puzzled, dpdt relay and sensing
Printed From: the12volt.comForum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=130914
Printed Date: May 28, 2024 at 5:41 PM
Topic: puzzled, dpdt relay and sensing
Posted By: midlifez
Subject: puzzled, dpdt relay and sensing
Date Posted: March 14, 2012 at 1:44 PM
Stumped...
Bought some JDM electric folding mirrors for my car. What I wanted, and have accomplished, is for them to automatically fold closed when the car is turned off and automatically fold out when the car is turned on again. So far so good.
I accomplished this by way of a DPDT relay. The mirrors work such that when + and - are connected to the motor one direction they fold in, reverse polarity and the fold out.
What I am wanting do now though is hook up the physicaly switch whic allows manual control of the folding in/out action of the mirrors. What I need is a way to have so that after the car is turned on and the mirror has been unfolded power is cut to it afer 20 seconds. The reason is there is no way to know what position the manual folding mirror switch is in and thus if it had been left in the closed/folding position and the DPDT relay then attempted to unfold the mirror upon turing the car on it would short out. I also thought about putting a DEI 528t spliced in between the ACC source (the yellow wire below) and the DPDT relay where the 528t would then supply power for 20 seconds, the relay would then unfold the mirrors and using another 528t to cut power to the manual mirror switch assembly for 30 seconds. Problem in this scenario is when power is not present at the ACC + line, as would be the case after the expiration of the 20 seconds via the 528t, the DPDT would then fold the mirrors back in..
Some starting points:
1. The manual switch is the one which came with the mirrors and is THE switch which I want to use as it matches the interior, etc.
2. The manual switch is part of other switches (control of mirror angle, etc.) and only receives power when the car is turned on.
3. The manual mirror folding switch has only two functions: A. fold mirrors in or B . reverse polarity of + and - to them which folds the mirrors out
Below is a paint pic I made to show the current function of the DPDT relay:
- Yellow is "accessory" power, i.e. + which is only supplied when the car is on
- Green is constant + power, i.e. always on
- Black is ground
- Brown and Blue are connected to the folding mirror motor and are either + or - depending on which way the mirror is to be folded.
I have the part solved for the power at the manual switch itself; going to use a DEI 528t which will be spliced into the ACC power wire to the switch assemble. When it detects power it will not allow power to pass through until 30 seconds have elapsed.
Any ideas from some electronic gurus? My first post here and yes, have searched...
Replies:
Posted By: KPierson
Date Posted: March 14, 2012 at 4:31 PM
Posted By: midlifez
Date Posted: March 14, 2012 at 5:09 PM
Posted By: howie ll
Date Posted: March 15, 2012 at 4:37 AM
Posted By: howie ll
Date Posted: March 15, 2012 at 4:39 AM
Posted By: howie ll
Date Posted: March 15, 2012 at 4:40 AM
Posted By: howie ll
Date Posted: March 15, 2012 at 5:00 AM
Posted By: midlifez
Date Posted: March 15, 2012 at 6:55 AM
Posted By: midlifez
Date Posted: March 15, 2012 at 7:34 AM
howie ll wrote:
Sorry, I did the original some time ago, newer version!
79C_mirror_fold.bmp
On fold run it to an ignition wire and diode with a 1N4004, band towards the ignition.
On the 528t used to OPEN the mirrors, from the ignition side of your first join, run a wire to the open 528t BLACK/ white, this time cut the loop on that 528t and diode 1N4004 the other way round, i.e. band away from ignition.
This will give you close on turning off ignition, open on turning on ignition. Set the 528t internal timers for 1 second longer than it takes to open or fold the mirrors.
OK, just so I am clear, looking at the last image you posted the connections are as in the image I posted, I enlarged it and labled each connection. Am also confused as I dont see any switch/accessory power connection, i.e. one which is only hot when the car is turned on.
A: Mirror
B: Mirror
C:?
D:Manual mirror switch
E: ?
F: ?
Posted By: howie ll
Date Posted: March 15, 2012 at 10:25 AM
Posted By: midlifez
Date Posted: March 15, 2012 at 12:06 PM
Posted By: midlifez
Date Posted: March 17, 2012 at 11:19 AM
midlifez wrote:
howie ll wrote:
Sorry, I did the original some time ago, newer version!
79C_mirror_fold.bmp
On fold run it to an ignition wire and diode with a 1N4004, band towards the ignition.
On the 528t used to OPEN the mirrors, from the ignition side of your first join, run a wire to the open 528t BLACK/ white, this time cut the loop on that 528t and diode 1N4004 the other way round, i.e. band away from ignition.
This will give you close on turning off ignition, open on turning on ignition. Set the 528t internal timers for 1 second longer than it takes to open or fold the mirrors.
OK, just so I am clear, looking at the last image you posted the connections are as in the image I posted, I enlarged it and labled each connection. Am also confused as I dont see any switch/accessory power connection, i.e. one which is only hot when the car is turned on.
A: Mirror
B: Mirror
C:?
D:Manual mirror switch
E: ?
F: ?
Sorry to be dense possibly, but want to make sure wire up corectly. In the diagram you posted the colors dont match what the 528t has. On the 528t there are the below color wires, which match to your colors in the diagram above?
Colors are:
528T / Your Diagram
ORANGE /
YELLOW / Yellow
RED /
BLACK / Black (ground)
BLACK with White Stripe / Got this one figured out
BROWN /
Posted By: howie ll
Date Posted: March 17, 2012 at 2:40 PM