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June 11, 2013
about 4 years ago
Mine went silently. But took my uno with it. 12V DC down one of the io pins!
Sparkfun is being really good about the whole thing though. Got to give them Kudos for that!
Thanks guys for the great customer service.
Measure the voltage from TP1 to GND on the board. It’s in the manual. here’s an excerpt:
If your BED uses .11 ohm sense resistors (all v1.2 and above BEDs): The range of the
pot produces maximum motor currents from around 0mA (fully clockwise) to 5A (fully
counterclockwise). Now, the driver can’t supply 5A, so the full range of the pot won’t be
used. A Vref of 1.76V will result in a motor current of 2A.
The equasion for this relationship is
Itripmax = Vref/(8 * Rs)
Where Itripmax is the maximum current delivered to the motor, Vref is the voltage on
TP1, and Rs is the sense resistor value.
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