Experience setting up my own Voice-over-IP phone network, with the aim to have one good way to communicate from desktop & smartphone, over wifi & 3G.
Changing battery turns into detective work.
I wanted to use my smartphone headphones and mic with my laptop computer, so I made an adapter cable to achieve that.
Made an Arduino/RFID/Node.js/Websockets powered real-time check-in/out system for the Taipei Hackerspace, to see better when is someone there so people come visit.
I got a barometric pressure sensor just in time for Typhoon Soulik. Recorded it’s passing and synced it up with satellite imagery for better understanding typhoons.