ESP32 - Motion Sensor - Servo Motor

We will learn:

Hardware Required

1×ESP-WROOM-32 Dev Module
1×Micro USB Cable
1×HC-SR501 Motion Sensor
1×Servo Motor
n×Jumper Wires
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About Servo Motor and Motion Sensor

If you do not have knowledge of servo motor and motion sensor (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 Motion Sensor Servo Motor Wiring Diagram

Image is developed using Fritzing. Click to enlarge image

Initial Setting

Time Delay AdjusterScrew it in anti-clockwise direction fully.
Detection Range AdjusterScrew it in clockwise direction fully.
Repeat Trigger SelectorPut jumper as shown on the image.
ESP32 motion sensor initial setting

ESP32 Code - Motion Sensor Controls Servo Motor

/* * Created by * * This example code is in the public domain * * Tutorial page: */ #include <Servo.h> // constants won't change const int MOTION_SENSOR_PIN = 7; // ESP32 pin connected to motion sensor's pin const int SERVO_PIN = 9; // ESP32 pin 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!"); servo.write(90); } else if (currentMotionState == HIGH && lastMotionState == LOW) { // pin state change: HIGH -> LOW Serial.println("Motion stopped!"); servo.write(0); } }

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
  • Move your hand in front of sensor
  • See the change of servo motor

Video Tutorial

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