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==Echolocation / Distancing / Lidar== === Sonar === Found several distance sensors, which are one or two sonar transducers on a bit of chip with logic attached. The logic does various things but most will produce an analog voltage corresponding to the distance sensed. '''Parallax PING)))''' -- I don't like this much, it seems very inaccurate past about 3 feet. OTOH it was the first I worked with and I should probably reevaluate it later when I have more experience. '''Maxbotics MAXSonar EZn''' - where n is 0 - 5 or so, a family of sensors with different characteristics. They all have the same behavior, though, basically they'll produce analog OR serial output. In analog mode they can be daisy-chained. These are the smallest ones I've found so far, consisting of only the one transceiver which does both ping and listen. For this reason they can't read closer than 6 inches. * datasheet https://www.noisebridge.net/images/9/93/LV-MaxSonar-EZ0-Datasheet.pdf * someone else's code http://www.flatline.net/journal/2007/12/02/arduino-reading-the-maxbotix-ultrasonic-rangefinder/ '''Devantech SRF0n''' - where n is 1 - 10. I only just found this but it SAYS it has a 3 meter range. And the family claim up to 6m for some of them. There's also a SRF235 which uses 235kHz whereas the rest use 40kHz. One of the family can be daisy-chained; the expensive one I expect. * useful discussion of the family http://www.acroname.com/robotics/info/articles/devantech/srf.html * tech specs http://www.robot-electronics.co.uk/htm/srf05tech.htm * low price vendor http://www.junun.org/MarkIII/Info.jsp?item=94 '''VEX Ultrasonic Rangefinder''' - VEX seems to be a robot system. Part is not cheaper so prolly not worth investigating deconstructing it. http://www.trossenrobotics.com/store/p/5683-VEX-Ultrasonic-Range-Finder.aspx === IR ===
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