What if, the speed of the fan is controlled depending on room temperature? This is a small initiative to this idea. The heart of the project is PIC 16F873A. The technical support for this project is provided by Blue apple technolabs Pvt ltd, Kaloor , Kochi.
The project employs an LM35 temperature sensor, L293D motor controller, An LCD for displaying the temperature and a small SMPS fan for the demo purpose. LM 35 is widely available, simple transducer. L293D is used so as to control the speed of the fan by inputing PWM output of the microcontroller.
Output of the LM35 is connected to the RA0 pin of the PIC16F873A. The Operating temperature range of the system 24 degree C to 62 degree C. 24 degree C is the lower cut off range and 62 degree C is upper cut off range. The fan stops operating at this cut off points. The speed of the fan gradually increases as the temperature increases from 26 degree C.
Plse click on the thumbnail below for the program.
Tools required:- MPLAB IDE v8.10, HITECH PIC C Compiler
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