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NEW PRODUCT – Espruino MDBT42Q Breakout

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NEW PRODUCT – Espruino MDBT42Q Breakout


Try the JavaScript of things with the Espruino – the world’s first open-source JavaScript microcontroller! This little board has an nRF52832 microcontroller pre-programmed with Espruino all ready to go so you can start playing with Javascript-microcontrollers. Warning: if you only use Assembly and think that even embedded C/C++ is for wimps, this device might explody your head.

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The Espruino is a tiny computer with a JavaScript interpreter, allowing for instant feedback from whatever device you’re working with. Simply set up your code with the Espruino and send it to the device without having to wait for the board to erase and reprogram the flash – it’s fully interpretted!

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The Espruino’s fast response time has a lot of advantages. It allows for quick and easy debugging and is a great way to test your project before your big reveal. This module is a miniature, embeddable version of the Pixl.js – it just contains the Espruino-running Bluetooth LE module, regulator and reset button. In addition, you can control the Espruino from almost anything that has Bluetooth Low Energy.

Each order comes with the Open Source JavaScript interpreter Espruino pre-installed, which makes it incredibly easy to use and means you can get started in just seconds, without any prior programming experience. You can start programming straight out of the box using WebBluetooth for an IDE!

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Breakout board features

  • Bluetooth Low Energy
  • Espruino JavaScript interpreter pre-installed
  • nRF52832 SoC – 64MHz ARM Cortex M4, 64kB RAM, 512kB Flash
  • 22 x GPIO (capable of PWM, SPI, I2C, UART), including 7 analog inputs – 0.1″ pin header
  • 2.5 – 16v voltage input, 20uA power draw when advertising
  • Red and Green LEDs
  • Button
  • Built in thermometer
  • NFC tag programmable from JavaScript (when an antenna is connected)

Some light soldering is required to power this small breakout. It isn’t the easiest Espruino to start with, but when you need to go small, this one is as tiny as it gets.

For other great embedded Javascript development boards from Espruino, check out the classic Espruino and the little Espruino Pico.

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In stock and shipping now!


Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.

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