Used during the show C'est le moment by Transquinqennal as scenic device. Every time someone presses their assigned button, a chronometer triggers. The percentage of time spoken by each participant is beamed on a screen on the back of the scene.
Emergency buttions are wired with XLR cables to the GPIO pins of a Raspbery Pi 4. On this Pi runs a Flask webserver that sends button presses to a webpage in real time, thanks to a websocket. In the future it could be possible to turn the project in a web app where physical buttons could be removed and devices (computers, phones) used both as a button and display screen.
