Dear All, 
       I was helping someone to learn PIC Microcontrollers with a LED blinking program using a new PIC16F877A board. The LED was connected to the 8th pin of PORTB. I switched (on and off) all the eight pins of PORTB. The LED didn't glow.

I tried switching on the eight pin alone. It worked. I realised from the datasheet that all the eight pins of PORTB sinks 200mA of current. In order to make an array of LED's to glow, should I use BC 547 transistors?

The board uses a 11MhZ crystal. I see that the delay code that I downloaded from the HiTech C libraries is not functioning properly. The delay code seems to be unstable. How do I develop a perfect delay code for myself? I defined the clock frequency of my crystal in my code. But the delay seems to be erratic. 

Regards,
Sairam


      
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