pic programming failed

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Re: pic programming failed

Postby dmitri » Fri Aug 21, 2009 2:02 pm

Doesn't look like you know how to use a multimeter. Look at http://www.wikihow.com/Use-a-Multimeter, notice what it says about a COM (common) jack. In electronics "common" is the same as "ground".
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Re: pic programming failed

Postby Firelord » Fri Aug 21, 2009 2:09 pm

dmitri wrote:Doesn't look like you know how to use a multimeter. Look at http://www.wikihow.com/Use-a-Multimeter, notice what it says about a COM (common) jack. In electronics "common" is the same as "ground".

I.e. the black probe is usually the 'common' probe. So it should be connected to the 'COM' input on the meter.
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Re: pic programming failed

Postby oliboy » Fri Aug 21, 2009 2:12 pm

what should the readings be across the pins?..
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Re: pic programming failed

Postby Firelord » Fri Aug 21, 2009 2:54 pm

oliboy wrote:what should the readings be across the pins?..

Yawn. Excuse me. I think this is going to take a while.

Here are the correct measurements between GND and several pins of the PIC.

1: 5V
8: 0V
14: 3.3V
19: 0V
20: 5V
26: 0V

Measure the voltage values on pins 1, 8, 14, 19, 20 and 26 of the PIC and post the results here.
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Re: pic programming failed

Postby oliboy » Sun Sep 06, 2009 9:57 am

still can't program my pic...still getting couldn't initialize programmer...here's a screen shot of my winpic setting...is something wrong..
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Re: pic programming failed

Postby dmitri » Sun Sep 06, 2009 11:23 am

Firelord wrote:Measure the voltage values on pins 1, 8, 14, 19, 20 and 26 of the PIC and post the results here.

oliboy, shall we guess what you measured?
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Re: pic programming failed

Postby oliboy » Mon Sep 07, 2009 1:16 pm

here are my voltage readings....

1: 5V
8: 0V
14: 0V
19: 0V
20: 5V
26: 0V
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Re: pic programming failed

Postby dmitri » Mon Sep 07, 2009 2:34 pm

oliboy wrote:here are my voltage readings....

1: 5V
8: 0V
14: 0V
19: 0V
20: 5V
26: 0V

If the readings are right then PIC18F2550 is most likely fried/faulty. Pin 14 must be 3.3V.
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Re: pic programming failed

Postby oliboy » Tue Sep 08, 2009 2:26 pm

i thought that should be the reading and my pic is fried/faulty?..
what then should i do?..
redo my board or just buy a new pic?..
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Re: pic programming failed

Postby dmitri » Tue Sep 08, 2009 2:31 pm

oliboy wrote:i thought that should be the reading and my pic is fried/faulty?..

If there are no errors (shorts/breaks and etc) on the board then the PIC is faulty.

what then should i do?..
redo my board or just buy a new pic?..

If there are errors on the board then either correct them or make another board.
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