I bought a Radio Shack Infrared Alarm unit a few years ago - it's pre-built and has a relay contact as output - and it works on my porch (not direct sun, but indirect sunlight). Comprised of a combo Sender/Rcvr and a special "mirror" placed several to five feet away. Break the beam and a contact closure occurs. Size: about 8 x 6 x 4 inches. More info if interested ... RF Jim ----- Original Message ----- From: "Dale Botkin" To: Sent: Saturday, August 24, 2002 1:01 PM Subject: [EE]: IR object detection > 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 > -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu