I had just connected Tx pin of nano board A to Rx pin of nano board B. To my surprise, board B was powered and it was fully operational when I connected Gnd. Not sure how this happened. Verified this with one more board and it is consistent. Burnt LED blink program in board B and works perfectly. Board A is also functional and I used to send some data to board B.
Joined: Fri. Aug 14, 2015
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