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I am trying to find or create a relay that provides power when there is a 12v pulse signal that last less than 1-2 seconds but if it receives signal longer than 1-2 seconds then it should stop or not provide power at all.

What I am trying to resolve is I have car that the BCM sends the brake and turn signal to the lights on the same supply wire. I just want to read when it is a turn signal not a constant brake signal.

It would be okay to wait the first 1-2 seconds in order to determine if the signal turns off or will stay constant then it would provide a pulse signal if the signal received turned off.

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  • \$\begingroup\$ a turn signal changes state approximately every 500 ms \$\endgroup\$
    – jsotola
    Commented Apr 10 at 6:20
  • \$\begingroup\$ This seems like a bad idea in the situation where somebody wants to apply the brakes as they approach a turn. \$\endgroup\$
    – The Photon
    Commented Apr 10 at 15:40
  • \$\begingroup\$ The break signal will come from a another wire so I will have that separate already. \$\endgroup\$
    – BonezMedia
    Commented Apr 11 at 16:06

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An on-delay timer will do what you want. If the relay is energised for > preset time the relay will energise. If you get one with a changeover contact you should be able to do any required logic.

Be aware that pulsing the brakes will appear to be a turn signal.

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  • \$\begingroup\$ Yes you are correct! I don't know why I was over complicating it. I understand it will thing a turn signal is when I pulse the breaks the same speed as a turn signal. \$\endgroup\$
    – BonezMedia
    Commented Apr 11 at 16:15

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