My sonar didn't work properly when i first mounted it, it gave a more-or-less fixed reading. I was using 30 mm spacer legs to attach the sonar under the AC2 frame, and these spacers have brass inserts in them for the screws. I suspect the brass inserts were shorting the hole mounts to an adjacent pad, because when I added nylon washers as insulators, the sonar started working.
I have the LV EZ2 version, and it measures down to 21 cm min. (Anything less than 21 cm is still detected but displays as 21 cm).
I also have sonar problems that I put here, but could be useful here too.
this is my info:
LV EZ4 sonar
about constant 340cm reading on test/sonar on CLI no matter where I put
Any other one with sonar problems?
One thing to remember is the datasheet warning:
Each time after the LV-MaxSonar®-EZ4™ is powered up, it will calibrate during its first read cycle. The sensor uses this
stored information to range a close object. It is important that objects not be close to the sensor during this calibration
cycle. The best sensitivity is obtained when it is clear for fourteen inches, but good results are common when clear for at
least seven inches. If an object is too close during the calibration cycle, the sensor may then ignore objects at that distance.
This is the case for all of the LV series, including the EZ0 version. This is actually quite an awkward restriction, because it means you have to hold the Quad off the ground every time you power it up.
Am I mistaken or has the Sonar manual page been recently updated to change the sentence
" the recommended sonar for altitude hold is the XL-MaxSonar EZ0 or the LV-MaxSonar EZ0" to read just
" the recommended sonar for altitude hold is the XL-MaxSonar EZ0"
Just after I have purchased to LV version D'oh!
<-- this is not the case of XL series which calibrate continously realtime.
I understand not to give support to all the hardware but you (DIYDrones) sell that sonar
i was having trouble to, couldnt get it hold , my problem was caused from changing modes to low to the ground
I had the same problem with sonar, was always very noisy even the sonar was disabled I had a rather large deviation in altitude fluctuating. This happens every time the telemetry was connected, if only the USB cable was ok. I managed to eliminate interference between telemetry and sonar cable with small ferrite ring on the telemetry close to XBee. everything is fine now.even if the sonar is started less than 20 cm away from the ground.
the quad is good in manual (stabilize) mode. when i switch it Altitude hold, the quad begins to climb. how do i calibrate my throttle for hover using channel 7.