Simple low-power geiger counter with Arduino

Constant current circuit to test 18650 batteries

bat_vision

Evolv DNA 75 c themes and configs

Arduino UNO + A4988 + HM-10 Bluetooth + 42HB4004 Stepper + MIT App Inventor test version

Electro-mechanical design for a USB spaker

Low power consumption for TTGO t-beam

Battery management system for your FPV goggles.

Smart BMS Data Monitoring

If you have a private powerwall of 18650 cells, this is the battery management system you need. The small PCB is equipped with the cheap Arduino Nano.

Project to implement home made powerwall based on 6 battery packs each with 7S 9P configuration.

Plant watering system based on Arduino Nano, real time clock (RTC DS3231) and 12V water pump.

To test 18650 batteries with the help of WIFI based microcontroller

Infrared thermometer with a laser pointer built with an ESP8266 microcontroller and an MLX90614 sensor.

Capacity and internal resistance meter for lithium(18650) and other type batteries

Reverse Protected 18650 Lithium-Ion Charging Unit

Environment sensor that is powered by a 18650 battery using a dht22 to sense temperature and humidity. Connectivity is provided wireless using an esp12 sleeping deeply most of the time.

TTGO T-Controller ESP Arduino Framework code, using PlatformIO.

Yet Another Battery Cycler

OpenSCAD modell for an 18650 battery holder