infrared or ultrasonic

  
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Currently working on an insect robot project. my first robotics project! I`m looking into 2 methods of detecting obstacles i. e. IR and Ultrasound. I cannot seem to choose at this point in time! Can someone give me some guidelines as to which is more reliable and accurate. range is not really a problem. there are lot of limitations in infrared sensors like cannot be used in sun coz of ambient light interference etc. where as ultrasonic
infrared or ultrasonic - schematic

sensors works on sound waves so no problem in detecting obstacle in any case. Infrared will need Tx and Rx placed at diferent points. u can only get the idea of interception at some fixed line angle etc. cause as ajay said they are not reliable. plus they can come from almost any source. i beg to differ on this statement, a highly reliable obstacle sensor can be made with Ir, the fact that even the most modern entertainment gadgets( TV, Music systems, DVD, LCD TVs etc) use Ir technology for remotes speaks about its reliability. at first the TV remotes used ultrasonic technology, but later shifted to Infrared also the fact that Light travels faster than sound helped this transition. at first the TV remotes used ultrasonic technology, but later shifted to Infrared also the fact that Light travels faster than sound helped this transition. yes, that might have also fueled the change, the TV viewer had to strike once on aluminum pipe for TV ON and twice for volume up and thrice for OFF all had to be at correct intervals, this was cumbersome and the designers were desperate to find better alternative and settled on Ir. when it comes to component count, IR uses less components ( 555, Ir Led, Tsop17XX, 3 resitors, a cap) but Ultrasonic requires a lot more ICs and discrete components and requires careful alignment. since the OP wants a obstacle detector for his Insect robot, Ir can also be used (low parts count, low budget) but...



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