Author Topic: Light activated switch circuit  (Read 1111 times)

0 Members and 1 Guest are viewing this topic.

Offline fixit7Topic starter

  • Regular Contributor
  • *
  • Posts: 216
  • Country: us
Light activated switch circuit
« on: May 14, 2019, 12:49:29 pm »
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?
 

Offline Zero999

  • Super Contributor
  • ***
  • Posts: 20357
  • Country: gb
  • 0999
Re: Light activated switch circuit
« Reply #1 on: May 15, 2019, 09:39:17 am »
Yes, but the buzzer must be a small one: piezoelectric is best. Simply connect it between pin 3 and 0V.
 

Offline fixit7Topic starter

  • Regular Contributor
  • *
  • Posts: 216
  • Country: us
Re: Light activated switch circuit
« Reply #2 on: May 15, 2019, 03:42:38 pm »
What do you mean by 0 volt?
 

Offline Zero999

  • Super Contributor
  • ***
  • Posts: 20357
  • Country: gb
  • 0999
Re: Light activated switch circuit
« Reply #3 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/
 

Offline fixit7Topic starter

  • Regular Contributor
  • *
  • Posts: 216
  • Country: us
Re: Light activated switch circuit
« Reply #4 on: May 15, 2019, 08:12:49 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/

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?

 

Offline Zero999

  • Super Contributor
  • ***
  • Posts: 20357
  • Country: gb
  • 0999
Re: Light activated switch circuit
« Reply #5 on: May 15, 2019, 10:14:13 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/

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?
Yes.
 
The following users thanked this post: fixit7


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf