EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: zerocool on August 31, 2013, 03:22:34 am
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Hey guys, new to the forum but a long time watcher! My dad got a car (For me later! I'm 15) and he doesnt like the alarm that came with it, he wanted a simple one that has a wireless remote with a relay receiver hooked up with the dome light and the siren. That part has been taken care of with a 5$ wireless relay switch off amazon. But I dont want it to simply turn on and off a siren, Based off the relay I wanted it to also lock and unlock the doors and flash the turn signal lights. The thing is this is a single channel SPDT relay. The keyfob has a lock and unlock that go together. The wires are all there, but I cant wrap my head around a circuit for this. It has to pulse 1 relay for the lights and the door lock wires are as follows 1 LOCK 2 GROUND 3 UNLOCK , so a single relay wont work for everything. Any help with this is appreciated, mainly because when I start driving this car (1989 Mitsubishi Montero 4X4) will be mine!
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Oh and the lock and unlock have to be pulsed shortly along with the lights, the siren has to stay on until unlocked. And the wireless relay is a latching one but I can set it to be on when the button is pushed and off when not pushed too.
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4 button Keeloq remote control and 2 receivers. 2 buttons are set up as momentary switches and operate the lock and unlock function using the one 2 channel receiver set up as a momentary output, and the third is set up as a latching output and you use the one button to operate the one channel. Most remote receivers have the ability to set the output as either a momentary or as a latching output, and using Keeloq gives you a rolling code which is a little more robust and not prone to false triggering.
If you buy a top end receiver you can set each individual output as either pulse or latching, but will have to add external relays as they only give an open collector output as they are meant to interface with gate and door controllers. 2 simple 2 channel receivers are likely to be cheaper, and they have relay outputs.