The Original Espruino is development board that runs JavaScript code (it doesn't need to be plugged into a computer). You can program it with nothing but a serial terminal program, but there's also an IDE that runs in the Chrome Web browser. It's got a syntax highlighted editor as well as a graphical programming language.

Once you've uploaded code, you can inspect and change variables (including functions!) while your program is running.

There's loads of documentation, tutorials and support for a huge range of different hardware too.

See how to get started here, or if you have any questions ask away on our forums!

Why did you make it?

I was amazed at how difficult it was to get started with (and then to debug) most Microcontrollers (especially ARMs), and the lack of support for different platforms. I thought that by putting the development tools on the device itself I could come up with a microcontroller board that could be programmed easily from almost any kind of computer.

Not only that, but your source code is on the board itself. If you make something with an Espruino board and need to change it a year later, your original code is still there waiting for you!

Specifications

• Less than half the size of a business card ( 54mm x 41mm )
• STM32F103RCT6 32-bit 72MHz ARM Cortex M3 CPU
• 256KB of Flash memory, 48KB of RAM
• Micro USB connector
• Input Voltage Range of 3.6v to 15v
• Battery connector (JST PHR-2 2 Pin)
• Built-in SD card connector
• Red, Green and Blue LEDs
• Pads to allow HC-05 Bluetooth modules to be added
• 0.1" Pin spacing
• 44 GPIO Pins, capable of: 26 PWM Pins, 16 ADC Pins, 3 USARTs, 2 SPI, 2 I2C and 2 DACs
• Prototype area which can be used in many different configurations, for example: Servo Headers, Up to 14x 500mA outputs, 2x .NET Gadgeteer connectors, or NRF24L01+ wireless transceiver modules

You might also want to check out the smaller Espruino Pico - available pinned or unpinned

Note: while prices are in USD, Puck.js devices are shipped from England. If you live in the UK, VAT is included in the price you pay. If not, you may be liable to pay your country's import tax when you receive the package.