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Old 02-03-2005, 08:51 PM
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automatic doors

ok guys, what i was thinking of doing is rigging my automatic door lock to actually open the door when the unlock button is pushed. Am i way out of my league or can i do this? If i can how do think i would go about making it work? Any suggestions would be great.

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Old 02-04-2005, 07:53 AM
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Should be fairly simple. First get a door opening solenoid like this (many sources). Install it in the door with a pull rod or cable connected to the latch release mechanism that will open the latch when energized but won't interfere with the stock door handles. Next, using a multimeter, find which lead is energized when the lock button is toggled to 'unlock'. Splice into this lead and run that wire to a 12VDC Bosch SPDT 30A relay . Run a 14ga all-time hot lead from the fuse block (horn circuit might be good?) to the relay and from there to the solenoid. The door lock switch powers the relay with low power draw and the relay shoots high power to the solenoid.
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Old 02-04-2005, 11:17 AM
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I would consider installing some sort of safety interlock so that you don't inadvertently bump the switch and open the door while the vehicle is in motion or near other vehicles. Maybe tie into the neutral safety switch or something.
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Old 02-04-2005, 11:27 AM
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Quote:
Originally posted by ckucia
I would consider installing some sort of safety interlock so that you don't inadvertently bump the switch and open the door while the vehicle is in motion or near other vehicles. Maybe tie into the neutral safety switch or something.
Good point! One way to fix that would be to add a second Bosch SPDT relay (they are cheap!) that is actuated by a 'run' circuit (coil?), and in the actuated mode disconnects the power to the solenoid. The 14ga power wire (keep it in the horn circuit - plenty of power and lightly loaded) will run from the door lock relay through the coil relay to the solenoid. Thus the only time the solenoid will actuate is when the engine is off (coil relay contacts closed) and the un-lock button is pressed (closes those relay points).

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Old 02-04-2005, 01:00 PM
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Are there any "smart" relays available?

I was thinking that a better solution would be a relay that required either holding the signal switch down for an extended period, or requiring two successive switch signals in quick succession.

That way, you would be able to override the interlock if you really did want to open the door and the car was running.
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Old 02-04-2005, 01:55 PM
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Sure. Design the circuit w/ a $0.50 micro-processor and you can have the door whistle Dixie, do the windows, adjust your tie, and cook hotdogs!!
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Old 02-04-2005, 02:04 PM
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Mmmm. Hot Dogs...
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Old 02-04-2005, 04:47 PM
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thanks guys that helped out alot
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