BLOCK DIAGRAM
WORKING
Components used for this project are PIR Sensor, Hall effect sensor, Arduino (ATMEGA328) Controller, Relay, Power Supply.
P I R sensor s allow you to sense motion, almost always used to detect whether a human has moved in or out of the sensors range. They are small, inexpensive, low-power, easy to use and don’t wear out. For that reason they are commonly found in appliances and gadgets used in homes or businesses. They are often referred to as P I R, “Passive Infrared”, “Pyroelectric”, or “IR motion” sensors.
A Hall effect sensor is a transducer that varies its output voltage in response to a magnetic field. Hall effect sensors are used for proximity switching, positioning, speed detection, and current sensing applications.
In its simplest form, the sensor operates as analog transducer, directly returning a voltage. With a known magnetic field, its distance from the Hall plate can be determined. Using groups of sensors, the relative position of the magnet can be deduced.
When door is opened or closed Hall effect sensor is activated and controller switches the relay correspondingly. After 2 seconds PIR sensor is activated and it checks for any motion inside the room. If there is motion then bulb is switched on and will be switched off when there is no motion.
CIRCUIT
PROGRAM
void setup()
{
pinMode(13,OUTPUT);
pinMode(5,INPUT_PULLUP);//hal
pinMode(6,INPUT);//pir
}
void loop()
{
if((digitalRead(5)==0)&&(digitalRead(6)==1))
{
digitalWrite(13,HIGH);
delay(1000);
digitalWrite(13,LOW);
}
else if (digitalRead(5)==1){ digitalWrite(13,HIGH); delay(1000);}
else;
}