If you want to save some money, buy the GP2D12 - $13.50 at Acroname.. (in fact, Acroname is the only company I can find that carries them). It is cheaper because it has a voltage output rather than digital. This link is a nice overview of why Triangulation IR sensors are the way to go and the different types of Sharp models.. http://www.acroname.com/robotics/info/articles/sharp/sharp.html ----- Original Message ----- From: "Steve Faulkner" To: Sent: Thursday, December 20, 2001 10:22 PM Subject: Re: [PIC]: PIC IR Proximity Detector ? > Using an IR photo detector you are going to get a LOT of variance in your > distance readings depending on what the light is reflecting off of. A > "triangulation IR" detector like the GP2D02 will be *much* more stable and > consistent in it's measurement, because it actually triangulates the > reflection - like a laser range-finder. > > ----- Original Message ----- > From: "Kevin A. Benedict" > To: > Sent: Thursday, December 20, 2001 8:47 PM > Subject: [PIC]: PIC IR Proximity Detector ? > > > > Hi, > > I am trying to build a PIC IR Proximity Detector, the bascic TX circuit > > is figure 2 on this page >>> > > http://www.rentron.com/Infrared_Remote_Control.htm > > If I add a small resistor (10-330 ohms) between the IR led and gnd, > > it changes the distance the RX circuit detects a reflection from > > (10cm -120cm) > > So, I thought if I add a digital pot instead of manually changing > > the resistor, > > I could make a rudimentary IR Proximity Detector. > > Problem Digikey only sells a 10k digital pot, I was hoping to find a > smaller > > > > one,like <= 1k, anybody know where I could get one ? > > Is their an easier way to do this with a PIC ? > > I already looked at the Sharp GP2D02, but I wanted someting cheaper. > > > > Thanks in advance, > > Kevin > > > > P.S. I am a programmer not an EE, so my electronics background is limited. > > > > -- > > http://www.piclist.com hint: The PICList is archived three different > > ways. See http://www.piclist.com/#archives for details. > > > > > > > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email listserv@mitvma.mit.edu with SET PICList DIGEST in the body > > > -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu