David Cheney
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  • Mountain View, CA
  • United States
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Interrupt driven sensors; HC-SR04 rangefinder; implementation questions

Started this discussion. Last reply by Felipe Vaz Apr 1, 2013. 2 Replies

I'm attempting to integrate an HC-SR04 sonar range finder into my APM 1.x quadcopter rig. It doesn't really fit into the model used for the other sonar drivers as it doesn't have a analog…Continue

Tags: sensor, hardware, interrupt, rangefinder, HC-SR04

a plethora of ESC problems, beep behavior

Started this discussion. Last reply by David Cheney Oct 19, 2012. 1 Reply

I've just finished building my first quadcopter using a kit that's about a year old (APM 1.x). I calibrated all four motors using the manual method (auto-calibration didn't work) and had one…Continue

Tags: beeps, beeping, beep, quadcopter, ESC

 

David Cheney's Page

Latest Activity

Felipe Vaz replied to David Cheney's discussion Interrupt driven sensors; HC-SR04 rangefinder; implementation questions
"I'm also have some HC-SR04 laying around here. Do you made any advance ? I can help with the coding :D"
Apr 1, 2013
Miguel Martín Mateo replied to David Cheney's discussion Interrupt driven sensors; HC-SR04 rangefinder; implementation questions
"Hi David, I am also interested in that subject. I think it could be possible to adopt the code used in MegaPirateNG for range sensor, but I don't know how specify the board ports and what will be usable to connect the sensor. I am waiting to…"
Mar 6, 2013
David Cheney replied to Scott Berfield's discussion Trouble building ArduCopter code
"See earlier in this thread: a lot of people are not getting successful builds using the ArduPilot build of Arduino. I had the same problem. Using the 1.0.3 standard build from the Arduino site worked for me."
Jan 23, 2013
David Cheney replied to Scott Berfield's discussion Trouble building ArduCopter code
"You can't "download the code from APM" as you suggest. The image on the APM is a compiled binary. The correct thing to do is grab the code from the repository (as you've done) modify it, compile, and upload. You will likely have…"
Jan 23, 2013
David Cheney replied to Scott Berfield's discussion Trouble building ArduCopter code
"cool, that's what I've done as well. seems to compile, guess I'll find out whether it'll fly tonight."
Jan 22, 2013
David Cheney replied to Scott Berfield's discussion Trouble building ArduCopter code
"Is there any resolution on this? I also get these errors when trying to compile with the Arduino.app from ArduPilot-Arduino-1.0.3-Mac.zip on the download site. I also suspected the Exclude Core directive, and I'm about to go downgrade to 1.0.2…"
Jan 22, 2013
David Cheney posted a discussion

Interrupt driven sensors; HC-SR04 rangefinder; implementation questions

I'm attempting to integrate an HC-SR04 sonar range finder into my APM 1.x quadcopter rig. It doesn't really fit into the model used for the other sonar drivers as it doesn't have a analog proportional voltage output, instead it uses a trigger and pulse width. I have three ideas on how to deal with this problem within the Ardupilot/APM framework but I'd really like to run it by someone who knows the system better than me.My three ideas:1. Find a interrupt capable pin that is either currently…See More
Jan 15, 2013
David Cheney replied to Dany Thivierge's discussion Storage/Case for Quadcopter?
"wow, very nice build. I did something similar, except I'm using nested cardboard boxes for all the things. now I feel all ghetto. I have plans to build a carry box with a lipo charging bay made out of something non-combustable  (i.e.…"
Jan 11, 2013
David Cheney replied to Knuckles904's discussion Open pins on apm/oilpan
"I wonder if I can hijack pin 2 and use it for an (input) interrupt. will bad things happen if I do this?"
Jan 2, 2013
David Cheney replied to herve pellarin's discussion ultrasonic HC-SR04 suitable for arducopter?
"short answer: no. long answer: check back in about a month and I may have a solution for you. or someone may have done it already and I simply haven't been able to find it. I currently have a testing problem as I broke one of the motor mounts…"
Jan 1, 2013
David Cheney replied to herve pellarin's discussion ultrasonic HC-SR04 suitable for arducopter?
"though it may be less accurate, it is the fastest output to read. It also requires fewer pins. And in this particular case the HC-SR04 doesn't have a digital output, it's just analog in the time domain."
Dec 28, 2012
David Cheney replied to herve pellarin's discussion ultrasonic HC-SR04 suitable for arducopter?
"also, this deserves a cross reference here I think: http://www.multiwii.com/forum/viewtopic.php?f=7&t=1033&start=80"
Dec 28, 2012
David Cheney replied to herve pellarin's discussion ultrasonic HC-SR04 suitable for arducopter?
"I'm working on a solution for this. The current MaxsonarXL implementation uses a generic analog source reader with a default median filter. The interface returns centimeters, so a simple wrapper around i.e. the New-Ping library might work, but…"
Dec 28, 2012
David Cheney replied to David Cheney's discussion a plethora of ESC problems, beep behavior
"finally found the data sheet in the store pages: http://stuff.storediydrones.com/ESC%20Manual.pdf "
Oct 19, 2012
David Cheney posted a discussion

a plethora of ESC problems, beep behavior

I've just finished building my first quadcopter using a kit that's about a year old (APM 1.x). I calibrated all four motors using the manual method (auto-calibration didn't work) and had one successful test run where all four motors responded to throttle appropriately. I then attached the props, went outside, and tried for my first takeoff, but I have not been able to get all four motors to arm/spin up.* One motor works great, as soon as the APM boots it's ready to go and responds to throttle.*…See More
Sep 30, 2012

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Please tell us a bit about your UAV interest
15 years ago in college I was a member of our aerial robotics team at UCSD competing in the IARC competitions with an RC helicopter. Last year I got a quadcopter kit and now I'm having fun mostly imagining what I can do with it.

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