Heat Sensor Circuit Using Thermistor

Heat sensor circuit using thermistor bc547 transistor.

Heat sensor circuit using thermistor. Bc548 is an npn transistor to 92 type. This circuit can be operated on wide range of temperature vary from 5v to 12v. In response to the heat it is exposed to it alters its electrical resistances to changes in temperature. How to build simple thermistor circuits.

We can use other alternatives like 2n2222 bc168 bc238 bc183 etc. In this article we go over how to build simple thermistor circuits. Since the thermistor is a variable resistor we ll need to measure the resistance before we can calculate the temperature. Abdul wadood 1 416 views 10 months ago.

It is used to detect the heat. Simple heat sensor circuit designed to give alert sound when the temperature reaches the desired threshold here we can adjust the temperature threshold level using variable resistor rv1. This circuit uses a negative temperature coefficient ntc as a sensor to sense the heat. Thermister is a special kind of resistor and its resistance depends on the temperature in its vicinity depending on its working thermistors are divided into two types.

It is an ideal add on circuit in heat generating devices like inverter and amplifier. A thermistor is a specialized resistor which changes resistance value depending on the amount of heat which it is exposed to. Heat sensor circuit has numerous applications in our daily life including companies industries shopping malls and residential areas for different reasons. Heat sensor using thermister is based on a commonly known ic ne555 timer wired in astable mode.

We have previously built the fire alarm using thermistor and fire alarm system using avr microcontroller today we are building very simple temperature sensor circuit or heat sensor circuit this circuit uses very few and basic components which can be easily available anyone can build it right away. Heat sensor circuit using thermistor bc547 transistor. This circuit utilize ntc negative temperature coefficient thermistor hence the resistance value of this device decrease when the temperature rises. This simple circuit is easy to construct and test.

Because the characteristics are almost the same for these types of transistors. The main reason behinds this is to prevent anything from fire accidents and improve the. However the arduino can t measure resistance directly it can only measure voltage. A basic thermistor circuit.

This is the circuit of a heat sensor that beeps when it detects heat. The frequency of oscillation of ne55 timer depends upon resistor r1 ntc. Heat sensor circuit has numerous applications in our daily life including companies industries shopping malls and residential areas for different reasons. Let s build a basic thermistor circuit to see how it works so you can apply it to other projects later.

Its main characteristic is that it is thermally sensitive.