C-Control Pro

Störung auf linker radencoder: entwurfsfehler Kategorie: Pro-Bot128 (von PepeV - 8.02.2010 22:22)

The outputs of Timer T1 PWM X (X1_3 / OC1A and X1_2 / OC1B) couse interference on the collector of the left wheel encoder phototransistor T3, which is connected to input port X1_9 / INT7. This is coused by a design error on the printed circuit board of the drive unit. On the top side of that board the wire that runs from T3 to CON2 runs very close and parallel to the two lines on the bottom side that carry the PWM signals for the motors. The result is that INT7 (left counter) receives extra pulses from interference and the robot will not drive strait at low speeds. (At low speeds the pulses from the phototransistors are less steep and therefore more sensitive to interference.) I solved the problem by disconnecting the printed wire from T3 to CON2 (cutting it near T3 and CON2) and replacing it with a shielded wire. But hopefully the designers will find a more elegant solution by altering the printed circuit board.
Antwort schreiben Antworten: Re: Störung auf linker radencoder: entwurfsfehler (von Mansfeld - 23.03.2010 16:34) Re: Störung auf linker radencoder: entwurfsfehler (von PepeV - 30.03.2010 10:12) Re: Störung auf linker radencoder: entwurfsfehler (von Mansfeld - 31.03.2010 15:51)