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This board has the same Bluetooth LE module that we use on Puck.js and Pixl.js, pre-programmed with Espruino. Just apply power, connect with Bluetooth LE or Serial and start writing JavaScript!

We sell pre-programmed bare modules, but this is a board with 0.1" pins, a voltage regulator, 2 LEDs and a button. It's thin, small, and very power efficient.


  • Bluetooth Low Energy
  • Espruino JavaScript interpreter pre-installed
  • nRF52832 SoC - 64MHz ARM Cortex M4, 64kB RAM, 512kB Flash
  • 22 GPIO (capable of PWM, SPI, I2C, UART) on 0.1" pitch, including 7 analog inputs
  • Built in thermometer
  • NFC tag programmable from JavaScript (when antenna added)
  • 2.5v  - 16v input voltage range, drawing ~20uA while advertising.
  • Powerful (250mA, 500mA peak) MCP1703T 3.3v voltage regulator, capable of powering an ESP8266
  • Dimensions: 18mm x 28mm x 4mm thick
  • Click here for full technical information
Inputs Button, Temperature
Outputs Red & Green LED, Programmable NFC tag
GPIO (0.1") 22
RAM (kB) 64
Flash (kB) 512
Clockspeed (MHz) 64

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MDBT42Q Breakout

  • Brands Espruino
  • Product Code: MDBT42_BREAKOUT
  • Availability: 554
  • £20.00

  • Ex Tax: £16.67

  • 2 or more £19.20
  • 10 or more £17.60
  • 20 or more £16.00
  • 50 or more £15.19
  • 100 or more £14.40

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Tags: Espruino, MDBT42Q, BLE, Bluetooth LE