Servers by jDrones

Landing gear servos not travelling far enough

I am having difficulty with my tarot retractable landing gear, when I takeoff and retract the landing gear to get it out of the way of the camera it will not go far enough/ operate long enough to go all the way to the top and its looks very wonky. I could flick the switch twice to make it go into full retract mode but then the servos does not operate long/far enough to return to its original position, and if the same “flip twice” method is done from full retract the servos travel to far and would impact my gimbal if I let them. Right now I have them set to a good “down” position so that my equipment fits underneath but it looks so wonky when I go to retract them in flight. Any suggestions?

Provide logs and change the SERVO*_MIN_PWM and SERVO*_MAX_PWM parameters.

Otherwise we can only speculate.

If your using a Tarot Retract controller.
Like this one

Your not using a servo. It’s an electric motor only that drives a screw that lifts or lowers the gear.

The controller works by applying a voltage and current to the motor for a fix period of time. The gear in theory should retract in that time and the motor then jams when the gear hits the limit. The time runs out and the power is cut to the motor.

To lower the gear the reverse happens. A reversed voltage is applied, the motor runs in reverse and extends the gear until such time as the gear is down and again the motor jams when it reaches the limit.

The timer cuts out and then the power is turned off.

If the gear isn’t going all the way up then either it’s jamming…not likely or the timer is running out prematurely. There is no fix for that.
Replace the controller.

Again this assumes your using the Tarot controller I showed above.

Somes notes on the subject.
PWM only come into play on this controller to tell the controller, is it up or down you want or if there is no signal then to go to failsafe and lower the gear.

If you get one gear going up and the other down, reverse the wires on the one that’s wrong

Also if you use a Tarot controller for non-tarot gear you might find them retracting slower then normal due to the voltage being applied to the gear. Tarot gear operate around 7 or 8 volts while other gear might need 12 and so they run slow.

Thank you for the info! I am using that exact controller. It came with the 2 landing gears that I bought from EBay, here’s the exact link:

The eBay listing has them branded as Tarot so it doesn’t make sense why the seller would supply a controller that is not capable of adequately controlling the motors. I have the controller hooked up to a mauch 5.35V 3a BEC at the moment, but after looking at the standalone tarot controller it seems as though it’s possible to hook it up directly to the PDB as it’s “maximum voltage” is 26V, and since I run a 6S setup the PDB should never have more than that going through it, but let me know your thoughts. Here’s the link to the listing where I got that info:

If you have it on 5vdc that won’t work. The gear needs 8 volts to run and so 5vdc the motors will stall and time out.
I run mine off of the 6s buss with no issues.


Solved: Directly connected the motor controller to the pdb and that did the trick. Thanks a million!

Glad it worked for you.
Enjoy and be safe…cheers

Servers by jDrones