Servo not moving, Solved

I am having a hard time getting bed autolevel to work, or more specific just getting a sign of life from my servo.

Latest Marlin (as of 3 days ago), Arduino 1.0.5-r2. It compiles and uploads just fine, in Configuration.h I have uncommented:

#define NUM_SERVOS 1

M280 P0 Sxxx
Gives absolutely no response on the servo pin, I would expect to see pulses of xxx mS on my oscilloscope.
uP is brand new, I have tried both pin 11 (PB4) and pin 27 (A4).

Am I missing something, or are there incompatabilities with other features or settings that I am overlooking, PWM maybe?

Edited 1 time(s). Last edit at 03/12/2014 06:24AM by Ralf.

sure there power to the servo

For now I'm testing with a oscilloscope, just looking for signs of life.

It looks like the pin is not initialized, as it goes high if I pull it up with a 10K resistor.

Hmm...

Seems like SERVO0_PIN isn't defined when servo_init() is called..

Skipping all the #if's and just calling 'servos[0].attach(27);' does magic, whereas if I do 'servos[0].attach(SERVO0_PIN);' I get badmouthed.

Will dig a bit deeper..

You also need to uncomment the next two servo defines.

#define SERVO_ENDSTOPS {-1, -1, 0} // Servo index for X, Y, Z. Disable with -1
#define SERVO_ENDSTOP_ANGLES {0,0, 0,0, 96, 180} // X,Y,Z Axis Extend and Retract angles

The 96,180 are my settings for the servo, yours will be different.

Already did that, and the ifdef in pins.h only checks for NUM_SERVOS:

#ifdef NUM_SERVOS
    #define SERVO0_PIN         28
...
...

Which means that the following should evaluate true:

#if (NUM_SERVOS >= 1) && defined(SERVO0_PIN) && (SERVO0_PIN > -1)
    servos[0].attach(SERVO0_PIN);
  #endif

But for some reason, it doesn't.. I don't get it..

Found it.. the servo pin definitions only gets defined when motherboard is set to Ramps and some other boards, not for Sanguinololu.

Wonder why noone have had this problem before me..

Quote
Ralf
Wonder why noone have had this problem before me..

Probably because you're the first one to try hooking up a servo to a Sanguinololu. Or, you're just the first person to post about it online.