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Minimal configuration

Posted: Wed Dec 12, 2012 12:02 pm
by no1unorightnow
I'm trying to setup a very minimal BBB. I have the ATMega328 in the socket on the board (both in the correct orientation), a voltage regulator (non-LDO) with the appropriate capacitors, power lines ran to where the power jack would go, the three resistors near the LED, the LED itself, and a 16MHz crystal with appropriate capacitors.

I tried shorting the diode spot near the power jack, but that didn't work (the shorting jumper got hot). So I tried leaving it open... nothing. I've already uploaded the "Blink" demo sketch, since I pulled this ATMega328 chip from a Duemilanove board (where it worked). I'm using a 9V power supply... not sure where I've gone wrong.

Ideas appreciated.

Re: Minimal configuration

Posted: Tue Dec 18, 2012 11:06 am
by paul
no1unorightnow ,

Sorry about the slow reply. Some email must have fallen through the cracks.
I'm not quite sure what you're trying to do. Are you actually using a BBB board, or just building a breadboard Arduino / BBB?

Your setup sounds about right. Do you have the shunt in that says "USB/EXT" - it won't run without that - or shorting the holes somehow

The diodes are configured reverse polarity across the power line - so shorting them will create a direct short - not surprised things got hot.

Pull out your meter and check for some voltages at proper places - see the schematic.

Hope that minimal info helps.

Paul

Re: Minimal configuration

Posted: Sat Dec 22, 2012 10:15 am
by floresta
Your setup sounds about right. Do you have the shunt in that says "USB/EXT" - it won't run without that - or shorting the holes somehow
I'm pretty sure that you also have to install the 15 uH shunt or short the holes. Otherwise you are not getting power to the AVCC pin and several of your I/O pins will not work.

Don