A friend wanted me to modify a toy music player to play her choice of music. I ended up using a Waveshield as an SD card reader, player, and amplifier, a Mintyboost to power the whole thing from the toy’s existing 2xAA cell holder, and an Arduino Pro Mini 328 as the CPU.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.