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Author Topic: Does Sparkfun's infrared emitter/detector pair work same as Radio Shack?  (Read 1009 times)
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Portland, Oregon, USA
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Hello,

I have a IR emitter/detector pair, the package pair from Radio Shack (http://www.radioshack.com/product/index.jsp?productId=2049723) working on a breadboard wired up in "beam cut" manner pointing at each other. When the beam between the two is blocked an led will light. This works good and the response is very fast; quickly swinging a pencil between them will flash the led as fast as I can swing it.

I purchased the side-looking IR pair from Sparkfun (https://www.sparkfun.com/products/241) ... should I expect that pair to be a drop-in replacement for the radio shack pair? So far it is not; in fact I cannot get them to operate as a pair at all using the same circuit that works for the radio shack pair.

I'm completely new to electronics and admittedly, my interest lies more in programming the arduino rather than building the circuits, so I just hobble together any examples circuits I can find on the internet that meet my needs.

Appreciate any help tips on this topic.
Thanks,
Eric
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Topsham, Vermont USA
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Hi,

These seem like they should work the same.  Recheck the connection / orientation.

Also, substitute the working LED with the new detector, and the new LED with the working detector.

There are lots of applications for these cheap IR LEDS and Phototransistors. And there are reflective versions too. See some possibilities here: http://goo.gl/AvgYf


DISCLAIMER: Mentioned stuff from my own shop...
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Quote
Hello,

I have a IR emitter/detector pair, the package pair from Radio Shack (http://www.radioshack.com/product/index.jsp?productId=2049723) working on a breadboard wired up in "beam cut" manner pointing at each other. When the beam between the two is blocked an led will light. This works good and the response is very fast; quickly swinging a pencil between them will flash the led as fast as I can swing it.

I purchased the side-looking IR pair from Sparkfun (https://www.sparkfun.com/products/241) ... should I expect that pair to be a drop-in replacement for the radio shack pair? So far it is not; in fact I cannot get them to operate as a pair at all using the same circuit that works for the radio shack pair.

I'm completely new to electronics and admittedly, my interest lies more in programming the arduino rather than building the circuits, so I just hobble together any examples circuits I can find on the internet that meet my needs.

Ok, I'm not too familiar with a sparkfun IR Emi/Det, BUT, it may have a built-in carrier frequency that prevents other Emi/Det to intercept the data. With regular Emi/Det from RadioShack, you wont need to include a carrier frequency and just send the data you want.

Again, Im not sure if a Sparkfun Emi/Det is made like that but it could be a possibility.
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There the same as in they work the same the problem is there more able to pick light noise the one's from sparkfun are made to be use in little black box with a slot cut in it to block stray light.
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Portland, Oregon, USA
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Thanks guys; I've already doubled checked the connections and tried numerous orientations, so I've eliminated that aspect.

However, to be80be comment, thats a good point; I will try a low light situation.

Thanks!
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