Library for Arduino and ATmega series processors to read the processor's Vcc voltage and percentage of capacity (for battery based projects) using *absolutely* no external components or connections!

ESP32-S3 e-ink weather station

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

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

Energy-aware power management and battery-life estimation library for Arduino IoT projects.Arduino ESP32 AVR SAMD IoT battery-life power management BLE GPS LoRa energy harvesting

Pointless Button Hardware Version 2

Battery-powered ESP32-S3 gateway for 4 SDI-12 soil sensors. Deep sleep (1h cycles, ~10μA), MOSFET power switching, individual level-shifted data lines. Precision agriculture and environmental monitoring.

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

Ultra-low-power multi-color e-paper photo frame on a 2.5 KB-SRAM ATmega32U4. ~4 months autonomy on a recycled Nokia battery.

Battery-powered bicycle acquisition module using camera, dual 360° Lidar, and GNSS with ROS2 on Raspberry Pi to detect overtaking vehicles and measure curb distance.

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

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.

Battery-powered e-ink dashboard for Home Assistant — weather, calendar, sensors — built with ESPHome on LOLIN S3 Pro + Waveshare 7.5" e-Paper

DIY portable 2-in-1 soldering iron and power supply station with custom circuit design and 3D-printed enclosure.

A compact BLE smart tracker that helps quickly locate misplaced vehicle keys.

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

Project made to learn electronics and ESP32 programming. A self-contained device with OLED display and all parts in an enclosure. The screen shows temperature, humidity and pressure from Home Assistant via MQTT. DS18B20 measures internal temp; a fan is driven by ESP32 with N-MOSFET and hysteresis to prevent overheating.

Portable Workbench Power Supply with Adjustable Output (1.25V–10V), USB Output, and Battery Backup for DIY Electronics Testing

A lightning detector that runs on a battery and fits in your pocket. It records the distance, energy and current time of a lightning strike, and you can then view this data via Bluetooth in mobile app. The time is synchronized via Bluetooth.

Universal Arduino based data logger to SDcard.