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From: | Marge Coahran |
Subject: | Re: [avr-chat] battery-operated AVRs |
Date: | Tue, 11 Mar 2008 21:23:31 -0500 (CDT) |
Hi Bob,I may not have time to draw and post a diagram before heading to the airport for my meeting tomorrow, but verbally here it is:
AVR:GND to ground end of 3 AAA's in series AVR:Vcc to +4.5 end of 3 AAA's 1uF bypass capacitor PA0-PA7 to input pins on 7-segment display each (of 2) 7-seg ground pins through 100 Ohm resistor to ground (Yes, it's common cathode.) That's it.I have not got this working yet, but the circuit still works correctly when powered by the STK500, so I am now wondering whether the problem is the need for an external clock, as Michai suggests.
However, I have switched to an alternate strategy, and I am now stringing 9 AA batteries together to power the STK500. This is working, so far. Any guesses how long these batteries can power this setup? I only need about an hour...
-Marge On Tue, 11 Mar 2008, Robert L Cochran wrote:
Can you post a circuit diagram? Have you worked out a power budget for the circuit? I'm following the discussion with great interest. Thanks Bob Cochran Marge Coahran wrote:Does anyone have experience running AVRs on batter power? I want to give a brief demo at a venue without AC. I was hoping that 3 AAA batteries would work, since that gives 4.5V and the datasheet says the AVR I am using (Atmega8515L) can accept 2.7-5.5V power supply. However, this does not work. Perhaps AAA does not produce enough current? Does anyone know if using larger batteries (AA, C, etc) would work, and if so what batteries I need? Marge _______________________________________________ AVR-chat mailing list address@hidden http://lists.nongnu.org/mailman/listinfo/avr-chat
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