Adafruit Espruino Puck.js v2

The Espruino Puck.js v2 is a compact, low-energy Bluetooth smart button programmable with JavaScript. It boasts a custom circuit board and the latest Nordic chip, offering Bluetooth LE, NFC, a magnetometer, a temperature sensor, RGB LEDs, and infrared features, all packed in a tiny silicone case.

Benefits include wireless programming and debugging, thanks to the pre-installed Open Source JavaScript interpreter, enabling quick setup with no additional software or cables. Its low power consumption ensures prolonged battery life compared to more complex boards.

Specifications highlight an nRF52832 Bluetooth Low Energy SoC (Cortex M4, 64kB RAM, 512kB Flash), multiple GPIOs capable of PWM, SPI, I2C, UART, and analog input, as well as a 200ma FET output. Sensors include a LIS3MDLTR Magnetometer, LSM6DS3TR-C Accelerometer/Gyro, and a PCT2075TP Temperature sensor.

Use cases are expansive, from controlling NeoPixels through Espruino's API to developing custom applications with tutorials and code examples readily available. The Espruino Puck.js v2 is ideal for inventors who value instant execution and long-lasting battery performance.