week 9:

Flow Chart

GENERAL DESCRIPTION 

PIC has been used to control the LED or buzzer directly for some other projects. But in this project, PIC cannot directly activate the DC brushless fan because it has not enough current.NPN power transistor (BD135) is required, so that dc brushless fan can be controlled by PIC.PIC16F873A will read the analog voltage (using ADC) from LM35 temperature sensor and display it on LCD display. A buzzer, LEDs or fans will be activated when temperature reach a certain temperature value.

For this project, temperature sensors (LM35) and cooling fans are connected to the circuit board through some wires and connectors. The length of the wires is various depend on the distance of certain where would be measured. Each polarity should be correctly connected. Differentiate the of the connector and please use 2510 connector for LM35 and 2532 connector for cooling fan.