PC Temperature Controller

8/13/2019 PC Temperature Controller

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PC Temperature Controller EE181

Summary Description Circuit Diagram Components Video

PC temperature controller will give an alarm when your PC overheats . This will prevent the damage of

expensive components. Today's computer have inbuilt fan and also consume less power because of use of LSI

and VLSI technology . But sometimes it happen fan stop cooling due to any reason and unable to dissipate

heat. We do not come to know this and the microprocessor or motherboard inside the PC get over heated or

damage. This in turn led to failure of devices or your PC. So solve this problem you can use this simple circuit

which will give you alarm when your PC over heat. You can also install this small unit inside your PC.

Description

This circuit is based on three IC namely CA3130, E555 and LM35 which work as a sensor to detect the amount

of heat present with few more components.

IC CA3130 is a operational amplifier which combine the advantage of both CMOS and bipolar transistor on a

single chip. Operating voltage range varies from 5V to 16V. CA3130 has a advantage that they can be phase
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compensated with a single external capacitor and have terminals for adjustment of offset voltage. In this you

can adjust the reference voltage at inverting and non inverting pin so that when voltage at inverting pin is more

than non-inverting pin it will make the out pin high and vice versa. Pin configuration of CA3130 IC is shown

below.

And LM35 is a precision integrated circuit temperature and its output voltage is linearly proportional to

centigrade temperature. LM35 detects the surrounding temperature and according to reference value set it will

give you the output. When output voltage is multiplied by 100 it will give you the temperature sensed in

degrees. So you can easily set your reference voltage. Pin configuration of LM35 IC is shown below.

In this circuit we have set the fix voltage at inverting pin that is at pin 2 of IC2 and non inverting pin 3 of IC2 is

connected with the output pin 2 of IC1 through a resistor. Initially we have to do hit and trial to set the

temperature with the help of variable resistor VR1. VR1 provide a reference voltage that can be set anywhere

from 0V to approx. 1V.

In our circuit we have set a 0.71V approx at pin 2 which means when temperature reaches above 71 degree

Celsius it will give you an indicator with the help of speaker. Now when temperature at IC1 increases because

of overheating of components present inside PC voltage at pin 2 IC1 also increases which increase the voltage

at pin 3 of IC2 and when voltage become more than 0.71 V it will make the output pin 6 of IC1 high. This high

output is provided to pin 4 which reset input pin.

Here 555 timer is working in a-stable mode and high on reset pin will bring the IC3 into conduction making pin

3(output pin) high and speaker connected through it start sounding and when temperature reaches below the

set value speaker stop sounding to show that your device is safe.


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Circuit Diagram


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18,014-Reads

Resistor Resistor is a passive component used to control current in a circuit. Its

resistance is given by the ratio of voltage applied across its terminals to the

current passing through it. Thus a particular value of resistor, for fixed voltage,limits the current through it. They are omnipresent in electronic circuits. ...

12,218-Reads

Capacitor

Capacitor is a passive component used to store charge. The charge (q)

stored in a capacitor is the product of its capacitance (C) value and the

voltage (V) applied to it. Capacitors offer infinite reactance to zero frequency

so they are used for blocking DC components or bypassing the AC signals.

The capacitor undergoes through a recursive cycl...

8,868-Reads

Potentiometer Potentiometer (Pot) is another class of variable resistors and is used as an

adjustable voltage divider. It consists of a fixed resistance track having

connections at both ends and a sliding contact, called wiper, which moves

along this track by turning the spindle. If only one of the connections and

wiper are used, it behaves as a variable resistor or rheostat. In case wiper is

not used, it will offer fixed resistance across th...

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LM35 Temperature Sensor LM35 is a precision IC temperature sensor with its output proportional to the

temperature (ino

C). The sensor circuitry is sealed and therefore it is notsubjected to oxidation and other processes....
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Speaker

A loudspeaker (or "speaker") is a transducer that converts electrical energy

into acoustical energy. When an electric signal is applied to the input pin of

speaker, it generates sound waves. The other pin is connected to ground. A

speaker is commonly used to produce sound in response to a sensor output.

For example, in an...

120,165-Reads

555 Timer IC 555 is a very commonly used IC for generating accurate timing pulses. It is an

8pin timer IC and has mainly two modes of operation: monostable and

astable. In monostable mode time delay of the pulses can be preciselycontrolled by an external resistor and a capacitor whereas in astable mode

the frequency & duty cycle are controlled by two external resistors and a...
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PC Temperature Controller