Servo Wiring

Red Sand Robot

Awesome, thank you!

dc42

Whether you need the capacitor at all depends on the size of the servo. What servo is it?

Red Sand Robot

@dc42 Something like either of these, can't remember the exact listing off of Amazon I got them from.

https://www.adafruit.com/product/169?gclid=Cj0KCQjwrJ7nBRD5ARIsAATMxstzXQM3ltsIyAbbzZGCbQgzmdHpIgmKx94lhGbRou-AgeJf_Sjn49EaAveCEALw_wcB

https://www.amazon.com/FPVKing-Helicopter-Airplane-Remote-Controller/dp/B07N2B99B6/ref=asc_df_B07N2B99B6/?tag=hyprod-20&linkCode=df0&hvadid=343191214486&hvpos=1o5&hvnetw=g&hvrand=14170196726056022913&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9033692&hvtargid=pla-744356057742&psc=1&tag=&ref=&adgrpid=64450094290&hvpone=&hvptwo=&hvadid=343191214486&hvpos=1o5&hvnetw=g&hvrand=14170196726056022913&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9033692&hvtargid=pla-744356057742

Red Sand Robot

@dc42 It is a micro servo, 9g weight, 1.5-1.7kg/cm (4.8V-6V) stall torque. Commonly referred to as a 9G servo.

Red Sand Robot

@dc42 So if I took two 100μF and two 10μF capacitors and soldered them together in parallel, and then connected that in parallel with the +5V and GND wires for the servo that should work correct? From what I understand, to find the equivalent capacitance when connecting connecting capacitors in parallel you sum of all the individual capacitances.

A Former User

Tollerances are usually quite loose on capacitors so I wouldn't bother with the 10uF caps. Given the small size of the servo I'd probably just add a single 100uF cap and if the board is stable and doesn't reset when the servo is under load call it done, and add the 2nd cap if its unstable.

edit: but, yes, your theory for equivalent capacitance is theoretically correct

dc42

@red-sand-robot said in Servo Wiring:

@dc42 It is a micro servo, 9g weight, 1.5-1.7kg/cm (4.8V-6V) stall torque. Commonly referred to as a 9G servo.

I haven't conducted any tests with a micro servo. It's quite likely that it doesn't need any extra capacitance at all; but if it does, 100uF should be more than adequate.

The recommendation of 220uF was based on tests I did using a MG996R servo, weight about 58g. I have some 12.5g servos now (HS-70MG) so I'll test a pre-1.04 board with one of those too.

PhoenixSimon

@bearer
Hi
I have seen you have mentioned you can put the capacitor on the motor, on the connector and on the board.
What is the proper and safest way to do this?
I have connected the capacitor to the connector just to try the servo but it doesn't look very professional and safe.
How could I connect the capacitor to the board?
What else would you suggest?

thanks

A Former User

@PhoenixSimon In decreasing order of likelyness:

simply crimp both the servo wire and the capacitor leads into the terminal and maybe add some sleeving on the exposed part of the leads
solder capacitor to the bottom of the board, onto the solder joints of the servo header.
remove the plastic "shroud" for the servo header then wire wrap + solder the capacitor leads onto the bottom of the header pins
solder capacitor to pcb inside servo, 3d print new cover.

PhoenixSimon

@bearer
thank you very much. I highly appreciate your help.