I don't get it... I have already bought 6 opto endstop, and i didn't managed to make any of them work. I have replaced them with conventional and simple contact switch. https://reprap.org/forum/read.php?13,22654,22654#msg-22654 Tue, 21 Apr 2026 06:09:35 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?13,22654,24580#msg-24580 https://reprap.org/forum/read.php?13,22654,24580#msg-24580
The Sensors will be made of a material with similar properties to the ICI 962 perspex. This is a special black perspex that effectively filters out all other light except the required IR. I used vacum formed 962 for high resolution IR touch screens around 1980-1984 1024 x 976 using a 64180 processor to perform two simultaneous equations on the averaged shadows of the all the IR beams from both axis using wide angle IR transmiters and recivers on 9" 14" and 21" monitors.
By using this method of calculation, a two finger interlock touch control was possible and used by the CEGB and other customers.]]> BodgeIt Controllers Sun, 28 Jun 2009 03:57:45 -0400 https://reprap.org/forum/read.php?13,22654,24576#msg-24576 https://reprap.org/forum/read.php?13,22654,24576#msg-24576 nophead Controllers Sun, 28 Jun 2009 02:49:17 -0400 https://reprap.org/forum/read.php?13,22654,24575#msg-24575 https://reprap.org/forum/read.php?13,22654,24575#msg-24575
A normal straight though cable probally would have worked.]]> freds Controllers Sun, 28 Jun 2009 01:06:53 -0400 https://reprap.org/forum/read.php?13,22654,24568#msg-24568 https://reprap.org/forum/read.php?13,22654,24568#msg-24568 labmat Controllers Sat, 27 Jun 2009 23:49:45 -0400 https://reprap.org/forum/read.php?13,22654,24561#msg-24561 https://reprap.org/forum/read.php?13,22654,24561#msg-24561 They are very simple circuits so should be relativly simple to test.

Simple test to see if the emiter half of the device is working.

Apply power the opto end stop to be tested now take any kind of digital camera or video camera or mobile [Cell] with a camera look at the emiter end of the device the little V slit in the plastic of the inner face using an electronic camera you will see a bright light if it is working [transmiting infrared light] to check your camera point your TV or Hifi remote at your camera holding a key down. Cool trick..

Ok if its not alight its either wired incorectly at the RJ45 connector or the series drive resistor is the wrong value this should be redredbrown or 220 Ohms.

As the device is a diode even if you have had it wired incorectly once connected corectly it should work.

The only case where the IR led will not work would be if the resistor is less than 220 ohms or short circuit then it could have been cooked or the connection to the diode is shorted sulution remove the short.

By now you should have 50% of the device working.

Now find some material like a thin picee of tin or cardboard to block the IR beam check with the camera to be sure you have blocked the light.

On the new opto isolator boards there is a led that will indicate the gap has been blocked. If this led fails to light.

It could be several problems.

1/. The indicator led is in backwards they only work one way round if its in the wrong way round take it out and turn it arround.

2/. The Led is shorted out with solder remove extra solder between led pins.

3/. Like the infrared led on the sensor the indicator led has a series resistor this needs to be the correct value and not shorted out.

4/. One of the three pins on the opto sensor is shorted to one of the other pins.
remove the short.

5/. Check that the RJ45 connection has not got any shorts on the board. Remove any shorts

In theory by now the device should be working test it using the Aurdrino to read the state of the output pin.]]> BodgeIt Controllers Sat, 27 Jun 2009 20:43:01 -0400 https://reprap.org/forum/read.php?13,22654,24545#msg-24545 https://reprap.org/forum/read.php?13,22654,24545#msg-24545 NewPerfection Controllers Sat, 27 Jun 2009 12:21:06 -0400 https://reprap.org/forum/read.php?13,22654,24158#msg-24158 https://reprap.org/forum/read.php?13,22654,24158#msg-24158 -------------------------------------------------------
> on the first 3, the indicator led was allways
> on... On the last 3, the indicator led was allways
> off... we even bought 3 new sensors to try to find
> the problem. the solution was found only with the
> contact switch...

I have the same problem with my opto switches. None of the 6 works. Could you tell me what type of switch you used and how you wired them to the stepper boards?]]> Andre Controllers Thu, 11 Jun 2009 21:17:19 -0400 https://reprap.org/forum/read.php?13,22654,22656#msg-22656 https://reprap.org/forum/read.php?13,22654,22656#msg-22656 pctr Controllers Mon, 06 Apr 2009 11:47:03 -0400 https://reprap.org/forum/read.php?13,22654,22655#msg-22655 https://reprap.org/forum/read.php?13,22654,22655#msg-22655
Your saying the that the indicator led is also not working, or you just can't see them in the software?]]> freds Controllers Mon, 06 Apr 2009 10:22:07 -0400 https://reprap.org/forum/read.php?13,22654,22654#msg-22654 https://reprap.org/forum/read.php?13,22654,22654#msg-22654 pctr Controllers Mon, 06 Apr 2009 09:52:53 -0400