On 21 February 2012 00:42, gene heskett <[email protected]> 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 ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
