Bring the productive bustle of ambient coffee shop sounds with you anywhere by building a white noise machine in a cup! This project uses the Adafruit Audio FX Board to play a 30 minute audio file on repeat. The circuit is battery powered with the help of a lipoly backpack, which also allows for convenient recharging over USB and the easy addition of a power switch. A speaker rests inside the lip of the cup, driven by a class D audio amplifier using a 10K potentiometer for volume control.
The Cup o’ Sound requires no programming and is excellent for practicing your through-hole and free-wire soldering skills. The result is a satisfyingly compact handful of portable sound that can be reused in many contexts or rewired to act as a speaker alone.
Before you begin, familiarize yourself with the following guides:
For this project, you will need:
- 16MB Audio FX Board
- half-size Perma-Proto board
- Adafruit Lipoly Backpack
- Adafruit Mono 2.5W Class D Audio Amplifier - PAM8302
- lipoly battery
- speaker
- illuminated on/off button
- 10K potentiometer*
- knob
- button quick-connect wires (optional but handy)
- stranded wire in various colors
- paper coffee cup with lid
- pliers and soldering tools
- panavise
- heat shrink tubing
- craft or utility knife
- awl
- pencil
*Yes, we realize this is a linear taper pot. If you've got a logarithmic one, feel free to use that!
Page last edited February 17, 2015
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