They turned to an Arduino along with some beefy motor drivers. You can see some videos of the beast in operation, below. According to a Reddit post, the brothers picked up a 5A 12V motor but ...

The Arduino code tells ... As the valves use 24V and the motor 12V, standard N-Mosfets and power relays are used for voltage conversion. The remote controller [Gilard] used is actually 20 years ...