At 04:14 PM 2/5/2011, Nathan House wrote:

>I'm not sure if I connected the flyback diodes correctly in my
>circuit. Here's the schematic:
>http://www.roboticsguy.com/images/misc/balancing_robot/balancing-robot-boa=
rd-schematic-r8.png.
>Is that the right way to do it?

I see one oddity: the motor driver chip is powered from Vdd but the=20
positive side of the clamp diodes goes to Vcc.  The positive side of=20
the clamp diodes should go to the same power supply line as what=20
powers the driver chip.

Question: why do you have 10k resistors in series with all of the=20
control inputs to the driver chip?  If the driver chip has internal=20
pull-up or pull-down resistors, you will have problems.  Even if the=20
driver doesn't have pull-up or pull-down resistors, I'd be tempted to=20
reduce those series resistors to 1k or so.

dwayne

--=20
Dwayne Reid   <dwayner@planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax
www.trinity-electronics.com
Custom Electronics Design and Manufacturing

--=20
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