project: sound scales swatch
I'm building 20 examples of how I integrated piezo elements into paillette fabric for the Sound Scales dress. Instead of mounting it on fabric, I decided to make the circuit from paper and copper adhesive. To replace the Arduino-generated PWM sound wave, I'm using a 555 IC to drive the sound. I've also integrated a pressure sensor in the circuit, so that the frequency of the sound can be manipulated.
The swatches are finished and ready to be shipped to Hannah in Berlin. Photos below, and I'll put more details on my swatch page on the Summer Camp website.
- fold to connect battery
- press to change frequency
- behind the fabric
- the complete circuit
- close-up of circuit
...and a little video of the functionality...
progress: paper circuits
Twenty circuits - almost complete!
I also cut the Velostat pressure-sensitive film on the vinyl cutter (seen here in black).
design: copper foil circuit
I'm using an astable 555 timer circuit to generate a pulse to create the piezo sound. Because I'll be using adhesive copper foil, the circuit will be single-sided and single-layered. I'm using SMD components to minimize bulk.
Here's my circuit diagram and layout in Illustrator:
- circuit diagram
- cutting layout
I'm using my vinyl cutter to cut the circuit, so can't make the traces too thin. A 2mm minimum seems to be a good rule of thumb. I've also tried to use curves where possible, so that peeling the copper will be easier, plus it's a nice stylistic touch as circuit boards are usually hard angles. In the future, I'll probably try to design the circuit to reduce waste as part of the layout.
- copper foil cut into circuits
- stuck down and soldered