For putting on a live pyrotechnic show check out the FireHero 3 which shoots remotely controlled flames up to 100 feet in the air.
The system is controlled by a Raspberry Pi and an Arduino. A server runs on the Pi and allows a remote computer to control the system. The Pi sends commands over serial to the Arduino, which switches solid state relays that actuate the valves. Vaporized propane creates the fireballs.
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