In this project, we’ll show you how to make a mural which triggers sounds when touching different areas. We created a series of animals that trigger their own sounds. You can easily tweak this project to accommodate your own design using up to 12 different sounds.
Draw the shapes you want on the wall with a pencil. I used a projector to give me some outlines to trace.
Placed the copper tape making sure that where possible you use a single strip. It’s important that where you join together two bits of copper tape you overlap it sufficiently to get a good connection. Make sure that each of your animals has its own separate copper tape connection that does not touch or overlap the other animals’ connections. This is how I laid out my tape. The copper wire is in red, the rectangle in the top left is where the hardware will be placed.
You want to use as few joints between the copper tape as possible. Think of each join as a potential weak connection. The less you have of these the better. Make sure each piece is well stuck down. You can use superglue for any that peel up if your wall has a porous surface.
Check that each of the animal sensors is working by doing the following:
The Touch Board from Bare Conductive is plug and play, but for this mural, you’ll need to upload the code for proximity sensors as we want the sensors to react to the light touch of a baby. Touch Board is programmed using the Arduino IDE which is a free software.
The RX and TX LEDs on the Touch Board will flash and the Arduino IDE will display “Done Uploading” once finished.
We want the mural to be self-contained, meaning that it runs without being plugged to a laptop or socket. The Touch Board has an onboard LiPo charging circuit that charges the battery while it’s powered via a USB cable at a safe rate of 200mA, which also extends the battery’s life. The “CHG” LED will light up when the battery is being charged. It will also automatically stop charging once the battery is full. This is indicated by the orange “CHG” LED turning off.
The Touch Board comes with some preloaded sounds on the micro SD card but you’ll want to load your own. You can record them yourself or get some open-source sounds from something like https://freesound.org/ . Make sure that they are in mp3 format.
TRACK000.mp3 for electrode E0
TRACK001.mp3 for electrode E1
TRACK002.mp3 for electrode E2 etc…
The mural is complete!
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