"Spresense e-Violin" is a handmade electric violin controlled by Sony's Spresense. This is a brand new, built-from-scratch version of our previous remodeled e-violin. A new feature is lots of LEDs and the ultraviolet LED control that illuminates the bow hair, dyed with fluorescent liquid.
ELEKIT sells a cute toy grasshopper with solar panels. I used a door vibration sensor, a temperature/humidity sensor, acceleration sensor, and human detection sensor. Also I added a song module taken from Eric Carl’s ‘The Very Quiet Cricket’. This one sends the atmosphere information with BLE and controls home appliances with ECHONET Lite. This development was fun.
“Doubutsu Sentai Zyuohger (JP HP)”‘s transformation item “Zyuoh Changer” is shaped like a cellphone. Therefore we added a real phone ability by Twilio, Raspberry pi, 3G SIM, and Lightblue Bean. It took as long as 3 months to create this. It was a hard work (After published this article, I realized Qiita is not the place to announce this sort of case study.)
There are some LEGO-connectable microcomputer board cases publicly available. The black box in the photo is one of my favorite Raspberry Pi cases. However, there are almost no LEGO cases for batteries!
Therefore, we created a mobile battery case for “Cheero IoT” which is popular for geeks.