"The C rating specifies the maximum continuous current a battery can safely deliver. So a 20C battery can deliver 20 x the amp-hour rating of the battery continuously. Batteries often have a rating of say 20C / 30C. The 30C rating…"
Dave's Discussions
Maxbotix XL-EZ0 (MB1200) Sonar Sensor Stops Working At Low Temperatures
Started this discussion. Last reply by MaxBotix Inc Aug 27, 2012. 1 Reply 0 Likes
I've started having intermittent problems with the sonar sensor on my quad. It has performed very well up until recently. It is now winter (in southern Australia). One morning, I flew in…Continue
Tricopter Tail Servo Problems
Started this discussion. Last reply by Duy Pham Dec 10, 2011. 5 Replies 0 Likes
I've built a Tricopter which has worked OK using a KK controller board. Recently, I decided to upgrade to an Arducopter board in the hope of better performance and much greater functionality. …Continue
Dave's Page
Latest Activity
Dave replied to Drew Roberts's discussion Hexa looses all power at half throttle during hand test"You don't give any details of the battery, but it's probably a brownout from low battery voltage because the battery can't handle the current drain.
Get a proper LiPo - say 5AH and 30C."
Dave replied to marcelo's discussion Short indoor flight, landed no throthle but motors didn't stop"Is your throttle PWM going so low that it's triggering failsafe?"
Dave replied to Sakar Mortalatis's discussion Really......"On some motors, the shaft sticks out the bottom by a mm or so. Check that it's not binding on the motor mount.
"
Dave replied to AJEsq's discussion Ardupilot Randomly Loses Control\Stability Resulting In Crash"Not being an expert log analyser myself, I can't help from that side.
However, from the symptoms, it sounds like you might be intermittently losing a motor. Front flip suggests it's perhaps the front motor. One of the…"
Dave replied to Scott Berfield's discussion Does this look right for Sonar?"The cold issue is a known problem:
http://diydrones.com/forum/topics/maxbotix-xl-ez0-mb1200-sonar-sensor-stops-working-at-low
I have a replacement sensor, but it's Spring now so can't check it."
Dave replied to Steven Tisseyre's discussion Calibrating Sonar"The sonar is very sensistive and will see almost anything in the beam - fixed or moving. Mine reacts to a 3-wire fence from about 2m above. If you have anything on the copter that's within the beam - even a wire - the sonar will…"
Dave replied to John Campen's discussion Better Safety Functions"You could connect this to channel 8 of your receiver:
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8833
Use it to switch off the +5V to the APM. That'll kill it!
"
MaxBotix Inc replied to Dave's discussion Maxbotix XL-EZ0 (MB1200) Sonar Sensor Stops Working At Low Temperatures"Hello Dave and the DIY community,
We saw your post and wanted to add a few remarks. During the engineering phase, our sensors are subjected to the full temperature range of -40c to +85c to characterize performance and ensure the…"
Dave posted a discussionMaxbotix XL-EZ0 (MB1200) Sonar Sensor Stops Working At Low Temperatures
I've started having intermittent problems with the sonar sensor on my quad. It has performed very well up until recently. It is now winter (in southern Australia). One morning, I flew in temperatures of around 5C and the MB1200 gave zero output (20 cm) for the entire flight. I went back to the workshop to debug the problem, but it then gave correct readings and nothing I did could provoke any fault. It also continued to operate correctly that afternoon in warmer weather. More recently, I…See More
Dave replied to Jonas Bohlin's discussion RTL: Landing problems"The sonar is very sensitive. Mine reacts to a wire fence from 2m above. You need to be sure the field of view of the sonar is completely clear of anything, including wires.
There's also a possible bug in the sensor that causes it to…"
Dave replied to R_Lefebvre's discussion Is anybody using Motor_LEDS?"Is there documentation yet for the LED code built into the latest releases? If so, can someone point me to it?
I've searched high and low and can't find anything much that makes sense."
Dave replied to UAVOZ's discussion any restriction to use 900MHz freq. for UAV in AUS?? and how to get permission??"Delayed answer but ... yes, we can use the 915 - 928 MHz ISM band with certain power limits, but without any special license.
The 3DR radios have configuration settings to make them legal in…"
Dave replied to Justin Finkle's discussion Throttle controls half backward"Instead of reversing on the APM, set the Throttle to reversed on your transmitter."
Dave replied to Bob Wilkinson's discussion Copter LEDS with APM2?"Try wiring the LED with red to +5V and black to AN7. When the output goes low, the LED will go on."
Dave replied to James Roney's discussion Attopilot 180A"This might explain it: http://code.google.com/p/arducopter/issues/detail?id=430"
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