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
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