X
Advertisement

1,041 questions

1,221 answers

205 comments

779 users

How do I calculate the RC values to control this 555 timer circuit?

1.2K views
0 votes
How do I calculate the RC values to control this 555 timer circuit?

I'm building a device that squirts my cats when they cross in front of a motion detector. It works fine, but the detector runs the squirt motor for too long, so I need to make a timer circuit. I'm new to the 555, so I'm trying to figure out how to calculate R1 and C2 in this schematic to give me an approximate runtime of .5 second. I'd thought of using a potentiometer in place of R1 to give myself some ability to fine tune the pulse from .2-1 second. Here's my proposed circuit: http://i.imgur.com/B76QQGq.png

asked Jul 2, 2013 by email (3,720 points)

1 Answer

0 votes

t=rc time in seconds r in ohms c in farads
answered Jul 17, 2013 by estefan2020 (7,170 points)

Related questions

  • 0 votes
  • 1 answer
  • 1K views
  • 0 votes
  • 2 answers
  • 347 views
asked Jul 2, 2013 by email (3,720 points)
  • 0 votes
  • 2 answers
  • 849 views
  • 0 votes
  • 1 answer
  • 2.1K views

1,041 questions

1,221 answers

205 comments

779 users

Latest Article Comments

36V Battery Level...
"Hi. Can I add a 12 volt relay for alarm on this 24 v batt level indicatator Circuit.any"
Hacking a Camera Shutter with Infineon TLE94112LE and Arduino - Part...
"I really love the hand drawn artwork. I use things like this a lot to help me gather my"
Visualizing Data with...
"@Adam: Let's going on... Processing Overview - https://processing.org/overview/ Artificial"
Talk Over...
"can you tell us about what that components code are ? i'm new at this so i don't know some of"
Visualizing Data with...
"I was not aware of the Processing pakage for plotting. I will have to go and take a look at"
Magnetic Field Sensor...
"Hi I have a practical use for this and was hoping you would be able to supply a schematic"
Arduino RFID Access Control with...
"use this code for check 12 digit rfid code.. int count = 0; "
74LS393...
"Very usefull article. Understanding and interpreting datasheets is not a simple matter. Thanks for"
Temperature Controlled DC...
"What is the VR in the circuit? Please do"
How to Use Switch Mode Power Supplies to Power Your IoT...
"AP8012 PDF datasheet (from AiT Semiconductor Inc."
electroschematics group on facebook
...
  Search 4 million + Products
Browse Products