Adafruit Espruino MDBT42Q Breakout

Adafruit Espruino MDBT42Q Breakout is a Bluetooth-enabled, open-source, JavaScript-based module, mounted on a easily soldered board. The MDBT42Q Breakout features a Nordic Semiconductor nRF52 Series SoC (System on Chip), pre-programmed with Espruino, an open-source JavaScript interpreter for multiplatform microcontroller development. The integrated Espruino Module includes Bluetooth Low Energy (BLE), 64k of RAM, and 512k of Flash in a compact, low-power package. The MDBT42Q Breakout Board's 0.1" pin header offers 22 GPIO (capable of PWM, SPI, I2C, UART), with 7 analog inputs.


  • Nordic Semiconductor nRF52832
    • 64MHz Arm Cortex M4
    • 64kB RAM; 512kB Flash
    • Bluetooth Low Energy
    • Espruino JavaScript interpreter pre-installed
  • 0.1" pin header
    • 22x GPIO (PWM, SPI, I2C, UART), including 7 analog inputs
  • Voltage input: 2.5V to 16V; 20uA power draw when advertising
  • Red and Green LEDs
  • Button
  • Integrated temperature sensor
  • NFC tag programmable from JavaScript (when an antenna is connected)
  • Dimensions: 18mm x 28mm x 4mm


Pin Designations

Adafruit Espruino MDBT42Q Breakout
Published: 2018-09-10 | Updated: 2022-10-03