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Thread: Convert a flashing signal to a constant signal?

  1. #1
    Raw Wave god_of_cpu's Avatar
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    Convert a flashing signal to a constant signal?

    I'm trying to hook up my OPUS to my alarm system so that it turns on when I arm my car. I want to hook the turn on power line for the OPUS to the alarm light thats activated when the car is armed however, this light flashes on and off when the car is armed I need to make this into a solid 12v signal for the OPUS anyone know how I can do this?
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  2. #2
    Raw Wave
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    The design will depend on how much current you can get out of this flashing signal and how much current you want out off the solid 12V.

    It also depend if the the flashing signal is 12V/open circuit or 12V/0V...or is it just flashing an LED?

    Give us more details.

  3. #3
    Maximum Bitrate BoraXP's Avatar
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    so when you arm your alarm you want your opus to shut down your computer
    and when you unarm your alarm you want your opus to power up?

  4. #4
    Raw Wave
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    so when you arm your alarm you want your opus to shut down your computer
    and when you unarm your alarm you want your opus to power up?


    Yeah I think that make more sense

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    Maximum Bitrate BoraXP's Avatar
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    check out this thread, especially the third post down

    How do latching relays work?

    but this still isnt everything you need, you would need some way of making the flashing of the lights into just a single 12v 'punch'.

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    Maximum Bitrate BoraXP's Avatar
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    and what kind of alarm?
    model and such or even better a link to the specs of it

  7. #7
    Raw Wave god_of_cpu's Avatar
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    Thanks for the replys so far... I will be using a relay that will be open when the alarm is armed and closed when the alarm is closed. This should result in the OPUS getting the power to the turn on switch when unarmed. I hooked a voltmeter up to the charge feeding the lcd light. It is 12v -> 0v when its armed and flashing and 0v when its off so I wont need to covert voltage. The flash blinks every 2.4s.

    I know nothing about electrical engineering, but after a quick stop at howstuffworks.com I mistakenly thought I could just hook up a capacitor that would charge and discharge evenly through the cycling and result in a constant 12v signal. I bought a pack of capacitors and played fun games with electricity, but I can't get them to do anything cool.

    The alarm is the stock alarm on an infiniti G35 coupe. I looked at wiring diagrams and played with the wires on the Body Control Module, but nothing gives a constant signal when the alarm is armed, everything is flashing or serialized.

    Quote Originally Posted by BoraXP
    so when you arm your alarm you want your opus to shut down your computer
    and when you unarm your alarm you want your opus to power up?
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  8. #8
    Raw Wave god_of_cpu's Avatar
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    Here are some schematics from the service manual for the alarm.
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  9. #9
    Maximum Bitrate BoraXP's Avatar
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    Quote Originally Posted by god_of_cpu
    Thanks for the replys so far... I will be using a relay that will be open when the alarm is armed and closed when the alarm is closed. This should result in the OPUS getting the power to the turn on switch when unarmed. I hooked a voltmeter up to the charge feeding the lcd light. It is 12v -> 0v when its armed and flashing and 0v when its off so I wont need to covert voltage. The flash blinks every 2.4s.

    I know nothing about electrical engineering, but after a quick stop at howstuffworks.com I mistakenly thought I could just hook up a capacitor that would charge and discharge evenly through the cycling and result in a constant 12v signal. I bought a pack of capacitors and played fun games with electricity, but I can't get them to do anything cool.

    The alarm is the stock alarm on an infiniti G35 coupe. I looked at wiring diagrams and played with the wires on the Body Control Module, but nothing gives a constant signal when the alarm is armed, everything is flashing or serialized.
    so you located the actual alarm unit and tested the voltages coming from it?

  10. #10
    Raw Wave god_of_cpu's Avatar
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    I tested the actual flashing indicator light at the top of the center console prior to the electronics to covert the voltage to the 1.8volts for the led. (see the first schematic) I don't think there is an individual alarm unit per say... Everything seems to go to the Body Control Module that has about 70 wires going into it controling everything that the car does. I tried tapping into some of the wires there, but couldn't find anything usable that was a constant signal when the alarm is armed or disarmed, it all seems to be serialized or flashing some how.

    Quote Originally Posted by BoraXP
    so you located the actual alarm unit and tested the voltages coming from it?
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