Basically here is the site it is a short range inferred radar that could be used for a failsafe in case your uav gets close to the ground. However it is slightly bulky but that can be easily modified because it was made for parking cars. This includes a servo with an inferred transceiver or receiver and transmitter separate, i haven't really looked into it very far. If you are board and want to serf the web go to "Hackaday.com". Thats where i found the range finder and is a great place to hack if you want to.
MaxBotix Inc., has released the new XL-MaxSonar products. This product line should solver the problems above relate to noise and not enough acoustic output power. The XL-MaxSonar line has fully automatic real-time background calibration, much higher acoustic output power, greatly improved real-time noise rejection, centimeter resolution, longer distance range measurement, and for some models real-time analog envelope output and various analog hardware gains from 250 to 4000. These improvements result in virtually noise free distance readings for most users. The XL-MaxSonar is avaialbe in both indoor and ourdoor versions.
yes that maybe an idea... getting some readings first and avaraging them as a reading fix... can u post your smoothing code here so that we can check with ours... i am not very good at programming and usually waste my hours writing and debugging few sentences... :) i also use nunchuck in my project and i have a working code moving 2 servos with nunchuck accelerometer at roll and pithch axes... if u want i can post it here for you...
i have the same sensor and planning to use it for autonomous landing assist... i did almost the same tests with u but i used raw values at analog0 of my arduino. i also added a small cylinder 1inch long to narrow the receipt angle... however my ez1 reads 0-320 raw readings.. i wrote a simple code to read the raw value and light a rgb led... val>100 green, 100>val>50 blue and val>50 red... i tested indoors only wandering around my home and had mostly consistent readings. i even tried to smooth the reading by adding a 0.1u cap between analog0 and sensor but this proved to be better first, but after some minutes the cap heats and reaings get to be erroneaus about 20 inches. i am also convinced that i can use this sensor as an assist in autonomous landing...
how quickly does the EX1 update the distance? I tried using Lego NXT ultrasonics a while back with my UGV but they were just simply too slow for anything usefull - so I switched to scanning IR (its an indoor vehicle) which works very well. I have been thinking of hacking one of those laser rangefinders for golfers into a ground proximity detector since I did not think US would be up to the job...
Reto, I think you'll have trouble with the EZ-1 for this purpose. In our testing, it doesn't give reliable results on grass, ground or even carpets--basically anything other than a hard floor. I think you will find it useless outdoors. You might have better luck with the long distance one, but it's expensive and big.
Marcus, I just wrapped a project of using a ultrasonic sensor by maxbotics that has a 255 inch range. Works pretty well but required me to program a filter to get rid of some noise variance.
I'm trying to work with an ultrasonic sensor that speaks I2C.
This should be much smaller and even have more range
then the IR-system.
Pro: It is independent of light and reflection -properties
Con: ...ultrasonic and dogs. Works inly in one direction at a time
well i have been reading that sometimes the sound waves will bounce in different directions and give messed up results
so i think inferred is more reliable but it is only for short range. like an emergency
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Please click this linkt to view more information about the XL-MaxSonar products. http://www.maxbotix.com/uploads/Small_Industrial_Ultrasonic_Sensors...
Best regards,
Scott Wielenberg
Technical Support & Sales
of MaxBotix Inc.
Phone: (218) 454-0766 Ext. 2
Fax: (218) 454-0768
Email: scott@maxbotix.com
Web: www.maxbotix.com
MaxBotix, MaxSonar, EZ0, EZ1, EZ2, EZ3, EZ4 and WR1 are trademarks of MaxBotix Inc.
This should be much smaller and even have more range
then the IR-system.
Pro: It is independent of light and reflection -properties
Con: ...ultrasonic and dogs. Works inly in one direction at a time
so i think inferred is more reliable but it is only for short range. like an emergency
I dont understand though, what does this do that a much lighter and smaller ultrasound rangefinder won't?