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Old 01-19-2011, 04:34 PM   #4233 (permalink)
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Yeah! RS232 is working. I de-soldered the 0.1 uFs and soldered in the 1.0 uFs (MAX232).

Looks exactly like you described - as soon as the throttle moves off 0 Ohms, the PWM ramps up to full throttle very quickly (because of the steady "faked" signal from the current sensor of zero amps) - and stays there until the throttle returns to zero ohms.

One could imagine a very bizarre situation where a current sensor failed, but gave a nice steady 'zero amps' (2.5V) signal to the controller. Then, if the throttle were touched a little, off you go - full speed. Doesn't seem a very likely failure mode, though.

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