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[DPRG] BristleBot
Subject: [DPRG] BristleBot
From: DeltaGraph at aol.com
DeltaGraph at aol.com
Date: Tue Jan 1 19:23:46 CST 2008
Hey Jeff, Thanks
Thinking on PWMing motors
I guess my tiny13 won't be driving the beasties.
Maybe Tiny26 -- Dale mentioned that part drives 40 mA per pin - so I looked
it up
200 mA for total part -- so reasonable. So I assume could tie 3 pins and
pretty much drive motor.
Of course would lose out on direct PWM output, but PWM gen can generate soft
interrupts which could
be used to twiddle bits on multiple pins.
Tiny26 will run at 3 volts -- could always current limit motors just a tad
with series resistance.
I assume motors would not kill Tiny's pins with flyback spikes. Oh well, $2
down the drain if they do.
I really like the idea of not having to involve an h-bridge or driver
transistors/fets -- too much complexity
I know connecting 24 volts to an AVR pin will blow it.
Did get away with driving one on a Mega128 to almost dead short (8 ohm
speaker) for some time and it survived. The chip was running real hot -- then I
discovered a series resistor was shorted.
Ron
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