Issue using Ardumoto and the servo lib.

Forum 2005-2010 (read only) Software Troubleshooting
1

Hi,

does anyone knows about an incompatibility between the usage of the Ardumoto shield (which uses pins 10 11 12 and 13) and the attach() method of the servo lib.

I built a small robot powered by 2 DC motors, and I want now to add further functionality by attaching a servo.

The Hardware (and software) works exactly as expected when I'm either testing the DC motors or the servo, separately.

The problem emerges when I try to make them work together. As soon as I use the attach() method - regardless of the pin - one of the DC motors, always the same....for the lack of a better word....goes into a disable status!

...any ideas? Has anyone ever seen the same issue? Is this a known limitation? Can it be overridden even if it means rewriting part of the servo lib?

BTW - I'm using the Arduino Duemilanove and the Ardumoto shield, as stated before

Thanks!

2

The Servo library uses a timer. It is the same one that controls the PWM for pins 9 and 10.

3

Shouldn't I regain control of pin 10 for PWM using the detach() method...being the only limitation the fact that I would not be able to drive both the DC motors and the servo at the same time? ...but this does not seams to be working. Before I try to use PWM on pin 10 I invoke the detach method but nothing changes....

....help would be most welcome!

Thanks