. .

Threaded View

Previous Post Previous Post   Next Post Next Post
  1. 22-03-2017 #15
    john swift's Avatar
    Lives in merseyside, United Kingdom.
    john swift
    Last Activity: 18-01-2021 Has been a member for 9-10 years. Has a total post count of 257. Received thanks 53 times, giving thanks to others 0 times.
    Hi Kev

    the voltage drop on the printer port pin to 2.8 - 3V is too small

    you should have it dropping to near 0V when the switch closes

    assuming the opto-isolators LED is powered from +5V
    this is what I'd expect for the breakout boards limit switch input

    corrected diagram
    Click image for larger version.  Name: tx14175 bob limit switch supply corrected diagram.jpg  Views: 1305  Size: 337.5 KB  ID: 21214

    (arrow pointed to the wrong end of the 1K resistor on the original diagram)

    John
    Attached Thumbnails Attached Thumbnails Click image for larger version.  Name: tx14175 bob limit switch supply.jpg  Views: 1072  Size: 322.5 KB  ID: 21213  
    Last edited by john swift; 22-03-2017 at 02:20 PM. Reason: add corrected diagram
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Limit switch problem
    By ECCO in forum General Electronics
    Replies: 7
    Last Post: 25-12-2015, 11:28 AM
  2. Another Home - Limit switch question
    By Cube3 in forum General Electronics
    Replies: 6
    Last Post: 26-12-2013, 07:51 PM
  3. Limit and Home Switch Choice
    By Wobblycogs in forum General Electronics
    Replies: 25
    Last Post: 02-12-2013, 06:16 PM
  4. FOR SALE: Z axis with Home/limit switch and Nema 23 3nm
    By Shinobiwan in forum Items For Sale
    Replies: 6
    Last Post: 02-02-2013, 10:54 AM
  5. bounce off home switch.
    By motoxy in forum Machine Control Software
    Replies: 18
    Last Post: 30-08-2012, 12:26 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules