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Digital Servos and APM2

Posted by Brian McGrath on July 13, 2012 at 12:56pm

I have a Y6 running AC2.6 and am using a separate battery (2S/460mAh/25C) to power the APM2.

I've heard that digital servos can draw a lot more current than similarly sized analog servos, but that they provide much tighter control. Is there an issue using digital servos on ports AN10 and AN11 or any recommended limit to the size and power?

Thanks!

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Replies

Brian McGrath July 14, 2012 at 6:20am

Thanks, guys! I appreciate the feedback. I've also received suggestions that I should be using a 3300uF electrolytic capacitor in the power supply to the servos to prevent sag when there is high demend. Have you tried this? Do you suggest using two BECs?
Rob_Lefebvre July 13, 2012 at 1:42pm

I have run 4 digital servos on Outputs 1-4 with my heli, but it's becoming not recommended.

I would recommend building a little servo breakout board. Bring the PWM to the signal pin, and then power and ground for the servos that doesn't go through APM. The ground must be tied to the APM ground, however, in star formation.

Here's a picture of one that I made, which includes a 2803 chip for the LED's, you don't need to worry about that:

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