ESP32 - Motion Sensor - LED

This tutorial instructs you how to use ESP32 with HC-SR501 motion sensor and LED. In detail, ESP32 automatically turns on LED if the motion is detected, and turn off LED if otherwise.

Hardware Used In This Tutorial

1×ESP-WROOM-32 Dev Module
1×Micro USB Cable
1×HC-SR501 Motion Sensor
1×LED
1×220 ohm resistor
1×Breadboard
4×Jumper Wires
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Introduction to LED and Motion Sensor

We have specific tutorials about led 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

The wiring diagram with power supply from USB cable

wiring diagram between esp32 motion sensor led

This image is created using Fritzing. Click to enlarge image

The wiring diagram with power supply from 5v adapter

wiring diagram between esp32 motion sensor led  5v power adapter

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

/* * 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-motion-sensor-led */ #define MOTION_SENSOR_PIN 32 // ESP32 pin GIOP32 connected to the OUTPUT pin of motion sensor #define LED_PIN 17 // ESP32 pin GIOP17 connected to LED's pin int motionStateCurrent = LOW; // current state of motion sensor's pin int motionStatePrevious = LOW; // previous state of motion sensor's pin void setup() { Serial.begin(9600); // initialize serial pinMode(MOTION_SENSOR_PIN, INPUT); // set ESP32 pin to input mode pinMode(LED_PIN, OUTPUT); // set ESP32 pin to output mode } void loop() { motionStatePrevious = motionStateCurrent; // store old state motionStateCurrent = digitalRead(MOTION_SENSOR_PIN); // read new state if (motionStatePrevious == LOW && motionStateCurrent == HIGH) { // pin state change: LOW -> HIGH Serial.println("Motion detected!, turns LED ON"); digitalWrite(LED_PIN, HIGH); // turn on } else if (motionStatePrevious == HIGH && motionStateCurrent == LOW) { // pin state change: HIGH -> LOW Serial.println("Motion stopped!, turns LED OFF"); digitalWrite(LED_PIN, LOW); // turn off } }

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
  • Arduino IDE Upload Code
  • Move your hand in front of sensor
  • See the change of LED's state

Line-by-line Code Explanation

The above ESP32 code contains line-by-line explanation. Please read the comments in the code!

Video Tutorial

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