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SIMPLE HEAT SWITCH CIRCUIT

Hello everyone,

Here we are discussing about a Simple Heat sensing or detecting circuit.

This circuit indicates you whenever it senses Temperature. The sensing is done by using a THERMISTOR of 110 ohms. The resistance of Thermistor reduces on increase in Temperature which makes the LED glow.


The circuit is powered by a 6V battery.


CIRCUIT DIAGRAM FOR HEAT DETECTOR


temperature sensor circuit diagram



Components used:-

R1 THERMISTOR 110Ω

R2 100Ω

R3 3.3KΩ

Q1 Bc548 NPN


You can also Try Smoke Detector using 555 Timer

Post a Comment

  1. nice circuit. i have one question, in which temperature your circuit will glow the led ?

    ReplyDelete
    Replies
    1. Thank You For Your comment......

      I think the led will glow after 45 degree C.

      Delete
  2. @TITTU THOMAS
    please can u tell me if i can use this circuit as a fever detector circuit? thanks

    ReplyDelete
    Replies
    1. The Circuit is not capable to detect precise temperature......

      Delete
  3. sir i use another value of thermister like 1kohm, and for 6v i used an rectefier,,,,,,,,,,,,,

    ReplyDelete
  4. I implemented your circuit, but the LED lights up immediately, is that normal?

    ReplyDelete

 
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