This device is used to read electric power usage from digital power meter with an blinking LED using an ESP8266 chip. ESPHome enables the values to be used in Home-Assistant.
A Fototransistor connected to Pin D1 captures the pulses of the power meter LED.
The wiring schema is as follows:
- Fototransistor Collector to 3.3V
- Fototransistor Emitter to D1
- 10 kOhm Resisitor from Fototransistor Emitter to GND