary of the changes with links to details is available on the “2ality – JavaScript and more” blog by Axel Rauschmayer. For… Read More

BigInt on Tiny Hardware with XS

January 29, 2019 | Peter Hoddie, Principal

The JavaScript language is preparing to add built-in support for integers of arbitrary size with a new feature named BigInt. The built-in Number type is accurate to 53-bits of precision, which is insufficient for many tasks. By standardizing BigInt into the language, developers benefit from having a single API available in all environments and JavaScript… Read More

Pushing PNG Images to a Display

January 16, 2019 | Peter Hoddie, Principal

Sometimes a display is just a display. You don’t need an interactive user interface, you just need to show an image. Using the Moddable SDK, this is easy to do by building a small application to draw the image. There are examples to display a PNG, an animated GIF, and to stream JPEG images from… Read More

A Very NeoPixel Christmas

December 21, 2018 | Michael Kellner, Embedded Engineer

The Christmas season brings decorations and lights. My neighborhood has an assortment of fixed multi-color incandescent and LED lights. Then there is one house with a big light show, complete with low-power FM transmission of a soundtrack to sync with the lights. While I don’t want to invest the time and expense in setting up… Read More

Scripts & Things Recap: 12/5/2018

December 7, 2018 | Andy Carle, Product & Prototype Engineer

This Wednesday, we wrapped up year one of Scripts & Things, our meetup on JavaScript development for the microcontrollers and embedded systems that make up the Internet of Things. We concluded 2018 with lively discussions before, during, and after a series of demos. A big thank you to everyone who joined in the fun —… Read More

Building an Apple Media Service Client with the Moddable SDK

December 1, 2018 | Brian Friedkin, Principal Engineer

iOS devices from Apple provide BLE services for accessories to enhance user experience and interactions. The Apple Media Service (AMS) allows accessories to interact with the iOS media player. We thought it would be fun to build an ESP32 color touch screen interactive media player accessory to control the iPhone media player. We built it… Read More

Improving IoT interoperability with Decentralized Ambient Synchronization over mDNS

October 12, 2018 | Lizzie Prader, Software Engineer

At Moddable we believe IoT products should be open and customizable by the end user. The current lack of standards for interoperability means that there are too many IoT products that connect to only one cloud service or interoperate only with other products from the same company. The Web of Things community is working to… Read More

Working with Mozilla’s Project Things

October 3, 2018 | Lizzie Prader, Software Engineer

IMPORTANT: Web Thing API support in the Moddable SDK is deprecated as of August 28, 2019. One of the issues that plagues IoT is the lack of standards for interoperability. There are too many IoT products that connect to only one cloud service or interoperate only with other products from the same company. At Moddable… Read More

Moddable SDK Updates

October 2, 2018 | Peter Hoddie, Principal

There’s been a lot of good work in the Moddable SDK in recent months. This blog post highlights a some of the recent additions and improvements. mDNS The mDNS protocol is arguably the most robust solution available for IoT devices connected to the same local network to discover one another. It is a mature technology… Read More

Scripts & Things Recap: 9/19/18

September 21, 2018 | Lizzie Prader, Software Engineer

Earlier this week Moddable hosted the second meeting of Scripts & Things, our meetup about embedded software development using JavaScript on microcontrollers and other embedded systems. We were pleased to have a diverse group of web developers, embedded developers, and even some brand new programmers join us and get excited about JavaScript for embedded. Demos… Read More

Scripts & Things Recap: 8/22/2018

August 27, 2018 | Andy Carle, Product & Prototype Engineer

Last week we hosted the first edition of Scripts & Things, our meetup about embedded software development using JavaScript on microcontrollers and other embedded systems. The event was enjoyed by all in attendance and will serve as a launching pad for future meetups in the series. Presentations Our goal with Scripts & Things is to… Read More

NeoPixels, Moddable style

August 22, 2018 | Peter Hoddie, Principal

NeoPixels are strings of bright LEDs that have been popular within the maker community for adding animated illumination to objects. Several recent ESP32 based development boards have built-in NeoPixels, including the … Read More

Sketching in Hardware 2018

August 7, 2018 | Andy Carle, Product & Prototype Engineer

Last weekend, I attended Sketching in Hardware 2018 in Detroit, Michigan. Sketching is a small conference that brings together: builders of tools that assist consumer electronics developers and Makers, high-profile users of those tools (or educators of future users), well-known academics who run research programs on development tools, digital fabrication, or IoT ecosystems. I have… Read More

Scripts & Things

July 26, 2018 | Andy Carle, Product & Prototype Engineer

The Moddable team is starting a Meetup about embedded software development using JavaScript on microcontrollers and other embedded systems. The group is called Scripts & Things and our first gathering will be on August 22nd at the Moddable office in downtown Palo Alto. We chose the name Scripts & Things because the Meetup focuses on… Read More

Developing with the Moddable SDK on Windows

June 26, 2018 | Brian Friedkin, Principal Engineer

Windows is the development platform used by embedded software developers simply because many semiconductor companies only provide their development and debugging tools for Windows. Many large companies require their employees to use a common operating system and, more often than not, that platform is Windows. And, of course, many software engineers simply prefer to do… Read More

Compiling JavaScript on Embedded Devices

June 19, 2018 | Peter Hoddie, Principal

We’ve recently enabled the JavaScript eval function on embedded devices using the XS JavaScript engine. Our long-held position is unchanged: it is almost always a bad idea to compile JavaScript on an embedded device. The reasons that eval are used on the web, for example, do not typically apply to embedded development. Still, compiling scripts… Read More

Web Services Series Part 3: Building Custom Modules to Replace JavaScript Libraries for the Web

June 13, 2018 | Lizzie Prader, Software Engineer

There are countless JavaScript libraries available for the web. Since the XS JavaScript engine in the Moddable SDK implements the same JavaScript language used in web browsers, it seems reasonable to assume these libraries may also be used on embedded devices. We often get the question, “can I use [insert name of web JavaScript library… Read More

Bluetooth Low Energy Support Now Available in Moddable SDK

June 1, 2018 | Brian Friedkin, Principal Engineer

We are pleased to announce Bluetooth Low Energy (BLE) protocol support in the Moddable SDK, enabling both BLE peripheral and central device development. BLE is available now on Espressif ESP32 and Silicon Labs Blue Gecko microcontrollers. This article describes the BLE features supported. It includes BLE example code in JavaScript. If you are not familiar… Read More

Web Services Series Part 2: Making Secure Network Requests

May 31, 2018 | Lizzie Prader, Software Engineer

The first article of this series describes how to issue HTTP requests in applications built with the Moddable SDK using information from REST APIs. This article builds on the concepts from the first article and explains how to use the Moddable SDK’s TLS stack in applications to make HTTPS requests. What is TLS? Transport Layer… Read More

Maker Faire Bay Area 2018

May 29, 2018 | Lizzie Prader, Software Engineer

The Moddable team recently exhibited and presented at Maker Faire Bay Area. Exhibit and Demos We had a booth in the Expo Hall, surrounded by other tech companies, makers, and artists. No Maker Faire booth is complete without demos or a hands-on activity. We brought demos focused on three things: scripts, screens, and apps for… Read More

Silicon Labs Gecko support in Moddable SDK

May 7, 2018 | Michael Kellner, Embedded Engineer

The Moddable SDK helps developers build applications for low cost, constrained microcontrollers. Last spring, we embarked on a project to use a processor from Silicon Labs to prototype a low cost, low power IoT device that includes proprietary radio communication. The Silicon Labs line of Energy-Friendly MCUs are very efficient in their use of power,… Read More

Web Services Series Part 1: Working with REST APIs

April 30, 2018 | Lizzie Prader, Software Engineer

The Moddable SDK includes modules that implement a variety of networking protocols, giving developers the flexibility to build applications that interact with all sorts of other devices and cloud services. A common way to communicate with cloud services is through RESTful APIs, which are based on HTTP. You can find several basic example apps… Read More

QR Code module for the Moddable SDK

April 19, 2018 | Peter Hoddie, Principal

In recent months, Moddable has received inquiries for the ability to render a QR Code in the Moddable SDK. This article describes the module we created to support QR Code rendering, together with some of the design and implementation choices we made along the way to provide efficient and flexible QR Code support. What’s a… Read More

Moddable Tech Presentation to TC-39

April 4, 2018 | Peter Hoddie, Principal

In May of 2017, Moddable Tech presented our XS JavaScript engine to at the Ecma TC-39 meeting at Google New York. We were graciously invited by Brendan Eich, the creator of JavaScript, to share our work applying JavaScript to extremely resource constrained embedded hardware. Brendan believed it would be valuable for the committee to see… Read More

Cost effective displays for digital products

February 6, 2018 | Peter Hoddie, Principal

Moddable is working hard to make it much easier to add displays to consumer electronics products. A display shows more information quickly and concisely than a few blinking lights or a voice interface. But, it is challenging today to build a product with a display at a reasonable cost with a modern user interface. One… Read More

Significant updates to Moddable SDK

January 18, 2018 | Peter Hoddie, Principal

The most recent push to the Moddable repository on GitHub is a big one. It includes the following:

New regular expression engine — A completely new regular expression engine written from scratch for use by XS, Moddable’s JavaScript engine. It is almost 10x smaller than its predecessor with more features and improved conformance. We believe… Read More

A smaller, more compatible regular expression engine for XS

January 18, 2018 | Peter Hoddie, Principal

Introduction The JavaScript language includes support for regular expressions, a compact and powerful tool to perform search and replace operations on strings. Regular expressions can be considered a separate language within JavaScript, with its own syntax and behaviors. Just as implementing a JavaScript engine is a major undertaking, properly implementing a new regular expression engine… Read More

Welcome to the Moddable Blog

January 16, 2018 | Lizzie Prader, Software Engineer

The Moddable team is using this blog to share news about what we’re up to. Much of the content will have technical details about embedded development with JavaScript, including information about features of the Moddable SDK, descriptions of interesting projects, and tips for app developers. Other posts will be discussions of our mission to open… Read More