2026-jan-10 update: I've included a demo arduino app (note, it needs 2 libs, also in my sercona github) that will parse the raw opto out and print the human readable values over serial. Its just a demo to show how to use the library. Also note, the library for the chipset still needs some tweaks, mostly on the unusual values given for an open-circuit or overflow or other non-typial values.
This is a wireless (wifi, web/REST) interface that allows remote reading of the current multimeter value, including its mode.
Optionally, it can also interface with a wireless footswitch (pedal). This can trigger a network message being sent (mqtt, etc) as well as an optional trigger sent to a speech synthesizer. Both of those projects are also Arduino/esp32 based.
Parts needed are simple:
- photo diode (https://www.amazon.com/gp/product/B07VNSX74J)
- esp32c3 mini (https://www.amazon.com/DWEII-ESP32-C3-Development-Bluetooth-Frequency/dp/B0CW62PPZ1)
- DC barrel jack, 5.5 x 2.1mm (https://www.amazon.com/gp/product/B07SV6KCT5)
- 200 ohm 1/8 watt resistor (power rating not imporant)
- (2) m2 x 6mm screws and nuts
- i2c oled display (https://www.amazon.com/gp/product/B0925SSKHB)
