Parts Used
Waveshare RP2040-LoRa
Amazon →
INA219 current/voltage monitor
Adafruit →
850mAh LiPo battery
Amazon →
TC4056A charging module
Amazon →
Strong small magnets
Amazon →
Case (currently Heltec V3 box)
3D print planned
About This Build
This build uses a Waveshare RP2040-LoRa board, with an INA219 for voltage and current monitoring, and a spare 850mAh battery (similar ones found here and here) that provides about two days of runtime, paired with a TC4056A battery charging module.
Currently using the case that a Heltec V3 board came in, with a 3D-printed case planned as an upgrade. The magnets were spares — similar ones can be found here.
Note: This build uses a fork of the main Meshtastic firmware in order to allow the INA219 board to function as the voltage sensor. Standard Meshtastic firmware will not support INA219 out of the box.