ESP32 - Motion Sensor - Servo Motor

This tutorial instructs you how to use ESP32 with HC-SR501 motion sensor and Servo Motor. In detail:

Hardware Used In This Tutorial

1×ESP-WROOM-32 Dev Module
1×Micro USB Cable
1×HC-SR501 Motion Sensor
1×Servo Motor
1×Jumper Wires
1×(Optional) 5V Power Adapter
1×(Optional) DC Power Jack
1×(Optional) ESP32 Screw Terminal Adapter
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Introduction to Servo Motor and Motion Sensor

We have specific tutorials about servo motor and motion sensor. 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

ESP32 Motion Sensor Servo Motor Wiring Diagram

This image is created using Fritzing. Click to enlarge image

Initial Setting

Detection Range Adjuster Fully screw it in the clockwise direction.
Time Delay Adjuster Fully screw it in the anti-clockwise direction.
Repeat Trigger Selector Put jumper like the below image.
ESP32 motion sensor initial setting

ESP32 Code - Motion Sensor Controls Servo Motor

/* * This ESP32 code is created by * * This ESP32 code is released in the public domain * * For more detail (instruction and wiring diagram), visit */ #include <Servo.h> #define MOTION_SENSOR_PIN 17 // ESP32 pin GIOP17 connected to motion sensor's pin #define SERVO_PIN 26 // ESP32 pin GIOP26 connected to servo motor's pin Servo servo; // create servo object to control a servo // variables will change: int angle = 0; // the current angle of servo motor int lastMotionState; // the previous state of motion sensor int currentMotionState; // the current state of motion sensor void setup() { Serial.begin(9600); // initialize serial pinMode(MOTION_SENSOR_PIN, INPUT); // set ESP32 pin to input mode servo.attach(SERVO_PIN); // attaches the servo on pin 9 to the servo object servo.write(angle); currentMotionState = digitalRead(MOTION_SENSOR_PIN); } void loop() { lastMotionState = currentMotionState; // save the last state currentMotionState = digitalRead(MOTION_SENSOR_PIN); // read new state if (currentMotionState == LOW && lastMotionState == HIGH) { // pin state change: LOW -> HIGH Serial.println("Motion detected!, rotating servo motor to 90°"); servo.write(90); } else if (currentMotionState == HIGH && lastMotionState == LOW) { // pin state change: HIGH -> LOW Serial.println("Motion stopped!, rotating servo motor to 0°"); servo.write(0); } }

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.
  • On Arduino IDE, Navigate to Tools Manage Libraries
ESP32 add library
  • Type ESP32Servo on the search box, then look for the keypad library by Mark Stanley, Alexander Brevig
  • Click Install button to install servo motor library for ESP32.
ESP32 servo motor library
  • Copy the above code and paste it to Arduino IDE.
  • Compile and upload code to ESP32 board by clicking Upload button on Arduino IDE
  • Move your hand in front of sensor
  • See the change of servo motor

Video Tutorial

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