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Light activated switch circuit
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fixit7:
While I am waiting for my pot to come in, I thought maybe this might work.

I have many of the components that it requires already.

https://www.gadgetronicx.com/light-activated-switch-circuit-ldr-ic555/

Could it be modified to set off a piezo buzzer in addition to the led?
Zero999:
Yes, but the buzzer must be a small one: piezoelectric is best. Simply connect it between pin 3 and 0V.
fixit7:
What do you mean by 0 volt?
Zero999:
Ground. In this case it's the negative of the battery, where pin 1 is connected, but this isn't always the case for all circuits. See the link below.
https://www.physicsforums.com/threads/what-does-0-v-exactly-mean-in-an-electric-circuit-mean.803356/
fixit7:

--- Quote from: Zero999 on May 15, 2019, 06:34:31 pm ---Ground. In this case it's the negative of the battery, where pin 1 is connected, but this isn't always the case for all circuits. See the link below.
https://www.physicsforums.com/threads/what-does-0-v-exactly-mean-in-an-electric-circuit-mean.803356/

--- End quote ---

Thanks.

So I would connect pin 3 to the positive lead of buzzer and the negative lead of buzzer would go to ground or negative lead of my power source?

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