ESP32 - Potentiometer Triggers Servo Motor

This tutorial instructs you how to use ESP32 with the potentiometer to control servo motor. In detail:

We also learn how to convert the analog value to voltage and then use the voltage threshold to control the LED:

If you want to control the angle of servo motor in proportion to the value of potentiometer, see ESP32 - Servo motor controlled by potentiometer tutorial

Hardware Used In This Tutorial

1×ESP-WROOM-32 Dev Module
1×Micro USB Cable
1×Potentiometer
1×Servo Motor
n×Jumper Wires
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Introduction to Servo Motor and Potentiometer

We have specific tutorials about servo motor and potentiometer. Each tutorial contains detailed information and step-by-step instructions about hardware pinout, working principle, wiring connection to ESP32, ESP32 code... Learn more about them at the following links:

Wiring Diagram

wiring diagram between esp32 potentiometer servo motor

This image is created using Fritzing. Click to enlarge image

ESP32 Code - Analog Threshold

/* * This ESP32 code is created by esp32io.com * * This ESP32 code is released in the public domain * * For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-potentiometer-triggers-servo-motor */ #include <Servo.h> #define POTENTIOMETER_PIN 36 // ESP32 pin GIOP36 (ADC0) connected to Potentiometer pin #define SERVO_PIN 26 // ESP32 pin GIOP26 connected to Servo Motor's pin #define ANALOG_THRESHOLD 1000 Servo servo; // create servo object to control a servo void setup() { servo.attach(SERVO_PIN); // attaches the servo on pin 9 to the servo object servo.write(0); } void loop() { int analogValue = analogRead(POTENTIOMETER_PIN); // read the input on analog pin if (analogValue > ANALOG_THRESHOLD) servo.write(90); // rotate servo motor to 90 degree else servo.write(0); // rotate servo motor to 0 degree }

Quick Instructions

  • If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE.
  • Do the wiring as above image.
  • Connect the ESP32 board to your PC via a micro USB cable
  • Open Arduino IDE on your PC.
  • Select the right ESP32 board (e.g. ESP32 Dev Module) and COM port.
  • Copy the above code and paste it to Arduino IDE.
  • Compile and upload code to ESP32 board by clicking Upload button on Arduino IDE
  • Rotate the potentiometer
  • See servo motor rotating

ESP32 Code - Voltage Threshold

The analog value read from the potentiometer is converted to voltage, and then the voltage is compared to a voltage threshold. If it exceeds the threshold, it triggers a servo motor

/* * This ESP32 code is created by esp32io.com * * This ESP32 code is released in the public domain * * For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-potentiometer-triggers-servo-motor */ #include <Servo.h> #define POTENTIOMETER_PIN 36 // ESP32 pin GIOP36 (ADC0) connected to Potentiometer pin #define SERVO_PIN 26 // ESP32 pin GIOP26 connected to Servo Motor's pin #define VOLTAGE_THRESHOLD 2.5 // Voltages Servo servo; // create servo object to control a servo void setup() { servo.attach(SERVO_PIN); // attaches the servo on pin 9 to the servo object servo.write(0); } void loop() { int analogValue = analogRead(POTENTIOMETER_PIN); // read the input on analog pin float voltage = floatMap(analogValue, 0, 1023, 0, 5); // Rescale to potentiometer's voltage if (voltage > VOLTAGE_THRESHOLD) servo.write(90); // rotate servo motor to 90 degree else servo.write(0); // rotate servo motor to 0 degree } float floatMap(float x, float in_min, float in_max, float out_min, float out_max) { return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min; }

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