In this instructables we are going to create a simple circuit with an Arduino and PIR motion sensor that will detect the movement of a living being. An LED will light ON when movement is detected.
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Step 1: Things You Need
Step 2: Schmatics
Assemble all the parts by following the schematics below.
Step 3: Code
Upload the following code.
int led = 13; // the pin that the LED is atteched to
int sensor = 2; // the pin that the sensor is atteched to
int state = LOW; // by default, no motion detected
int val = 0; // variable to store the sensor status (value)
pinMode(led, OUTPUT); // initalize LED as an output
pinMode(sensor, INPUT); // initialize sensor as an input
Serial.begin(9600); // initialize serial }
val = digitalRead(sensor); // read sensor value
if (val == HIGH)
// check if the sensor is HIGH
// turn LED ON delay(100);
// delay 100 milliseconds
if (state == LOW)
state = HIGH;
// update variable state to HIGH
// turn LED OFF delay(200);
// delay 200 milliseconds
if (state == HIGH)
state = LOW;
// update variable state to LOW
Step 4: Detecting Motion
So after connecting everything together and uploading the code into arduino you can see whenever any living being comes anywhere near to sensor then it gets triggered and LED turns ON and you can use this sensor in your motion triggered project.