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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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