Have a look at the 'firestick' at - he gives schematics and parts lists. It does use 40 KHz modulated IR but the parts look cheap and he achieves 200' operation. dwayne At 01:01 PM 8/24/02 -0500, Dale Botkin wrote: >Hi all, > >I'm looking at an object detection problem for which I want to use a >simple, cheap IR LED/phototransistor pair. I plan to have each rigidly >mounted and aimed, say a meter or so apart, and can use a flat black >tubular shroud say half an inch to an inch in length at each end. I could >probably also use an IR filter on one or both ends. In an environment >with high ambient light levels, like outdoors, the sensor would either be >pointed downward or parallel to the ground. Does this sound like it's got >a chance of working most or all fo the time, or is this doomed to fail if >used outdoors? I'd hate to have to resort to using a 40kHz modulated >beam, and I'm not sure that it would make that much difference outdoors. >Who's been here already? This is the first time I've looked at using IR >for a project like this. > >Dale >--- >We are Dyslexia of Borg. >Fusistance is retile. >Your ass will be laminated. > >-- >http://www.piclist.com hint: To leave the PICList >mailto:piclist-unsubscribe-request@mitvma.mit.edu -- Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 18 years of Engineering Innovation (1984 - 2002) .-. .-. .-. .-. .-. .-. .-. .-. .-. .- `-' `-' `-' `-' `-' `-' `-' `-' `-' Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu