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1  Using Arduino / Displays / nokia 5110 lcd problem on: October 06, 2012, 07:09:39 pm
Hi there,
when i was trying to use the nokia 5110 lcd, i connected its GND to the 3.3v output from my microcontroller and its VCC to the ground. Will this damage the lcd? Now my screen only has a backlight but nothing else. I am not sure about my code. But maybe the lcd damaged already?
Thanks !
2  Using Arduino / Installation & Troubleshooting / Re: LED on without power supply?? on: March 24, 2012, 10:59:46 am
Oh sorry, 4V. Thanks!
3  Using Arduino / Installation & Troubleshooting / LED on without power supply?? on: March 24, 2012, 09:17:05 am
When I connected a ground and a 4V input to arduino GND and Analog pin 0 without USB or external power supply to the board, the onboard LEDs are turned on. Also the LEDs on the Xbee (connected to my board) are on.

Why? Is it I should avoid doing this? I found something about ESD protection diode but cannot understand.

Thanks for your help!
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