The “Twi Writer” is a twitter visualization project that allows users to temporarily write messages on phosphorescent boards using 400nm lasers.  This unique spectrum charges the phosphorescent laser instantly and spells out messages similar to how plan would sky write.

The project uses and arduino micro controller, 15 laser pointers and a remote power source.  All of the computing happens on a mac laptop running processing and communicates with the arduino via serial over usb.