heat sensor with fan cooling
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Abstract for heat sensor with fan cooling is required and it's applications
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#2

The heat-activated cooling fan controller is a simple project that operates a brushless fan when the temperature in a given area exceeds a set point, when the temperature returns normal, the fan automatically shuts off. The project is built using LM358 Op-amp and LM35 temperature sensor. The project requires 12V DC power and can operate the 12V fan. This project is useful in the application as heat sink temperature controller, PC, heat-sensitive equipment, power supply, audio amplifiers, battery chargers, furnace etc ...


The SMD SO8 LM35 used as temperature sensor, LM358 act as comparator and provides a high performance when the temperature rise above the set point, the high output drive the transistor driver channel fan. The LM35 series are precision integrated circuit temperature devices with an output voltage linearly proportional to the centigrade temperature. The LM35 device has an advantage over linear temperature sensors calibrated in Kelvin, since the user is not required to subtract a large constant voltage from the output to obtain a suitable centigrade scale. The LM35 device does not require any external calibration or trimming to provide a typical accuracy of ± ¼ ° C at room temperature. Temperature detecting range 2 to 150 centigrade. LM35 provides an output of 10mV / centigrade.

Characteristics

O Source 12V DC 1Amps
O 12V DC fan, 500mA
O Range: 2 ° C to 150 ° C
O Open collector output
O Can drive PC fan
O On-board Preselection to adjust the fan trip level
O LED on board
O integrated output LED
O Output Controller Transistor
O Header connector for supply and fan
O Dimensions PCB 59.85 mm x 12.70 mm


Schematic diagram


[Image: SCH-1-1024x385.png]

Parts list 

[Image: bom.png]
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