INDEX
RANGE FINDING: http://www.roboticsindia.net/modules.php?name=Forums&file=viewtopic&t=148 SONAR http://www.leang.com/robotics/info/articles/minison/minison.html
About the range of IR sensor http://www.triindia.co.in/forums/viewtopic.php?t=12 http://www.triindia.co.in/forums/viewtopic.php?t=4 http://users.triera.net/zupanbra/senzor.html
Photo Diode
http://www.multyremotes.com/IRSw.htm http://www.roboticsindia.net/modules.php?name=Forums&file=viewtopic&t=410 http://www.windowschallenge.com/Final%20Reports%5CFINAL%20REPORT-FINAL.doc http://www.robotroom.com/Infrared555.html http://www.students.uwosh.edu/~piehld88/laser.htm http://www.wanyrobotics.com/distance.html #
http://www.radioelectronics.com/info/data/semicond/photo_diode/photo_diode.php http://en.wikipedia.org/wiki/Photodiode http://www.lasermate.com/PR.htm http://electron9.phys.utk.edu/optics421/modules/m4/photodiode.htm
LDR
http://www.technologystudent.com/elec1/ldr1.htm http://www.kpsec.freeuk.com/components/other.htm http://www.mstracey.btinternet.co.uk/technical/Theory/theorysensors.htm http://www.tpub.com/neets/book7/26g.htm