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Really Simple Animatronic Tail: Servo Help
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Really Simple Animatronic Tail: Servo Help

by melarky on Thu Oct 29, 2015 10:14 pm

Wasn't sure where to post this (it uses a trinket, but don't know if this is a trinket problem or a servo problem etc...).

I am trying to get the Really Simple Animatronic Tail project working (https://learn.adafruit.com/really-simpl ... troduction). The project uses the SG92R Micro Servo (https://www.adafruit.com/product/169), but I don't have one of those on hand, and this is for my sons Halloween costume (he switched to wear wolf last minute, thought this would be cool). I do have a SG90 (looks like the SG92R is the upgrade of the SG90). The project page says that it can use other servos, but do you know if this servo will work? I have programmed the Trinket with the supplied code, and wired it up (I am just running it off a 3xAA battery pack I have lying around, and I am currently just testing it out with the power for the trinket supplied through the USB in my computer and then using alligator clips to hook up the servo to the AA battery pack). I have the yellow wire soldered to pin 0, but when I turn on the power to the servo, the servo only moves just a tiny bit at the start, then never moves again. If I turn the battery pack off and back on, it will move again that one time, then stops (I've waited a long time to see if it is just the random timer, but it never moves again).

I am attaching a pic of my setup in case that helps. I don't know enough about this to know whether that servo will work with this project, or if the code needs changed for it, or if my wiring won't work (does the battery pack need to be plugged into the trinket and servo at the same time to work, or can it just use the 5v from my computer and the servo use the 3xAA battery pack to test it out etc...) Any help would be appreciated, would love to get this tail working for my son (we have all of the 3D printing done and have the tail finished and ready to attach, I think I am just going to sew it to the horn arm that is in the picture, the other piece that gets zip tied to didn't fit great, too loose).

ServoTail.jpg
ServoTail.jpg (273.6 KiB) Viewed 371 times

melarky
 
Posts: 14
Joined: Sat May 31, 2014 6:32 pm

Re: Really Simple Animatronic Tail: Servo Help

by melarky on Fri Oct 30, 2015 12:10 am

Ok, I cracked the code, it was the power. I went ahead and wired both the trinket and the servo to the battery pack, and after that, it's working correctly now, and it works fine with this other servo. I don't understand the reason why it works (others here I'm sure know why it couldn't work with the USB powering the trinket and the battery powering the servo), but it does in deed work. Hopefully this will help someone else avoid a little frustration (I'm a beginner with electronics). Just have to finish the tail now and attach it to the servo horn, and we'll be all done his costume!

melarky
 
Posts: 14
Joined: Sat May 31, 2014 6:32 pm

Re: Really Simple Animatronic Tail: Servo Help

by Disciple on Fri Oct 30, 2015 3:07 am

Pictures invited. (c:

Hallelujah!
Disciple

Disciple
 
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Joined: Tue Jan 06, 2015 8:13 pm

Re: Really Simple Animatronic Tail: Servo Help

by melarky on Fri Oct 30, 2015 9:25 am

Yeah, as soon as my son tries the whole outfit on, I want to get some pics and video of it working, I'll try to post some pics here, it turned out great (we stayed up late last night and finished the tail). I made the bionic eye project for my other son (l changed it up a bit for his costume, he is going as Mad Eye Moody from Harry Potter, so he only needed one goggle, so I 3D printed that part instead of using costume goggles etc..). I plan on taking pics and videos of that too, fun project. Glad these are both working now in time for Halloween!

melarky
 
Posts: 14
Joined: Sat May 31, 2014 6:32 pm

Re: Really Simple Animatronic Tail: Servo Help

by melarky on Mon Nov 16, 2015 11:19 pm

Disciple wrote:Pictures invited. (c:

Hallelujah!
Disciple


Better late than never :) I posted an instructable on the wolf costume and it has some pics and videos of it working: http://www.instructables.com/id/Werewol ... Wagging-T/

I also used the Bionic Eye guide (https://learn.adafruit.com/3d-printed-bionic-eye/) to make a Mad Eye Moody costume for my other son (pics and videos at http://www.instructables.com/id/Alastor ... ronic-Eye/). These were fun projects to make and really made the costumes more fun.

melarky
 
Posts: 14
Joined: Sat May 31, 2014 6:32 pm

Please be positive and constructive with your questions and comments.