Pointless Button Hardware Version 2

Ultra-Low Power Single push button ON/OFF controller based on ATTiny13/13A/25/45/85 for other microController and circuits application

Arduino compatible low consumption battery powered device with uSD slot and real time clock

Time Watcher, Timer, Stopwatch on ESP8266 WeMos with display shield

DitroniX GTIE ESP8266 ADC GTIL CH340 OPTO CT Current Clamp Battery Powered Energy Monitor GTIL2

Battery-powered wildlife camera based on the ESP32-CAM board

Firmware for a battery powered Feather M0 LoRaWAN particular matter sensor (BME280, SDS011)

A wireless, battery-powered recording light or "do not disturb" light. The light is controlled with two buttons on a webpage. To save power, the MCU enters deep-sleep after 11 hours, for 13 hours.

A lightmeter for an analog camera powered by a Infenion XMC2GO board. Features 5 buttons, OLED screen with reading and a VEML7700 light meter IC. Powered with a LIR2032 Li-ion cell.

Battery-powered Wi-Fi Repeater based on the ESP8266 board, than can be used to extend a Wi-Fi Network range in areas where it could be difficult to use standard Wi-Fi repeaters