AirMeter: Stream an AN870 Multimeter's LCD to Your Browser

Short summary

AirMeter is an open-source hardware mod that taps an AN870 multimeter's LCD signals via an RP2040 and comparators, then streams live readings over 433 MHz radio to an ESP32-C3 serving a web page. The project cleverly reverse-engineers the 4x15 multiplexed LCD matrix since the hidden UART port is inaccessible. Schematics, board files, and firmware are available, and the method ports to other budget meters using the DTM0660 chip.

• •Open-source mod streams multimeter LCD to browser or OBS via RP2040 + ESP32-C3
• •Reverse-engineers 4x15 multiplexed LCD using LM339 comparators instead of inaccessible UART
• •Method ports to any budget meter built on the DTM0660 chip

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