temperature control using pic16f877

[dre11]

i want to build a circuit like this link

http://www.pablin.com.ar/electron/circuito/mc/termost/index.htm[/url]

but i want the pic to also control the temperature.
as example, a box is heated by 4 bulb. n the circuit will detect the temperature.
when the temperature is 37c all 4 bulb will light up
when 38c 3 bulb will light up.
when 39c 2 bulb will light up.
when 40c 1 bulb will light up.
when 41c 0 bulb will light up n the fan will switch on
can u help me.

 

[cool.man]

You have to use 4 pins of the microcontroller as an output, connect 4 relays (1 relay with 1 pin each using transistor).
After that you read the temprature from LM35 and according to the temprature switch ON/OFF the relays.
You can see the attachment for the reference.

 

[dre11]

can u give me a simple program to include this addition