@jeffmon For me it's quite the opposite. I have a decent command of Arduino but struggle with analog electronics. Sometimes I feel like starting from ...

Even ESP32 boards are not a cost-effective solution in this case. What you should be really using is a standalone microcontroller like ESP32-12E chip ...

Thank you for the detailed analysis of the circuit and each component used. But can you explain this where you said, "The 1N4148 diode prevents curren...

@tech-geek You can also use "const int SENSOR_PIN A0"

Oh, I totally get where you're coming from, and you're making some valid points there. But like ESP32 boards which have WiFi and Bluetooth, some Ardui...