I created this sound generating toy for a final in a beginner's Digital Electronics toy. It also changes light colors depending on how you tilt it and vibrates whenever you play a note. I used cardboard, hot glue, paper, and copper tape for the casing. There's an Arduino mega, speaker, accelerometer, RGB leds, vibration motor, and pressure sensor inside (along with the battery pack).
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Step 1: Lots of Buttons
Okay! So my toy has 10 buttons that each generate a different tone. (I use the tone library in Arduino.) I used momentary switch buttons to test out the program, although I ended up using 2 bits of copper tape as buttons in the final rendition.
Here I have each button generating a note through the Arduino and out of the speaker. The pressure sensor changes the octave of each note so users can play higher notes as well.
I also have a few RGB leds paired with an accelerometer. I have the Blue value constantly changing, but the Red and Green values correlated to the x and y axis of the accelerometer.
Step 2: Building a Shell
I built a shell out of cardboard by cutting 12 pentagons with an Xacto knife. I cut out an extra pentagon with a hole for the pressure sensor. On 10 of the pentagons I put copper "buttons" - and modified 4 of the button sides to be windows for the lights. I taped everything together to hold it together, then hot glued the shell together with all the electronics inside.
Here's the code for the toy (it's the .zip file). Since I used contact points for my "buttons" instead of momentary switch buttons, each "button" is actually connected to an analog pin and has a set threshold.
Step 3: All Done
That's how I made my toy. I plan to pull apart the cardboard body and fitz with it a bit more. I'd also like to build it a more stable, long-term body. I'll put an update if and when that happens.