ESP32 Wroom32 DevKit Analog Read Example

The ESP32 has an analog to digital converter built into it with a resolution of up to 12 bits which is 4096 distinct values. What that means is that 0 volts will produce a digital value of 0 while the maximum voltage will produce a digital value of 4095.

ESP32 Analog Input with Arduino IDE

DOIT ESP32 DEVKIT V1 Board · Issue #544 · espressif/arduino-esp32 · GitHub

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ESP32 Analog Input with Arduino IDE