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PIC to control charging time

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isaac12345

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Hi,

I'm trying to make a NiMH battery charger and was wondering if it would be feasible to use a PIC 16F84's internal timer to time 8 hours(after which the charging switches off).
Sorry if its a noob question, but I'm a noob with microcontrollers.
 

Hi,
The timer in 16F84 is 8-bit, so it can count only up to 255. With a clock of 4MHz (1MIPS carryout), you can only have a delay of 256 microsecond. Prescale that to 256, and you get 65.5ms. So you need to check for the delay MANY times. It does not seem feasible.
So, I think you should use a software loop for the 8-hour delay.
If you use C or BASIC, the compiler should have delay functions, which can loop as many times as required.
Take a look at:
**broken link removed**
**broken link removed**

Hope this helps.
Tahmid.
 

Thanks for the reply.

I am thinking of using C to program the microcontroller. Does the delay function stop the microcontroller from doing anything at all and puts it in a state similar to reset or simply makes it delay a certain number of seconds, during which its in its previous state, before moving on to the next instruction?
 

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