I was looking for a gift for my friend’s son, who’s about a year old. I realized that everything I was looking at was just various enclosures with chips that made sound and light…that’s the kind of crap I can do!
So I built a theremin-type thing. It plays notes based on how close you are to its ‘eyes’, which are an ultrasonic distance sensor, and the nose is a small speaker.
Build log after the break.
I prototyped it on a breadboard with an ATtiny85 (the little 8-pin thing). It worked fine, so I slapped it onto protoboard with some female headers so I could plug in and make changes.
The case is made of a 6 inch length of 2×4. I sliced it longways twice on the bandsaw, then bandsawed out a cavity in the middle piece in order to make a box. Two holes for the ultrasonic “eyes” plus one for the speaker “nose”. I jammed a switch on the side and spliced in a 9V battery terminal with a 7805 voltage regulator.
I decided to add an indicator light late in the build, so I spliced a resistor and some thin wire onto this LED and heatshrunk the joint. This got soldered straight onto the board, which quickly became a nexus of solder blobs.
Here’s a video of it in action:
In order to paint and finish it quickly, I stole this dude’s finishing technique and held the piece up with some nails in wood.
The planned art sketched out.
Painting! Dog!Preparing to finish it with spray lacquer, again based on this guy’s technique.
Here’s the finished Pandaphone right before I wrapped it:
Christmas day, time for unwrapping…