I'm after a range finder to use on a quad copter for altitude hold; the only one I could find that is well connected with the Arduino is the HC-SR04 module; they are nice but I want something with a range of around 20-30 meters.
Does anyone know of a relatively inexpensive range finder capable of the above range with a sensitivity of at least a meter?
Thanks in advance
Yeah, It's called an OSD with GPS module. I had one on my quadcopter that displayed altitude, velocity, compass heading ,and Home (loc)
If you watch the ALT display in the following video, it STARTS at 49m and goes DOWN as the aircraft goes UP. I don't know what that means. I wouldn't expect the GPS module have an UP SIDE mounting requirement because I would think the altitude is not sensitive to the module orienttation being that the GPS data is computed by distance to Satelite time calculations.
If anyone knows why that is I would be interested to find out.
raschemmel:
If you watch the ALT display in the following video, it STARTS at 49m and goes DOWN as the aircraft goes UP. I don't know what that means.
A GPS needs at least 3 satellite readings to work.
If there are not enough signals I can imagine the math fails ...
Air pressure sensors are used as altimeters, with an accuracy of better than 1 meter. However they have to be very frequently calibrated to take into account changes in the local atmospheric pressure. You might check the DIYdrones forum for discussion on this and other alternatives. http://diydrones.com/forum/topic/listForTag?tag=altimeter