#✅ - servos not working at all

26 messages · Page 1 of 1 (latest)

graceful sequoia
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Hello everybody.

I have printed the walsh3d ironman helmet v5 and right now, Im trying to make it work the motorization.

Before putting everything inside, I tested the circuit which was working fine using a breadboard.

Then I started putting the servos for the faceplate in the final position and connecting them, checking the position and they were moved correctly together.

By the moment I set the faceplate and testing the final result, looks like servos are not strong enough.

I saw in some other posts that the poqer supply should be at least 5V/2A. So I bought a new one with that specs.

But the result is that faceplate is not getting opened…

Some valuable info…
Faceplate was scaled to 105% and infill 10%
Servos are generic mg90s
Helpers were printed at 100% infill

Any help would be appreciated.

Thanks in advance

IMG_6946.jpg IMG_6947.jpg IMG_6948.jpg
clever raftBOT
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Hey @graceful sequoia, thank you for contributing to this forum.
Please provide as much information (images, video, description) as you can. This will increase the chance that someone can help you with your issue.
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wispy scroll
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As a first guess?

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The servo wires

wispy scroll
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Not much visible but for me it looks like these very fragile cabels were bend once too much

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If you are currently using a powerbank as source. Check if its one that turns the output down after an amount of x time or can only provide the power on 1 connectors of it

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Or maybe you have tiny misallingment but im not sure on that one

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@graceful sequoia if you move it by hand is there any left or right wiggle?

graceful sequoia
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Its a regular connection, but I can try with new ones. Attaching a picture of the wires that are connected to the servos

About the movement by hand… it opens and close clean. There is no any wiggle. It cost a little (to move it up and down) due the servos but the movement is fine.

IMG_6949.jpg
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About the powerbank… Im using in the pin 4 an auxiliar led which is always turn on so powerbank stays connected

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Before that I noticed that after some seconds, the arduino was reset

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So everything went to initial position

wispy scroll
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Hmm

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I remember the nanos dying like flies back when i had an laserengraver due returning current when moved by hand but thats something servos should not do

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About the servos you need to help me there a bit. Are they ones with a slipping clutch and a tiny gearbox right

graceful sequoia
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This is the servo Im using

IMG_6952.jpg IMG_6953.jpg
wispy scroll
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Ah they are "just" metal gear and ballbearings.

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They need 4.8v to work at least. Can you measure the power you give them?

graceful sequoia
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I will have a look and as soon as I have more time and will write back.

Thanks a lot!

wispy scroll
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You are welcome have a nice day 🙂

graceful sequoia
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Good night again.

I have been checking that I have several voltage losses in the circuit with the board. So the servos are getting about 4.67V so I suppose that is not enough. During the measurements I saw the circuit lights flickering, so I guess I'll have to splice the wires better and not use the board to avoid losses.

I will keep the thread open until I do the final tests to rule out if it is a circuit problem.

One more time, thanks a lot

wispy scroll
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No problem 🙂 servo controls etc is something new for me to learn too 🙂

graceful sequoia
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Good morning!

After making changes, at this moment there are no losses. So servos are getting 5V.

Checking the message about the missalignment, I unpluged the helper arms and servos are opening the faceplate as it should be.

So I need to figure out how to fix this missalignment in order to being able to use the helpers.

Thanks a lot for the support ChemicalArgtist!

clever raftBOT