Arduino UNO R4 - Motion Sensor - Relay

Welcome! This tutorial will show you how to use an Arduino UNO R4 with a motion sensor and a relay. It’s simple and clear, perfect for beginners. The motion sensor detects movement, and the relay can turn devices ON or OFF. For example, you can control a light, motor, or LED strip. By the end, you will know how to:

Turn the relay ON when the motion sensor detects movement.
Turn the relay OFF when there is no movement.

You will learn to program the Arduino UNO R4 to read the motion sensor and control the relay. Connect the relay to a device like a light bulb or fan, and the motion sensor will manage it. This project is great for anyone who wants to start with Arduino and make their home smarter. Let’s get started!

Hardware Preparation

1	×	Arduino UNO R4 WiFi or Arduino UNO R4 Minima
1	×	USB Cable Type-A to Type-C (for USB-A PC)
1	×	USB Cable Type-C to Type-C (for USB-C PC)
1	×	HC-SR501 Motion Sensor
1	×	Relay
1	×	Jumper Wires
1	×	Optionally, Solenoid Lock
1	×	Optionally, 12V Power Adapter
1	×	Optionally, DC Power Jack
1	×	Recommended: Screw Terminal Block Shield for Arduino UNO R4
1	×	Recommended: Breadboard Shield for Arduino UNO R4
1	×	Recommended: Enclosure for Arduino UNO R4
1	×	Recommended: Power Splitter for Arduino UNO R4
1	×	Recommended: Prototyping Base Plate & Breadboard Kit for Arduino UNO

Or you can buy the following kits:

1	×	DIYables Sensor Kit (30 sensors/displays)
1	×	DIYables Sensor Kit (18 sensors/displays)

Disclosure: Some of the links provided in this section are Amazon affiliate links. We may receive a commission for any purchases made through these links at no additional cost to you.
Additionally, some of these links are for products from our own brand, DIYables .

Overview of Relay and Motion Sensor

If you are not familiar with relay and motion sensor (pinout, their functions, and programming), please refer to the following tutorials to learn more:

Wiring Diagram

This image is created using Fritzing. Click to enlarge image

See The best way to supply power to the Arduino Uno R4 and other components.

Initial Setting


Time Delay Adjuster	Screw it in anti-clockwise direction fully.
Detection Range Adjuster	Screw it in clockwise direction fully.
Repeat Trigger Selector	Put jumper as shown on the image.

Arduino UNO R4 Code

/* * This Arduino UNO R4 code was developed by newbiely.com * * This Arduino UNO R4 code is made available for public use without any restriction * * For comprehensive instructions and wiring diagrams, please visit: * https://newbiely.com/tutorials/arduino-uno-r4/arduino-uno-r4-motion-sensor-relay */ #define MOTION_SENSOR_PIN 10 // The Arduino Uno R4 pin connected to the OUTPUT pin of motion sensor #define RELAY_PIN 3 // The Arduino Uno R4 pin connected to the IN pin of relay int motion_state = LOW; // current state of motion sensor's pin int prev_motion_state = LOW; // previous state of motion sensor's pin void setup() { Serial.begin(9600); // initialize serial pinMode(MOTION_SENSOR_PIN, INPUT); // set arduino pin to input mode pinMode(RELAY_PIN, OUTPUT); // set arduino pin to output mode } void loop() { prev_motion_state = motion_state; // store old state motion_state = digitalRead(MOTION_SENSOR_PIN); // read new state if (prev_motion_state == LOW && motion_state == HIGH) { // pin state change: LOW -> HIGH Serial.println("Motion detected!"); digitalWrite(RELAY_PIN, HIGH); // turn on } else if (prev_motion_state == HIGH && motion_state == LOW) { // pin state change: HIGH -> LOW Serial.println("Motion stopped!"); digitalWrite(RELAY_PIN, LOW); // turn off } }

Detailed Instructions

Follow these instructions step by step:

If this is your first time using the Arduino Uno R4 WiFi/Minima, refer to the tutorial on setting up the environment for Arduino Uno R4 WiFi/Minima in the Arduino IDE.
Wire the components according to the provided diagram.
Connect the Arduino Uno R4 board to your computer using a USB cable.
Launch the Arduino IDE on your computer.
Select the appropriate Arduino Uno R4 board (e.g., Arduino Uno R4 WiFi) and COM port.
Connect the Arduino UNO R4 to your computer using a USB cable.
Open the Arduino IDE and choose the correct board and port.
Paste the provided code into the Arduino IDE.
Click the Upload button in the Arduino IDE to send the code to the Arduino UNO R4.

Wave your hand in front of the sensor
Observe the relay's status change

Code Explanation

Look at the explanations in the comments inside the source code!

Video Tutorial

Learn More

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