monitor battary voltage using pic16f877

[khatib]

i want to design circuit that can monitor car battary voltage, then the out put of this circuit will treat with PIC 16F877 , if battary has low voltage the PIC will out audiable warning .

thanks .
khatib

 

[Nigel Goodwin]

Use two resistors as an attenuator to feed the 12V to one of the PIC A2D inputs, I would suggest a ratio of 3:1 so you get an FSD of 5V on the PIC (assuming you're using the regulated 5V as a reference).

 

[khatib]

it is very good , can you write code using c or other language for that?

thanks alot

 

[Nigel Goodwin]

Check my tutorials for assembler examples of using the ADC.

 

[mister_e]

For C language, you may have a look at MikroC, Hi-tech, CCS demo version.

Install MPLAB and see what's already include in.

 

[selvatrinity]

Thanks a lot

____________________

Osho blessings,

Selvakumar.v