Motion tracking with PIR sensor : ARDUINO
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Description
In This Project I used 2 PIR infrared sensors with an Arduino to sense motion either on the left or on the right side. The result will trigger an LED to represent each PIR sensor then I also added in a servo to be controlled – so it turns left when triggered by the left sensor and so on.
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Component Requirements
2x 220 Ohm resistor (Red, Red, Brown, Gold)
2x 10K Ohm resistor (Brown, Black, Orange, Gold)
2x PIR sensor
1x Servo (has to need no more than 5v supply)
2x LED
Arduino Deumilanove w/ ATMEGA328
Breadboard / Prototyping board
Jumper/ Connector wires
Optional 9V DC power supply or use the USB power for the Arduino
You will also need a soldering iron and solder if you use the same PIR as myself.
Some sort of temporary adhesive to hold the sensors in place.
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Circuit Diagram
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Arduino Code
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We have 1 sensor for left, 1 for right.
The left sensor is triggered, the LED for the left comes on and the servo moves until no motion is detected.
The same happens if the right sensor is triggered.
If both sensors detect motion then its likely the object may be between the 2 but given the field of detection
its not going to be precice. Enjoy!
*/
#include Servo myservo; // Create a servo object
int pos = 0; // Variable to store the servo position in degrees
int pinPIRleft = 4; // left infrared sensor, digital pin 4
int pinLEDleft = 8; // left LED, digital pin 8
int pinPIRright = 2; // right sensor, digital pin 2
int pinLEDright = 10; // right LED, digital pin 10
void setup() {
pinMode(pinLEDleft, OUTPUT); // set LEDs as outputs
pinMode(pinLEDright, OUTPUT);
pinMode(pinPIRleft, INPUT); // set sensors as inputs
pinMode(pinPIRright, INPUT);
myservo.attach(9); // set the servo to digital pin 9
}
void loop() {
if (digitalRead(pinPIRleft) == LOW) { // if left detects motion
digitalWrite(pinLEDleft, HIGH); // turn on LED
if ((pos < 180) && (digitalRead(pinPIRright) == HIGH)) { // if less than 180 degrees and the right sensor is off then move servo
pos += 1; // increment servo degrees by +1
myservo.write(pos); // write the position to the servo
delay(15);
}
} else {
digitalWrite(pinLEDleft, LOW); // otherwise turn off LED and no servo movement
}
if (digitalRead(pinPIRright) == LOW) {
digitalWrite(pinLEDright, HIGH);
if ((pos >= 1) && (digitalRead(pinPIRleft) == HIGH)) {
pos -= 1;
myservo.write(pos);
delay(15);
}
} else {
digitalWrite(pinLEDright, LOW);
}
if ((digitalRead(pinPIRleft) == LOW) && (digitalRead(pinPIRright) == LOW)) {
// do something here if both sensors detect movement.
}
}
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