Analog sensor -> ESP Home -> MQTT -> Node Red

Hardware
2

Most of (maybe all?) the microprocessors supported by ESPHome support analogue inputs:

  • ESP8266 : Only GPIO17 (A0) can be used for ADC input. You can also measure VCC voltage directly by setting pin: VCC , useful for low-voltage detection in battery-powered setups.
  • ESP32 : Multiple pins support ADC (e.g., GPIO32–GPIO39 for ADC1, GPIO0, GPIO2, GPIO4, etc. for ADC2). Use attenuation to measure voltages above 1.1V (e.g., 12dB for up to ~3.9V).
  • RP2040 (Raspberry Pi Pico) : GPIO26–GPIO29 are available. You can also measure VSYS via pin: VCC (GPIO29), though it may interfere with WiFi on Pico W.
  • nRF52840 : Supports AIN0–AIN7, VDD, and VDDHDIV5.

(The above from AI so double-check).

What kind of sensor do you want to use?

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How do you handle analog sensors? I wan to