Camera servos too slow, help please

[mluckham]

Try these:

- disconnect the servo linkage so the servo shaft is free and see if the unwanted motion continues. If it doesn't, the servo shaft was probably rotated too far when you pressed the round plastic servo arm onto the shaft, and your code is trying to drive it past the internal stops.
- try a different PWM cable
- try a different servo
- if your PWM cable is very long, it might be picking up electrical noise - use a clamp-on Ferrite core to solve this (similar to Digikey 445-2038-ND) http://www.tdk.co.jp/tefe02/e9a15_zcat.pdf. You might find something similar at Radio Shack.

[JohnC]

Originally Posted by mluckham

- disconnect the servo linkage so the servo shaft is free and see if the unwanted motion continues. If it doesn't, the servo shaft was probably rotated too far when you pressed the round plastic servo arm onto the shaft, and your code is trying to drive it past the internal stops.

That reminds me of how I "tared" our camera servos. I plugged them into the RC before building the camera mount, then set the pan servo to PWM=124 and the tilt servo to PWM=144. (These are the default center values in Kevin's cam code.) I then removed them from power so they'd stay in that position and built the cam mount.

Since you already have the mount built, if you think setting resetting the servos to allow more useful angle might help, just remove the retainer screws on the servos and lift the "PT-HORN" off. Then you'll probably want to remove the whole PT-MNT piece also. Then run code to set the PWM values I said above, remove power, and add the PT-MNT at whatever angle you want and rotate the PT-TILT-BRK however you want. Press them back onto the servos and replace the retainer screws.

(I got the "PT-HORN" type names from the official Mount Assembly instructions)

[Lablabla]

Thank you all,
I will check it out tmw at school and let you know how it worked

[Lablabla]

Well,
I've done that, and during the search mode it did infact moved faster.
but when it spotted the green light, its movement were so slow we could bearly move the target without the camera losing track of it
Any ideas?
Thanks,
Carmel

[Kevin Watson]

Originally Posted by Lablabla

Well,
I've done that, and during the search mode it did infact moved faster.
but when it spotted the green light, its movement were so slow we could bearly move the target without the camera losing track of it
Any ideas?
Thanks,
Carmel

The servos can't generate a lot of torque, so make sure you built the pan/tilm mechanism per the instructions and didn't over-tighten the fasteners. You'll need to disconnect the servo from the linkage to see how freely it moves.

-Kevin

[Lablabla]

Hi,
I don't think so,
cause when we checked for momvment using the joystick, the servos moved great, and also in the searching mode they move great. only when it spots the light it slows down.
Carmel