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Analog sensor: potentiometer or light

A value that changes smoothly, from 0 to 4095: a knob, or the light in a room.

The test program

Test this part on its own before you build the rest: if it works alone, the rest is built on something you know works.

10 LED red, off
20 IF AREAD() > 2000 THEN LED red, on
30 WAIT 100
40 GOTO 10

What you should see: Turn the potentiometer, or change the light on the sensor: from halfway on, the red light comes on.

▶ Try it in the IDE

What to buy

  • Analog sensor (potentiometer or LDR)

How to wire it to an ESP32-S3

  1. Signal → ESP32-S3: GPIO9
  2. VCC → ESP32-S3: 3V3
  3. GND → ESP32-S3: GNDCommon ground: this link is mandatory.

If it does not work

The program runs but nothing happens
The signal wire is not on the analog pin, or the potentiometer's middle pin is swapped with a side one. The middle pin goes to the analog pin in the diagram, the two side pins to 3.3 V and GND (never 5 V).

What you can adjust

  • The threshold: the value, from 0 to 4095, above which the program reacts.

Which boards it works on

  • ESP32-S3 Freenove: yes
  • Nordic nRF54LM20 DK: yes
  • Arduino UNO R4 WiFi: yes