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Thread: Phidgits and electrical questions

  1. #11
    Variable Bitrate 84RegalRider's Avatar
    Join Date
    Nov 2004
    Location
    San Diego
    Posts
    427
    if he does with parallel shouldnt he worry about sending a down command and then manually pushing the up switch causing a blown fuse at least.

    just something to think about even if its rare to happen.
    Core duo
    1tb harddrive
    256 ddr
    8 lilliput
    bu-353

    still installing...

  2. #12
    Constant Bitrate
    Join Date
    Sep 2005
    Location
    Australia
    Posts
    166
    No, if either or both the switches are 'on' the result will be the same. Activating the switch and the relay at the same time is just like having one of the switches on

  3. #13
    Low Bitrate ajscomp372's Avatar
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    Mar 2006
    Location
    Buffalo, NY
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    102
    After taking a second look at my design, I realize that you could use 2 relays per window. In that case, you should hook the relays up directly to the window motor. For this setup, you would have the 30 terminal of each relay go to the window motor, and the 87 and 87a terminals going to 12V and gnd, respectively. This would not cause any problems with the switch in terms of the relays and the switch being on at the same time. I would not recommend hooking up to the switch anyways, since especially in newer cars, the voltage of the switch is essentially unknown unless you use a multimeter. Now that I think about it, there could be problems with this setup if both the switch and the relays are used. Hmm... I guess you could try getting diodes in there somewhere to make sure there are no blown fuses, but then again this problem would be solved with the 3 relays. Of course, I'm no electrical engineer, I'm just a hobbyist, so I would encourage you to get a second opinion. The diagram I listed earlier I just sort of came up with, which is how much of the electronics in my car goes.

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