diy electronic techno blinky flashy electromechanicalish sometimes artsy projects from my workbench…
If you are looking for information on purchasing or making your own animatronic skull I have a page with information that you can find here:
There are a few sites that sell completed animatronic skulls but they are pretty expensive. I also have a collection of links for DIY animatronic skulls (and birds) along with a few sources of general DIY animatronic related information.
There don’t seem to be many DIY animatronic web sites around but there are a few pretty active Facebook sites. All of them are private, to help keep down the spam, so you have to request access. These groups are well worth it to find DIY animatronic info:
DIY Animatronics Group – https://www.facebook.com/groups/891805981203854/
Animatronic Builders – https://www.facebook.com/groups/747161395755561/
DIY Halloween Animatronics – https://www.facebook.com/groups/DIYHalloweenAnimatronics/
THE ANIMATRONIC FORUM – https://www.facebook.com/groups/215520962797038/
There are a few options for DIY stand alone controllers that can synchronize audio with servo control (that I am aware of). None of these are off the shelf easy to use but are free and open sourced…
1) Falcon Player – If you create your sequence in Vixen or xLights (both are Xmas lighting sequencing software) you can export the file and run it on a Raspberry Pi running Falcon Player (FPP). This will give you a stand alone controller. If you already have sequences created in VSA you can import them into xLights and then export into a file that Falcon Player can use. FPP/Vixen/xLights are very well supported for lighting control but not so much for animatronics.
2) Lightman’s Servo Controller – This is a Parallax Propeller based 8 channel servo controller. Once you have you audio file loaded you sequence the servo movements via attached pots in realtime in a record mode. You can then play the various sequences syncronized with the audio.
3) Bechele2 – This is a Raspberry Pi based 16 channel servo controller. Again it has a record mode to get the servo motion from an attached joystick and then you can use a player mode to play your sequences with the audio.
I have more information about these and other animatronic controllers on my Animatronic Control page: Animatronic Control Systems
A typical hobby animatronic uses servos. So naturally your control system may only have the ability to control the typical RC servo PWM signal. But what if you have other things like LEDs or motors or…. Or perhaps some pixels. I needed to control some relays from a servo signal and while I know you can purchase such things, I rolled my own with parts that I had on hand. 
I used a Arduino NANO clone and a 2 relay module. This lets me control each relay separately using two of the servo control channels. I used a carrier board for my build but you could make yours a lot smaller if you just solder the wires directly to the NANO and cover it with heat shrink. The circuit is power from the +5V servo power.
While I was working on this I also had the need for controlling some eye LEDs. I wanted to have adjustable colors for these LEDs so I could have used some RGB LEDs but this would have taken 3 control channels (one for each of the 3 colors) and would require some sort of driver for multiple LEDs. Then I thought about using addressable LEDs, a NeoPixel ring was ideal for lighting up the project that I was dealing with. And it would only need 2 control channels.
I again used a NANO and cobbled some code together that lets one servo channel control the brightness and another channel to control the LED color color (all LEDs show the same color). Again I didn`t need to worry about size and it is powered from the +5V servo power.
For more information including wiring diagrams and the Arduino code go to my Servo Project page.
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