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1  Using Arduino / Displays / Re: Issue with Arduino Uno and 16x2 lcd on: February 28, 2013, 10:42:21 am
Thanks for helping. I've solved simply changing the socket… i don't know what's the difference because the switch adaptor has selectable output voltage and it's at 6,5V
2  Using Arduino / Displays / Re: Issue with Arduino Uno and 16x2 lcd on: February 28, 2013, 05:48:13 am
Oops, i'm sorry! I was tired and i forgot my sketch, but it's not the problem and nor os the led. The problem is: if arduino is connected with usb pc the display and all works as it have to work, but if i disconnect it from the pc and connect it with a 9V battery, the display go on loop.
Anyway here is the sketch.
Thanks
3  Using Arduino / Displays / Issue with Arduino Uno and 16x2 lcd on: February 27, 2013, 06:45:14 pm
Hi everyone, i'm new of this forum. I've search if other posts can help me, but i can't find one so i'm asking you help.
I'm using an Arduino Uno with a 16x2 lcd. I charged my sketch and i works good (the strings start scrolling on the display from right to left only when i push a pushbutton), but when i unlink Arduino from Mac usb and link it to the electricity adaptor the strings go on loop like there's no pushbotton and also the led it's always turned on.
Why the pushbotton doesn't work with 9V electricity and works with usb?
Thanks for help smiley

Here are the sketch
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