remote power on/off
Printed From: the12volt.com
Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=108090
Printed Date: May 21, 2024 at 9:24 AM
Topic: remote power on/off
Posted By: hman567
Subject: remote power on/off
Date Posted: October 11, 2008 at 12:03 PM
Hey guys/ gals I have installed a unit in my car that is on all the time. I would like to be able to turn it off and on, via a wireless remote control switch. Any ideas as to how i would begin to do this? i have the unit hooked up directly to my battery. many thanks in advance
Replies:
Posted By: i am an idiot
Date Posted: October 11, 2008 at 7:19 PM
If the remote control unit has a positive voltage output, connect the red wire of your radio to that wire. If it has a ground output you will neeed to use a relay as shown in the following diagram. 
Posted By: hman567
Date Posted: October 12, 2008 at 6:58 AM
hello Thanks for the quick response. However, i would like to keep this "unit/sensor" on all the time, but when i need to shut it off, i would like a wireless remote button to do this. Do you have any suggestions for a remote as well?
Posted By: impact9
Date Posted: October 13, 2008 at 10:49 PM
I think there's a 3 relay diagram on here (this site) that will do that. It's been nearly 15 years since I did pretty much the exact same thing for a different project. I'd have to draw it out but it only took 3 standard relays, one triggered, second stayed on and the last turned the second one off when the ignition was engaged.
Posted By: KPierson
Date Posted: October 14, 2008 at 6:07 AM
Do you already have the wireless remote switch or are you looking for a part number / suggestion?
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Kevin Pierson
Posted By: hman567
Date Posted: October 14, 2008 at 8:42 AM
No actually. I was hoping for a suggestion!
Posted By: KPierson
Date Posted: October 14, 2008 at 8:47 AM
How much current does the device pull? How often do you need to turn it off? You could go with a cheap keyless entry system or even a basic alarm system as long as it has an AUX output. If you used the keyless system / alarm wouldn't matter, but it would give you a remote, a receiver, and a control channel to switch the load on and off. The only thing that is hard to say is how to do the actual switching. if you use a "standard" autmotive relay (like a Bosch) the current consuption will leave you with a dead battery. If you can answer the questions above we may be able to find a solution. ------------- Kevin Pierson
Posted By: hman567
Date Posted: October 14, 2008 at 9:08 AM
The load is 7w/m2. and the unit i am using is approximately a 1ft squared so, about 1watt or less. i would need to turn it off maybe once a day, then turn it back on. Theoretically, this should not drain my battery unless i dont start the car for a few days, which is highly unlikely.
Posted By: KPierson
Date Posted: October 14, 2008 at 1:48 PM
I calculated about 58mA of current draw based on the info above. You could use a 12vdc reed relay and a standard keyless entry system (with aux output) to do what you are trying to do. ------------- Kevin Pierson
Posted By: hman567
Date Posted: October 17, 2008 at 6:44 AM
Ok, so just hook up a standard keyless entry system, and instead of hooking it up to my locking mechanism, just use the auxiliary output on the module. Sounds easy enough! many thanks for your help!
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