week 10:

OVERVIEW

This report describes the development project (PJT11). This project will use PIC16F873A to control NPN power transistor (BD135) further drive DC brushless fans, LEDs and buzzer when the certain temperature was detected. The value of temperature always displayed on a LCD screen. Circuit schematic and PIC source code will be provided.

FEATURES

PIC controlled DC brushless fan, LEDs and buzzer

-PIC16F873A with internal ADC read the analog voltage from LM35 (Temperature sensor) and      display it on LCD display.

BD135 power transistor

-Capable of driver DC brushless fan (0.12A)

Temperature sensor (LM35DZ)

-Sensor gain, 10mV/°C (average slope)

-0-100°C

-LCD display (always display the value of the temperature)

Fans, LEDs and buzzer are activated when the certain temperature was detected.