Haunted Pumpkin Patch (with servos!)

This was a project from last Halloween, but I'm just now getting to posting the build log to my page. Bits and pieces have been previously posted on Halloween Forum/YouTube/Facebook. 

One of my buddies with a 3d printer offered to make me some parts so I was inspired to make a haunted pumpkin patch out of Dollar tree pumpkins hacked to move with servos. 

I designed this hinge to work with a MG90S servo. It’s a common microservo.

With a little hot glue, the curved hinge fits perfectly within a bisected DollarTree pumpklin

Here's the link for the build file on Thingiverse.

 So I spent some time working on my pumpkins. I used a hot knife to cut each one in half with mouth and eyes. Then I used a hot glue gun to mount the servo hinge mechanism and a flicker LED.

I painted the insides black and sculpted some loctite foam into better stems. Then I glued some PVC to the bottom so I can stablilize them in the ground.

Finally I repainted the outsides orange and added a little wash to make the stems pop.

Here’s the final assembled board for the project. Controls six servos with random movements and synchronizes movements with on the board audio player triggered by a PIR sensor. Coded by Arduino IDE.

Here's the final installed project. All of the pumpkins randomly open and close, but when someone walks by and triggers the PIR sensor, they all start laughing.