ESP32 - Potentiometer Triggers Servo Motor

In a previous tutorial, We have learned how to rotate servo motor according to the potentiometer's output value. In this tutorial, We are going to learn how to:

Hardware Required

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

If you do not have knowledge of servo motor and potentiometer (pinout, how they work, how to connect them to ESP32, how to program for them...), learn about them in the following tutorials:

Wiring Diagram

ESP32 Potentiometer Servo Motor Wiring Diagram

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ESP32 Code - Analog Threshold

/* * Created by esp32io.com * * This example code is in the public domain * * Tutorial page: https://esp32io.com/tutorials/esp32-potentiometer-triggers-servo-motor */ #include <Servo.h> // constants won't change const int POTENTIOMETER_PIN = A0; // ESP32 pin connected to Potentiometer pin const int SERVO_PIN = 9; // ESP32 pin connected to Servo Motor's pin const int ANALOG_THRESHOLD = 500; 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 Steps

  • If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE
  • Connect the ESP32 board to your PC via a micro USB cable
  • Open Arduino IDE, select the right ESP32 board and COM port
  • Copy the above code and paste it to Arduino IDE
  • Click Upload button on Arduino IDE to compile and upload code to ESP32 board
  • Rotate the potentiometer
  • See the change of servo motor

ESP32 Code - Voltage Threshold

Potentiometer's analog value is converted to voltage value, and then compared to voltage threshold to triggers servo motor

/* * Created by esp32io.com * * This example code is in the public domain * * Tutorial page: https://esp32io.com/tutorials/esp32-potentiometer-triggers-servo-motor */ #include <Servo.h> // constants won't change const int POTENTIOMETER_PIN = A0; // ESP32 pin connected to Potentiometer pin const int SERVO_PIN = 9; // ESP32 pin connected to Servo Motor's pin const float 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; }

Video Tutorial

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Potentiometer and Servo Motor on Commercial Products

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