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

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

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

Ultralightweight battery-powered thermometer using ESP32 and MQTT with home assistant integration.

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.

Pointless Button Hardware Version 2

Official repository of the S-NODE-1 IoT project, a solar powered environmental sensor. The repository contains firmware, software and HW files of the project.

Battery powered Orange Pi Zero for Pentesting Wireless Networks

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.

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

Experiments with making little earring PCBs with LEDs and a small battery

Sigfox temperature & humidity sensor

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

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

Universal Arduino based data logger to SDcard.