You can use the following schematic diagram as a reference. The potentiometer middle pin should be connected to GPIO 34. You can use the preceding links or go directly to /tools to find all the parts for your projects at the best price! ESP32 DOIT DEVKIT V1 Board (read Best ESP32 development boards).To see how everything ties together, we’ll make a simple example to read an analog value from a potentiometer.įor this example, you need the following parts: Read Analog Values from a Potentiometer with ESP32

There is a very good video explaining these functions that you can watch here. Get the result of the conversion: returns 16-bit integer.

Check if conversion on the pin’s ADC bus is currently running (returns TRUE or FALSE).

adcStart(pin), adcBusy(pin) and resultadcEnd(pin): starts an ADC convertion on attached pin’s bus.

adcAttachPin(pin): Attach a pin to ADC (also clears any other analog mode that could be on).

Attenuation values are the same from previous function.

analogSetPinAttenuation(pin, attenuation): sets the input attenuation for the specified pin.

ADC_11db: The input voltage of ADC will be attenuated, extending the range of measurement to up to approx.

ADC_6db: The input voltage of ADC will be attenuated, extending the range of measurement to up to approx.

ADC_2_5db: The input voltage of ADC will be attenuated, extending the range of measurement to up to approx.

ADC can measure up to approximately 800 mV (1V input = ADC reading of 1088).

analogSetAttenuation(attenuation): sets the input attenuation for all ADC pins.

analogSetClockDiv(attenuation): set the divider for the ADC clock.

It has an effect of increasing sensitivity.

analogSetSamples(samples): set the number of samples in the range.

analogSetCycles(cycles): set the number of cycles per sample.

It can be a value between 9 (0 – 511) and 12 bits (0 – 4095).

analogSetWidth(width): set the sample bits and resolution.

analogReadResolution(resolution): set the sample bits and resolution.There are other more advanced functions to use with the ADC pins that can be useful in other projects. So, if you’re using Wi-Fi and you’re having trouble getting the value from an ADC2 GPIO, you may consider using an ADC1 GPIO instead, that should solve your problem. Note: ADC2 pins cannot be used when Wi-Fi is used. This means that when you read an analog input, its range may vary from 0 to 4095. These analog input pins have 12-bit resolution. Learn more about the ESP32 GPIOs: ESP32 Pinout Reference.

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