HEAT SENSOR

Components Required :

   *  9V Battery - 1
   *  3.3K ohm Resister - 1

   *  100 ohm Resister - 1

   *  BC548 Transistor - 1

   *  Electronic Buzzer - 1
   *  110 ohm Thermistor – 1
   *  Switch (optional) - 1
   *  4.7 V Diode - 1

Know about Components :

* Thermistor  : It is also called as Heat sensor. According to the Heat, the resistivity increases / decreases.

* BC548  : It is a Bi-Polar Transistor with 3 terminals. When any input is given to the base terminal, the connection exists between the emitter and collector terminals.

* Buzzer : When connecting it to any battery, u will hear a musical sound or a buzzer sound. 

Description :

Connect the Components as shown in the circuit. 

In this circuit, according to the Heat on Thermistor, the Buzzer will sound like alarm. 

This is because, when the Thermistor gets heated a voltage passes to the Base of the Transistor and the  Junction between emitter and collector gets connector and Buzzer will be ON.

Diode is used here to prevent back Emf.    

Hence HEAT SENSOR Module  is ready.


Pin Diagram of BC548 :

START TESTING YOURSELF !!!