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!

LoRaWAN beehive monitor: hive weight, temperature and battery over TTN. Seeed XIAO nRF54LM20A + SX1262, Zephyr/nRF Connect SDK. ~4 uA sleep, ~9 year life on one AA cell. Includes KiCad hardware and a Web Bluetooth config app.

ESP32-S3 e-ink weather station

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

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

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

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

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.

🐕📦 Batteriebetriebener Öffnungsmelder für Paketboxen auf ESP32-C6-Basis. Bis zu 4 unabhängige Eingänge, Deep Sleep im µA-Bereich, Push via Telegram/Pushover/ntfy oder MQTT mit Home-Assistant-Autodiscovery. Komplette Konfiguration per WebUI, Firmware-Flash direkt aus dem Browser.

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.

Low-power ESPHome firmware for the Seeed XIAO ESP32-C6 soil moisture sensor. ~600 days on one AA cell, measured.

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

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

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

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.

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