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Discussion Starter #1
I don't know much about electronics. But I am trying to figure out a simple hack for the Gemmy head that they were doing the midi hack on. What I have so done so far is cut everything out of the head. I wired the jaw motor through a 10k audio taper potentiometer ran the led eyes straight to the power supply. Which is a 6.5 walwart. I run the walwart through my lightning box. The jaw and eyes are working perfect! but the motor that moves the eyes back and fourth doesn't do right. I have it separate and have hooked it up all kinds of ways. If I hook it up straight it moves a 1/3 to 1/2 of turn. Then it will not move any more. It doesn't work through the potentiometer either. Trying to do something you know nothing about is a great challenge. I can tell you that! But I think I am as far as I can go. If this is the best I can do with it it will be Ok. But would like to have the eyes moving. So any ideas would be great!
 

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Discussion Starter #2
Ok I was giving it one more try. I figured out the eye motor needs to reverse. Is there anything that can cause current to reverse back and fourth on it's own. I'm not going to use a prop controller for this. I had planed on making this my new head for my witch.
 

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I had the same problem, I used a Spirit Ball for my Carny Barker, I just ended up forgeting about having the eyes move, especially after I burned out the LED's in the eyes! SOOOOO, if you haven't already done so, I would suggest wiring a resistor between the wall wart and eyes!
View attachment 4394
 

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Discussion Starter #4
Thanks I think I am going to try and remove the stop. see what happens if I just let the motor go all the way around. I like you prop! I'll get some pics up later. no matter what I come up with.
 

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Discussion Starter #5
OK I took the stop off the eye motor. That got it going, but it draws to much power fro the jaw. So I'll have to try another potentiometer on it. But I don't have one right now. Here is what I have.


 

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gemy hack

I've done a BUNCH of these skulls. I recomend servo motors and a MD24 module from Highly Liquid for MIDI control for a cheep but good solution. I heped design this controller, and it will do logic outs (on or off) or servo pule outs. go to Highly Liquid: MIDI Retrofit & Decoder Kits, DIY Electronics for info. See my gemy skull hacks here YouTube - THEMINDSHAFT's Channel You can drive the mouth motor and eyes with the MSA-t kit from HL as well, but I doubt the string would last long. Use a DPDT relay on the eye motor to reverse polarity to the motor. Use 12V and a 10K resistor for the eye LEDs, and 6V (or 12V with a 5 ohm 2 watt resistor) for eye and jaw motors. I use servos for eye movements, and tiny pneumatic actuators for the jaw movements on mine.

Bill Ehrsam.
 

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Discussion Starter #7
Thanks Bill. I book marked the links. I didn't want to spend much on this project because of some other things I am working on for this year. Mainly improving my lighting and sound, adding detail, to some of last years props that I threw together. I have seen the results of great haunts and learned how important these little things are. I have also learned they cost as much as the props. I have a prop1 and sound board. Next year I want to build a full size Leather Face. I will be attempting using the servos and and air cylinders on that. I have picked up some animatronic dvd's. Do you know any good books that might help? I just started this prop to help me combine motors and air cylinders. To start getting a idea of practical problems I might find.


 

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Discussion Starter #9
Thanks Terra, he is still has a ways to go. Got to do some prints on him for my friends this week end. Before I cover him up.
 

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Brushe, just found this thread. Curious if the pumpkin man is done? Loved him in action in the dark.

BTW Frugal Ghoul, your carny barker is great too.
 

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Discussion Starter #11
Yes I got him finished awhile back. I haven't taken anymore video. I was going to wait till Halloween. My DD is getting married on September 12. The Reception is at my home. So I am not allowed to put out my Halloween yet. Of course I haven't put away the things we leave up year round either.:) But here are some pictures of him.



 

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Wow Bushe looking at him from the front you would never suspect the kind of equipment that's behind him. Very nicely disguised.

Hope your daughter has a beautiful wedding day.
 

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Discussion Starter #13
Thanks, a friend of mine has a ton of ivy, So I am going to make a pumpkin patch and him surrounded with other pumpkins also. So I am hoping at night no one will really notice him until he pops up and starts talking to them.
 
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