I'm a French student who works in apprenticeship at the CITC eurarfid. I'm in charge of the hardware design & prototyping
https://www.youtube.com/watch?v=Nu0JW-F5Rbs With an arduino uno, a bluetooth shield and a relay. Pressure is at 9 bars, a electrovalve (solenoid) launch the inflammable liquid.
https://www.youtube.com/watch?v=bpM0aRySt9E A NFC reader with a PN532 connecting to an arduino nano, a bistable relay (the contact relay 30A) and an astable relay (the ignition relay)