Hi, I'm going to use the schema provided here with Arduino, i.e. to replace the given pic with Atmega168 (my choice): http://www.societyofrobots.com/member_tutorials/files/TSOP2.pdf
You can see the schema on this pic: http://i44.tinypic.com/14kiryf.png
I'm confused with the value of C3, please tell me what is that there, the 4.7mk, I think it must be 4.7mF, but then what cap. voltage is preferred? Also, the power of R7 is the question, if to, say, get a 15k ohm?
Also, any comment on the schema is very welcome, to hopefully make a more accurate ir-bumper switch and if possible to use it in series for line follower.