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Revolution Models . CarbonXtreme . Midland Helicopters

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e-Ikarus Piccolo-Eco 8/16 > how to servo reverse
 
 
tryan02
rrProfessor
Location: Canton, Missouri

Yeah Im a newbie I know theres a switch on my TX but I am setting up a eco8 with the mechanical mixer problem is the pitch servo works backwards you would think just flip reverse switch, nope mixer uses a y cable to run esc and pitch servo how to get them to work together is the problem. More throttle more pitch is what I want not more throttle less pitch. so Can like the car motor Im using just reversed + & - can I do the same with a servo black and red?
12-30-2006 Over year old.
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Rob_T
Elite Veteran
Location: Tualatin, OR - USA

It's a dieing art, but it is possible to reverse a servo. The problem is you need to open the servo to do it, and you need to be reasonably capable with a soldering iron as the connections you'll be working on are much smaller than (say) soldering wires to a Dean's connector.

If you think you can do this, then the trick is to reverse both the wires going to the motor (inside the servo) and the wires going to the outer pins of the feedback potentiometer (also inside the servo). Having either the feedback pot or the motor soldered directly to the PCB (with no connecting wires in between) can make the while operation much harder, so some servos are easier than others.

If you're not totally comfortable about trying to do this with a soldering iron, you can buy a device to do it electronically like these. Just scroll down to where it says "servo reversers". There are other products on the market too.


Rob
Eco8, Piccolo Fun, Shogun, HB Elite CP, Trex 450XL CDE, Swift
12-31-2006 Over year old.
 
 
tryan02
rrProfessor
Location: Canton, Missouri

oops

tried reversing servo burned up servo. Switched motor wires and both ends feedback pot not noticing the resister across the + & - of motor was also down around motor case (ground). Servo spun rapidly in one direction got hot and damaged the gearset not sure what happened not seeing a servo schematic be it the resistor shorting the circuit. I would think the servo reverse cable would be the thing to use as I assume it is actually an inverter circuit which would do just that invert the incoming signal.
01-02-2007 Over year old.
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Rob_T
Elite Veteran
Location: Tualatin, OR - USA

It takes more than a simple inverter. Servos respond to a pulse between 1ms and 2ms long. To reverse the servo you need to change the width of the pulse. While you can do this with "simple" electronics, many of the commercial reversing gadgets use a microprocessor chip to measure the pulse width and then create a pulse of the reverse width. (You can do this by subtracting the measured pulse width from 3ms and using that as the new pulse width.)


Rob
Eco8, Piccolo Fun, Shogun, HB Elite CP, Trex 450XL CDE, Swift
01-03-2007 Over year old.
 
 
CoolMax
Heliman
Location: SF Bay Area, CA - USA

Try this one or something similar:

Futaba SR10 Dual Servo Reverser

Sx2 output is reversed signal to servo.

Regards
CoolMax

01-08-2007 Over year old.
 
 
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e-Ikarus Piccolo-Eco 8/16 > how to servo reverse
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