Espruino

Espruino was created by Gordon Williams in 2012 as an attempt to make microcontroller development truly multiplatform.[2][3] Though initially not open-source, the Espruino firmware was offered as a free download for STM32 microcontrollers.[4] It was made open-source in 2013 after a successful Kickstarter campaign[5] for a development board running the software.[6] Since the original Espruino board, there have been a number of new official development boards including the small USB thumb-drive-sized Espruino Pico,[7] the Wifi-equipped Espruino WiFi, the Puck.js with built-in Bluetooth and the Pixl.js[8] with a built-in LC display and Arduino shield compatibility. In addition to the official boards, Espruino runs on approximately 40 other types of development boards[9][3] including the ESP8266.[10][11]

There is a large body of reference material for Espruino including over 100 tutorials[12] as well as the book Making Things Smart[13] which contains a selection of hardware projects that can be created with Espruino-based microcontrollers.

To achieve maximal memory efficiency, Espruino executes code from source directly inside the parser, without the use of an Abstract Syntax Tree or intermediate bytecode.[14]

The Original Espruino, the first official development board, offers 44 GPIO pins, Micro SD card support, a Micro USB interface and controllable LEDs and buttons. It has 256 KB of flash and 48 KB of RAM and runs on a 72 MHz ARM Cortex M3 processor.

The first official development board was the Original Espruino. Later boards are available in a variety of form factors. The Original Espruino was followed by the Espruino Pico, Espruino WiFi, Puck.js and Pixl.js. A breakout board featuring the MDBT42Q Bluetooth LE module, the same used in the Puck.js and Pixl.js, is also available.

• Official Espruino development boards
• 
  Original Espruino
• 
  Espruino Pico
• 
  Espruino WiFi
• 
  Espruino Puck.js
• 
  Espruino Pixl.js
• 
  Espruino MDBT42Q Breakout

Espruino Web-Based IDE

Screenshot of Espruino web-based IDE running in Google Chrome
Developer(s)	Gordon Williams
Repository	github.com/espruino/EspruinoWebIDE
License	Apache License 2.0
Website	www.espruino.com/ide/

Espruino programs are written using JavaScript. The Espruino IDE is available as a web-based app, a Google Chrome App and as a native Windows application.[15] Alternative methods of programming Espruino boards include using terminal programs such as PuTTY on Windows.[16]

All of Espruino is Open Source. The different parts are licensed as follows:

• Espruino Firmware - Mozilla Public License, version 2.0[17]
• Espruino Code Samples - MIT License[18]
• Espruino Documentation - Creative Commons Attribution-ShareAlike 3.0[18]
• Espruino Hardware Design Files - Creative Commons Attribution-ShareAlike 3.0[19]