AVR dragon Connection-Power supply

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Hello all,

 

I am kind of new member.... feeling great being a part of such creative forum..

 

So here is my question

 

I am trying to test my AVR dragon using LED blinking, my circuit is as below,

 

1) AVR -> Atmega328P <- AVR supply ,

All works fine, I am able to enter into the download mode. ( Tools ->  Device Programming )

 

but

2) AVR -> Atmega328P <- Power supply ( ATX Cabinate supply of my old PC ).

when  I am trying to enter into the download mode. It gives error when reading the device ID. I think it is because of the floating ground of the different supply. I have short circuit all the grounds.

 

My question is how to correct it ???.... Kindly help me to resolve the problem.

 

Rgds

Goswami Sourabh,

The Creator....