ESP32 based ethernet I/O board for home automation compatible with ESPHome, Tasmota, etc.
Are meant to be used for reading pulses from utility meter ie. power meter with S0 output
Should you need more inputs/outputs (up to 96 more inputs/outputs or combination thanks to changing the address of MCP23017) you can use the same PCB. Just don't populate ETH breakout board and ESP32 and solder AMS1117-3.3 with its capacitor. The boards will be connected via SDA/SCL but thanks to a bus buffer (P82B96) communication can easilly be made up to 20 meters (possibly more by reducing speed of I2C bus)!
In this mode the "slave" device can't make use of S0 inputs nor the PWM outputs
For more information please visit wiki