Motion Sensor Based Device Control

Optimize the energy consumption by activating your appliances only when human being are present in a room.

BeginnerFull instructions provided24 hours816

Things used in this project

Hardware components

Texas Instruments MSP-EXP430G2 MSP430 LaunchPad

Power Relay, SPDT

General Purpose Transistor NPN

Resistor 330 ohm

Resistor 1k ohm

PIR Motion Sensor (generic)

Software apps and online services

Texas Instruments Energia

Story

The problem statement provided to us during Makeathon event is to design a prototype of energy optimization system for a classroom. The situation is as follow: when no one is present in the room then the appliances remains in the off state, The appliances will be switched on if there is a human being present in the in the class.

The range of PIR sensor is within 10 m. The PIR sensor send electronic signal to MSP430 which in turn will send electronic signal to the relay, relay has three important terminals apart from coil terminals namely-common, normally open and normally close, The wire from normal open and common wire are being attached to the bulb.When the movement is detected then bulb glows.

The working video is shown below:

Code

code for device control using PIR sensor and MSP430G2 launchpad

const int PIRPIN = P1_4;
const int RELAYPIN = P1_5;/* PIR sensor O/P pin */
int warm_up;

void setup() {
  pinMode(PIRPIN, INPUT);
  pinMode(RELAYPIN,OUTPUT);
  Serial.begin(9600); /* Define baud rate for serial communication */
  delay(100); /* Power On Warm Up Delay */
   
}

void loop() {
  int sensor_output;
  sensor_output = digitalRead(PIRPIN);
  if( sensor_output == LOW )
  {
    Serial.print("No object in sight\n\n");
    digitalWrite(RELAYPIN,LOW);
    delay(100);
    Serial.println("Switch OFF");
    
  
  }
  else
  {
    Serial.print("Object detected\n\n");
    digitalWrite(RELAYPIN,HIGH);   
    warm_up = 1;
    delay(100);
    Serial.println("Switch ONN");
  
    
  }  
}