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You don't need a computer for this, just a microcontroller.The controller board being used has four relays on it which are fired by remote control.so to get the actuator to move just requires repeated pressing of the corresponding button on the remote. I would like to find a way to have these fire via a PIR or timer, but it is hard to do as it needs repeatdly firing in a short period rather than simply on or off.
My thought would be to hack the controller and link it to a computer somehow so that the computer is sendiing the signal via the remote to the relays. That way you can have all 4 actuators controlled via computer and triggered via PIRs or pressure pads etc.