On Monday, February 20, 2012 09:13:46 PM Roland Jollivet did opine: > On 21 February 2012 00:42, gene heskett <ghesk...@wdtv.com> wrote: > > Greetings all; > > > > I got the next generation of that board done today and populated it. > > > > This slot type opto device is a Honeywell HOA2001, a 5 terminal device > > whose basing is marked on top of each tower for the + terminal and an > > E for emitter, or an S for the sensor. The led has a 150 ohm current > > limiter, and a 1N914 type diode for polarity protection in series > > with it. > > > > 1. EVERYTHING rings with a dvm in ohms just like my schematic says. > > > > 2. All polarities of applied voltages are seemingly correct. No smoke > > came out when I powered it up, and I didn't hear any mirrors break. > > ;-) > > > > 3. There is, according to ohms law, 0.0253333333333 amps of current > > flowing through the exciting led, as measured by the voltage across > > the 150 ohm resistor divided by the resistors value. The 1N914 is > > dropping a hair more than 450 mv, and the led is showing about .80 > > volts across it when powered by a 5.13 volt supply. > > > > 4. All logic outputs with the slots open are sitting at about 18 > > millivolts. > > > > 5. Dropping a piece of double sided, copper clad pcb material into the > > slot isn't seen, all 3 logic outputs remain at 17 to 18 millivolts. > > I don't think I can get much more opaque to IR than that. > > > > I probably have my face stuck to a tree and can't see the rest of the > > forest, so I am wondering if anyone else might offer a clue. > > > > I can post the eagle files so you can see what I have, which one(s) > > should it make available on my web page for your perusal? > > > > I just made an 'eagle' subdir in genes-os9-stf,, and put these files, > > generated by eagle-0.6.1 in it: > > [root@coyote Genes-os9-stf]# ls -l eagle > > total 268 > > -rw-rw-r-- 1 apache apache 10892 Feb 12 16:12 1_mystuff.lbr > > -rw-r----- 1 apache apache 1405469 Feb 20 17:36 HOA2001-mechanical.png > > -rw-rw-r-- 1 apache apache 75200 Feb 17 09:55 lathe-encoder.brd > > -rwxrw-rw- 1 apache apache 922 Feb 18 12:52 lathe-encoder.pro* > > -rw-rw-r-- 1 apache apache 170535 Feb 17 09:55 lathe-encoder.sch > > > > Which if I understand eagle well enough, should be enough to reproduce > > this board in your copy free (like mine) eagle. > > > > The only discrepancy I see from the data pdf honeywell supplies, is > > that the emitters forward voltage is shown as 1.6 volts. but I'm > > showing about .8, as if it may be wired bass-ackwards. But the wired > > polarity matches the data sheets + mark on top of the emitter tower. > > Turning it around will of course need a new board made. I blew the > > basing they show, way the hell up and printed it, but they don't show > > polarity, just an A-K marking on the bottom view to the right if you > > turn that scan to landscape. A scan of that is also there, as the > > HAO2001-mechanical.png file above. > > > > Comments please. > > > > Thanks. > > > > Cheers, Gene > > -- > > A digital camera or even a cell phone camera can 'see' IR. Test the > vision with a barebones LED and resistor first. But I'm also not sure > enough light will stray from the encoder to be seen. > > You sure that's 150R and not 1K5? ;-) > > Regards > Roland
They meter at 147 ohms. Thanks Roland. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> I was in a beauty contest one. I not only came in last, I was hit in the mouth by Miss Congeniality. -- Phyllis Diller ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
