Hi!
Have got a wish to be able to lock and unlock (from driver's seat while driving) the sliding door separately from the other doors on a minibus and tried to figure out an appropriate way. Have got as far as the scematic shows but then came to a stop. My idea is to cut the original cables to the central locking actuator in the sliding door and allow the signal to go through a couple of changeover-relays instead, but I can not come up with any good way to control the relays when you want to lock or unlock the sliding door separately. As I see it, I would need 2x buttons. A momentary button to give the voltage at the terminals 86 so that the relays pull and then a further DPDT switch so that you can switch the polarity of the terminals 87. It seems a bit awkward having to press both a button and operate a rockerswitch so I have been looking for alternatives but failed to find anything. Would have been great if there was a momentary button that you could push in order to get voltage at 86 and then turning it to lock / unlock. The car remote key will be dominant so the relays may only pull for a short time while locking and then go back so you can use the remote control as usual. I suspect it would be possible to design a smart solution with eg an Arduino, PIC or similar , but this exceeds my knowledge so I would be very grateful if anyone can help me with a good solution.
Have got a wish to be able to lock and unlock (from driver's seat while driving) the sliding door separately from the other doors on a minibus and tried to figure out an appropriate way. Have got as far as the scematic shows but then came to a stop. My idea is to cut the original cables to the central locking actuator in the sliding door and allow the signal to go through a couple of changeover-relays instead, but I can not come up with any good way to control the relays when you want to lock or unlock the sliding door separately. As I see it, I would need 2x buttons. A momentary button to give the voltage at the terminals 86 so that the relays pull and then a further DPDT switch so that you can switch the polarity of the terminals 87. It seems a bit awkward having to press both a button and operate a rockerswitch so I have been looking for alternatives but failed to find anything. Would have been great if there was a momentary button that you could push in order to get voltage at 86 and then turning it to lock / unlock. The car remote key will be dominant so the relays may only pull for a short time while locking and then go back so you can use the remote control as usual. I suspect it would be possible to design a smart solution with eg an Arduino, PIC or similar , but this exceeds my knowledge so I would be very grateful if anyone can help me with a good solution.