Kinder-Music-Pi

My attempt was to build a mp3-player for my 2.5 years old daughter. No display, no user manual, just big colorful buttons.

Features

• Every button plays all songs in one directory (similar to start playing a whole CD)
• Pushing the same button again, skips to the next song
• with two (black) buttons turn up/down the audio volume (predefined steps and maximum volume)
• White button: pause/unpause
• Auto power off after timeout
• Welcom sound when rapsberry pi is booted an ready to play kinder music

Ingredients

• Wooden box from Ikea
• Raspberry Pi 2
• USB-Powerbank 4400mAh
• bunch of colorful push buttons
• 2 small speakers (from an old pc-speaker set)
• some resistors for the buttons on the gpio
• a small audio amplifier
• one small 3.3 VDC relay
• some lines of python

After a one minute instruction the little girl vanished with the her first mp3 player. Next step: remote control.

Step 1: Wiring Plan

• I'm using an "standard" powerbank with a little switch to turn on and long press to turn off the power
• this little switch is connected in parallel to a relay to be able to power off the system by software
• all 12 switches are connected with a 1k and 10k Ohm resister for debouncing

Step 2:

Attached you'll find the source code