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Security Light Relay Switch

Sunwell

Jul 8, 2022
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Jul 8, 2022
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I’m newer to electronics as a forewarning. I’m hoping as a learning project to build a security light. I’ve put together a 5v power supply that bridges from the 120v VCC and tied that to the relay to supply 120v to two lights and can control them with a switch thus far.

To take it to the next step I’m hoping to use a PIR sensor to turn on the lights for a set amount of time and provide a digital led countdown until they turn off. I’m wondering if I can accomplish this with one 555 timer and one controller for then countdown clock. Alternatively, do I control all of it with one IC?

I know PIR sensors have internal cooldowns, but what if I don’t want the cycle to be interrupted and the countdown started again?

Hoping someone would help me think through how to accomplish the logic of the project I’m learning from.
 

Harald Kapp

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Nov 17, 2011
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Have a look at the kind of timer module used in this thread. These combine a trigger input (from the PIR), a timer with or without display and a relay to control the light.
 
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