Problems running servos

[Cecil]

I'm not fluent in that language at all, but the first thing I would check is to see if you have a jumper on the pins next to the servo output. Without that jumper, the servo will not get power to move at all.

[omalleyj]

Originally Posted by Cecil

I'm not fluent in that language at all, but the first thing I would check is to see if you have a jumper on the pins next to the servo output. Without that jumper, the servo will not get power to move at all.

I would just add to that: make sure the DSC is getting power, showing the 6V indicator lit, not just the 5V.

Codewise:
Try hardcoding a value and verify that it is (or isn't) hardware. If the hardcoded value works and the code doesn't.
Good luck!

[slijin]

One possible problem is that your servo is unusual and doesn't operate on the conventional signal range. We've encountered this problem before with Parallax servos. As a reference (I'm not sure about the actual DS output), since Hitec servos are the brand that FIRST recommends,

Originally Posted by HITEC

All Hitec servos require 3-5V peak to peak square wave pulse. Pulse duration is from 0.9mS to 2.1mS with 1.5mS as center. The pulse refreshes at 50Hz (20mS).

[feverittm]

Did you remember to connect the 6V jumper for Servo power on the Digital Sidecar?

[smigs]

Hi everyone,

Thank you so much for your inputs (no pun intended

One thought I did have was to make sure the port we are using has a recorded 6 V difference on the DSC which it does. I also did hardcode a value in for the servo and no response. The DSC is also getting power since we have other hardware hooked into it and it is functioning properly with the correct C++ code.

I never thought about the servo not operating in the conventional signal range so that is something to look at. I am new to FRC so I am still learning where things go etc., but I do know some programming so I feel reasonably confident that the code is correct, especially since the analogous code for the motors work fine.

For feverittm: If the 6V jumper were not present, what would happen? In other words, would there still be a voltage difference across the leads?

Thanks everyone for your quick replies.

[Tom Line]

The jumper is what applies the 5 Volt power to the hot pin on the pwm / servo outputs. Without it, the servos get no power.

[Joe Ross]

In your code, change the digital module to 1, instead of 2.

[theprgramerdude]

What Joe said. Module numbers =/= Slot numbers, it's a semantics change this year that chokes people up who haven't followed everything. Once that changes, it should work fine.

[smigs]

Changing the module to 1 did work!! Thank you so much for the help!!