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I had made an NE555 timer IC based delay circuit (monostable mode) which keeps output HIGH for 10 seconds when trigger pin is connected to ground momentarily. But what I want is if I ground trigger pin again (momentarily) within the ten seconds, it restart the ten-second timer i.e. start timer again from that moment and keep output pin HIGH for another ten seconds. Any way to do that?

Below is my circuit Diagram.

enter image description here

Update: actually i am trying to replace the Arduino in my motion sensing relay circuit. Arduino is programmed in such a way that if motion is detected it turns relay ON immediately and if motion is not there then turns relay OFF after 1 minute. Also if there is any motion detected within that minute then the timer restarts. I think using Arduino just for that is a waste. Please suggest.

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  • \$\begingroup\$ Use a retriggerable one shot IF. If you MUST use a 555, m8051.blogspot.com/2013/02/… \$\endgroup\$
    – Scott Seidman
    Commented May 24, 2018 at 11:22
  • \$\begingroup\$ Thanks I'll try that circuit. Its not necessarily to be a 555 timer ic if something other work then I'll be fine with that. \$\endgroup\$
    – Rishabh
    Commented May 24, 2018 at 11:41

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