avr-power-meter

Device for monitoring bidirectional DC energy usage using various shunt resistors. Designed to mount directly on the shunt.

This version targets 48 V systems (supports up to 85 V on the sensing side).

It is galvanically isolated from the power supply to prevent ground loops.

It communicates via the Modbus RTU protocol over an RS-485 interface.

The core components are the INA228 sensor and an ATtiny1626 microcontroller.

History

See the v1 (test) version in [v1] branch.
See the v2 (for 24V systems) version in [v2] branch.

Board

Photos