Scrolling bubble display on the J&M stand at Derby Maker Faire 2018

Scrolling bubble display

We built a scrolling bubble display!

We showed it on the J&M stand at Derby Maker Faire 2018

12 solenoid valves selectively inject compressed air into channels of twin-wall (polycarbonate roofing sheet) filled with water. An arduino accepts strings of ascii characters over serial, and using the solenoid valves, writes the text in bubbles:

And in slow motion:

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