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Thread: Knight Rider Circuit Help

  1. #1
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    Question Knight Rider Circuit Help

    Hello, I was hoping that someone with more experience could lend me a hand with some tips/instructions.

    Here is what I would like a circuit to do:

    I would like to mount one or two LED bars behind my grill on my black sedan. I want to make a circuit that will power on the LED bar(s) only when the car is off and only for about ten minutes after the car has been off too.

    So when the car is on and running, the lights are off.

    When the car is turned off, the LED bar(s) will turn on and provide 12 volts to flash the Knight Rider LED bar for ten minutes, then turn off (preventing the car's battery from dying). I don't want the LEDs running all night so I heard there is a "relay" or 555 monostable chip, or something similar like that which can allow the LED bar to stay active for only the ten minutes after I turn off the car. I can connect the 12 volts directly to the battery since it's right next to the grill, but I don't know where to connect the power that is on when the car is on. I know the yellow ACC wire from behind the stereo is always on when the car is on, and off when the car is off, but it would be difficult to get to since it would need to be ran into the car through the firewall. Though this might be the easiest way.

    Also, I would like the LEDs to turn off again if I start the car (even if I start the car within the ten minutes after turning it off). I don't want to be pulled over for flashing red lights, ha.

    Please give any help or outlines if possible. Please use detail in a reply as I am not an electronics major. I will use my local RadioShack for parts and will obtain the Knight Rider bar from an internet website.
    If you could use MSPaint or an Image Program and maybe draw up a schematic, I would greatly apriciate that.

    Thank you!
    -Paul



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  2. #2
    Maximum Bitrate redls1bird's Avatar
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    Besides it looking really cheesey, and this being a carpc forum, i dont know how to do it. There are places more suited to help you, like HIDplanet.com forums, under the ledforum. Be aware though, knight rider copying might get you slightly flamed.
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  3. #3
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    I don't know much about the timer relay, but if you restart your car within ten mins and you want the lights to stop, you can wire your standard SPDT automotive relay with the coil on terminal to the "ACC" or "RUN" circuit on your ignition harness, the normally closed terminal to the feed your lights and the common to the load (the lights themselves) and the ground to ground, of course. That way, when coupled with the timer relay, when the car is off, the lights will stay active for 10 mins, but if you restart the car within 10 mins, the lights will shut off.

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    Quote Originally Posted by Cutrara View Post
    I don't know much about the timer relay, but if you restart your car within ten mins and you want the lights to stop, you can wire your standard SPDT automotive relay with the coil on terminal to the "ACC" or "RUN" circuit on your ignition harness, the normally closed terminal to the feed your lights and the common to the load (the lights themselves) and the ground to ground, of course. That way, when coupled with the timer relay, when the car is off, the lights will stay active for 10 mins, but if you restart the car within 10 mins, the lights will shut off.
    Thank you Cutrara, this is a great start


    Quote Originally Posted by redls1bird
    There are places more suited to help you, like HIDplanet.com forums
    Thank you, I will give a look over there too! And I know knight Rider is probably not viewed upon as highly as it was in the past, but it used to be a good show.

  5. #5
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    Do a search for this chip LM3914 and knight rider. You probably find something
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    Constant Bitrate jontz's Avatar
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    Cutrara has the right idea, and what I was thinking is that there are several companies that make relays with timers in them already...Honeywell makes some I think. They stay closed (or open) for a selectable amount of time after power is removed (or applied). Hope this helps!

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    Quote Originally Posted by jontz View Post
    Cutrara has the right idea, and what I was thinking is that there are several companies that make relays with timers in them already...Honeywell makes some I think. They stay closed (or open) for a selectable amount of time after power is removed (or applied). Hope this helps!
    Relays with timers in them? That's perfect! Do you know of a part number or way to locate these?

  8. #8
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    Do a search for this chip LM3914 and knight rider. You probably find something
    That linear bargraph driver won't work to well - I built something like this in the early 90's as a little project, by designing an up/down counter, driving 10 Leds - works much better.

    Should be many circuits out there for an up/down counter though, keep us posted.
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  9. #9
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    I did a bit more research. Here is a relay that I think may do the job. Or be half of what I need. The LED bar itself is pre-made. If I were to connect a constant 12 volts and ground it, it would light the LEDs side to side. All I need is to get power to it when the car is off and for only ten minutes after it is off. This saves me the step of having to design and make an LED bar that "moves" back and forth in a kinght rider fashion.





    When no voltage is applied to the relay coil (car off), terminal 87a is connected to terminal 30. When 12 volts is applied to the relay coil (terminals 85 and 86), the movable contact (connected to terminal 30) is pulled down/in by the electromagnet (coil) so that it physically contacts the electrical contact which is connected to terminal 87. In other words, if battery voltage is applied to the relay coil (terminals 85 and 86) terminal 30 will be connected to terminal 87. The red dashed line shows the path in which electrical current flows from/through terminal 30 to the contact of terminal 87a when the relay coil is NOT energized.



    This should be all I need to have the LEDs power on when the car is off. Not 100% sure where to connect what, but it looks like it should work. I also don't know how and where to install the 10 minute time that would shut the lights off ten minutes after the car is off.

    Thank you guys for all your help,
    Paul.

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