IR emitter receiver with analog output

Community Projects
1

I’m wanting to use a pair of IR emitter / receivers with analog output to measure opacity of different materials. I was looking at:

https://www.sparkfun.com/products/241

and

https://www.sparkfun.com/products/9349

I’m trying to locate a breakout board or schematic to get the analog voltage output. Any ideas?

2

Look at the “applications” on the product page for the 1’st emitter/detector pair you linked to.

http://www.reconnsworld.com/ir_ultrason … temit.html

3

Wow … sorry about that. Should of seen it.

Thanks!

4

Do a search across the forums here as there was a very similar discussion just a few months ago. And one some longer time go as well. There are several “gotchas” associated with the too simplistic scheme above. I wish I could recall the scientific instrument name mentioned as that would narrow the search down quickly.

5

still need the usual 38KHz carrier so the receiver can be narrow band and can ignore background IR that is not part of the measurement.