Published October 1, 2017 © GPL3+

Motion Detection Lamp

A motion detection lamp. It switches on and off when there's motion.

BeginnerFull instructions provided19,129

Things used in this project

Hardware components

Arduino UNO

PIR Motion Sensor (generic)

Jumper wires (generic)

Breadboard (generic)

LED (generic)

Story

Overview

This motion detection lamp basically switches on and off when there is motion. The PIR sensor acts as a switch. Initially the idea was to make a mood lamp activated by light sensor. But with a few circumstances, the idea gradually changed. First and foremost, I assembled the wiring.

This photo was taken after everything was assembled and the PIR is already on the lid (accidentally deleted the before)

Step 1

Next, I wrote up the coding. The coding was not as easy as I thought, since I am still new to this. I had a few difficulties in writing it to make the LEDs turn on and off only when there is motion. The normal coding for motion allows it to only detect motion and automatically the LEDs will turn off when it does.

Step 2

After much trial and error, the write up is done, so I uploaded the code onto the Arduino Uno. Hence the assembly of the lamp begins. Even though the coding is done, there is a slight imperfection such that after the motion is detected to turn on the lamp, I need to wait for approximately 10 seconds after all motion has stopped to do another motion to turn off the lamp.

1 / 9 • Led's light up

Step 3

A touch sensor was supposed to be a part of the lamp. But I had difficulty combining together both the codes for the PIR sensor and the touch sensor. They work separately, but when they are merged together it doesn't work as I planned. The touch sensor was meant to adjust the brightness of the lamp.

Code

MotionDetectionLamp code

 
int blue = 12;                // choose the pin for the LED
int red = 10;
int green = 11;
int green2 =5;
int red2 = 4;
int inputPin = 7;               // choose the input pin (for PIR sensor)
int pirState = LOW;             // we start, assuming no motion detected
int val = 0;                    // variable for reading the pin status
int x = HIGH;
int pirReading;
//int pulseSpeed = 100 ; 

void setup() {
  pinMode(blue, OUTPUT);      // declare LED as output
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(green2, OUTPUT);
  pinMode(red2, OUTPUT);
  pinMode(inputPin, INPUT);     // declare sensor as input
 
  Serial.begin(9600);
}
 
void loop(){

  val = digitalRead(inputPin); 
                     // read input value
                     
        if (val == HIGH) {  
          if (x == HIGH) {                    // check if the input is HIGH
          digitalWrite(blue, HIGH); 
          digitalWrite(red, HIGH);
          digitalWrite(green, HIGH);
          digitalWrite(green2, HIGH);
          digitalWrite (red2, HIGH);
          Serial.println("Motion 2");
          }
          else{
           digitalWrite(blue, LOW);
           digitalWrite(red, LOW);
           digitalWrite(green, LOW);
           digitalWrite(green2, LOW);
           digitalWrite(red2, LOW);
           Serial.println("Motion 1");  
          }
          if (pirState == LOW) {
           // we have just turned on
            Serial.println("Motion detected!");
            // We only want to print on the output change, not state
            pirState = HIGH;
            } 
          
  
        }   
    
    else {
    
    if (pirState == HIGH){
      if (x==HIGH){
        x=LOW;
      }
      else {
        x=HIGH;
      }
      // we have just turned of
      Serial.println("Motion ended!");
      // We only want to print on the output change, not state
      pirState = LOW;
      
    }
    //delay(pulseSpeed);
  }
}