The Espruino MDBT42Q Breakout is a compact Bluetooth Low Energy development board running the Espruino JavaScript interpreter. Built around the nRF52832 SoC, it lets you write and deploy JavaScript code to a microcontroller instantly — no compilation or flash-erase cycles needed. Code is fully interpreted and can be uploaded wirelessly via Web Bluetooth.

This is a miniature, embeddable version of the Espruino platform, containing just the BLE module, voltage regulator, and reset button. Some light soldering is required to power it.

Key Features

• Espruino JavaScript Interpreter – Pre-installed, ready to program out of the box
• nRF52832 SoC – 64 MHz ARM Cortex-M4, 64 KB RAM, 512 KB flash
• Bluetooth Low Energy – Program wirelessly via Web Bluetooth IDE
• 22 GPIO Pins – PWM, SPI, I²C, UART capable, including 7 analogue inputs (0.1″ header)
• Wide Voltage Input – 2.5–16 V
• Ultra-Low Power – 20 µA when advertising via BLE
• NFC Tag – Programmable from JavaScript (requires external antenna)
• On-Board Peripherals – Red and green LEDs, button, built-in thermometer

Specifications

• Processor – nRF52832, ARM Cortex-M4, 64 MHz
• RAM – 64 KB
• Flash – 512 KB
• GPIO – 22 pins (0.1″ pitch)
• Input Voltage – 2.5–16 V
• BLE Advertising Current – 20 µA

Ideal For

• Rapid prototyping with JavaScript
• Bluetooth Low Energy IoT projects
• Embedded applications requiring a tiny form factor
• Beginners wanting instant-feedback programming

Package Contents

• 1× Espruino MDBT42Q Breakout Board

Resources

• Quick Start Guide (Espruino)