Gary McCray
  • Male
  • Fort Bragg, CA
  • United States
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Profile Information

About Me:

I am the Owner and Author of these advertising-free informative web sites:
Now flying, rolling or under construction:
  • Hoverthings FLIP FPV Pro Quadcopter with Pixhawk, 14" props, KDE 515kv motors, telemetry, Sony AS100V Video Camera, Brushlesss Gimbal and FPV.
  • Custom CF tube H/dead-cat Quadcopter with Pixhawk, GoPro, Gimbal & FPV.
  • Hoverthings FLIP Sport Quadcopter with PX4.
  • ARF DJI FlameWheel 330 Quadcopter with PX4.
  • ARF DJI Flamewheel 450 Quadcopter with APM 2.5.
  • My design: Hanging pendulum style robot with two 26" brushless bicycle wheels.
  • Traxxas Stampede 4x4 Rover with PX4.

Professional History:
  • (Retired) Microcomputer Engineer, Hardware and Firmware.
  • (Past) Lead Editor of DIYDrones APMcopter, APMplane and APMrover wikis.

Please tell us a bit about your UAV interest
  • Reentry into RC Planes 3 years ago.
  • Lots of PIC hardware and C and assembler programming experience.
  • Currently interested in Quadcopter development, robotics, 3D vision, environment relative autonomous navigation, Linux, Beagle Bone, Odroid, TOF cameras and LIDAR.

Hometown:
Mendota Illinois

Latest Activity

mP1 replied to Gary McCray's discussion Need RC PWM signal to 0-5 volts for my robot. in the group ArduRover User Group
"There are numerous boards for arduino that take i2c and support up to 16 pwm outputs. Ive ordered a few and have yet to try one out. http://www.adafruit.com/products/815 ROBOTICS & CNC / ROBOTICS / ADAFRUIT 16-CHANNEL 12-BIT…"
51 minutes ago
Gary McCray replied to Jeff Steeve's discussion Turnagy Talon V@ Carbon project Less Flight Controler
"Hi Jeff, Just a suggestion those 4108 Turnigy motors will run happily on 4S or 6S but I guarantee you they are considerably more efficient on 4S. I would strongly recommend that you just go with a bigger 4S battery than a 6S battery if you are…"
1 hour ago
Gary McCray replied to Gary McCray's discussion Need RC PWM signal to 0-5 volts for my robot. in the group ArduRover User Group
"Hi All, I am looking at the ATTiny solution with DAC suggested by Eric, but have also been thinking about using two small DC ESCs feeding a linear technology dual PWM input DAC as the most off the shelf solution potentially requiring no programming…"
3 hours ago
Swift replied to Gary McCray's discussion Need RC PWM signal to 0-5 volts for my robot. in the group ArduRover User Group
"Sorry forgot, regarding your question if it might be possible to use one ATTiny and 2 of the DACs for a 2 channel device? They answer is yes. The A0 pin on the DAC will do the trick."
4 hours ago
Swift replied to Gary McCray's discussion Need RC PWM signal to 0-5 volts for my robot. in the group ArduRover User Group
"Thanks Gary.  I will contact you."
5 hours ago
Gary McCray replied to Gary McCray's discussion Need RC PWM signal to 0-5 volts for my robot. in the group ArduRover User Group
"Hi Eric, That actually looks like a very nice compact solution and 12 bits is way plenty. I do not think that 25ma would be any problem as it is simply a control signal that is normally supplied by a 5K potentiometer connected 0 - 5 volts. Do you…"
5 hours ago
Gary McCray replied to Gary McCray's discussion Need RC PWM signal to 0-5 volts for my robot. in the group ArduRover User Group
"Hi Chris, That looks like a nice little microcontroller based board that does exactly what I want. I looked for something like this without success on line myself. Unfortunately as of September of last year it looks like it is no longer…"
5 hours ago
Gary McCray replied to Gary McCray's discussion Need RC PWM signal to 0-5 volts for my robot. in the group ArduRover User Group
"Hi Phillip, I am sorry, you are absolutely right, your code with a bit of an RC filter should work perfectly well and you could get by with less capacitor on the faster one. You are basically taking radio control PWM and converting to real  -…"
6 hours ago
Swift replied to Gary McCray's discussion Need RC PWM signal to 0-5 volts for my robot. in the group ArduRover User Group
"Hi Gary, would you consider the usage of at ATTINY85 and a MCP4725 (DAC) a valid solution? The ATTINY would read PWM and send I2C messages to the DAC in order to provide (0-5V) analog (12-Bit Resolution). The ATtiny85 (and it's cousins) does…"
6 hours ago
Phillip Schmidt replied to Gary McCray's discussion Need RC PWM signal to 0-5 volts for my robot. in the group ArduRover User Group
"My program does exactly what you need (as I understand it). Input: RC signal with pulse width variation from 1ms to 2ms Output: PWM signal that varies from 0% to 100% duty cycle (at 490Hz or 980Hz, depending on the output pin used) I'm…"
6 hours ago
chrisa replied to Gary McCray's discussion Need RC PWM signal to 0-5 volts for my robot. in the group ArduRover User Group
"Hey I read the code it looks like it does what you need right>? Did u read the code"
7 hours ago
Chris Card replied to Gary McCray's discussion Need RC PWM signal to 0-5 volts for my robot. in the group ArduRover User Group
"I did a quick Google search for a PPM->analog converter,  and, Maybe  THIS   will work.   It's intended for RSSI and it may have some undocumented characteristics (glitches on power  up / down) that make it…"
7 hours ago
Gary McCray replied to Gary McCray's discussion Need RC PWM signal to 0-5 volts for my robot. in the group ArduRover User Group
"Hi Chris, Yes it is, but this particular controller only has 0-5 volt (5K pot) input or Hall device input which is simply a pulse rate input for a hall device on a pedal sprocket to apply power only when pedaling and for which I have not been able…"
8 hours ago
Gary McCray replied to Gary McCray's discussion Need RC PWM signal to 0-5 volts for my robot. in the group ArduRover User Group
"Hi Philip, The problem isn't the update rate, the problem is that the radio control PWM signal is very different than the classic PWM signal. In classic PWM pulse width simply varies from zero to 100% and a simple RC circuit can easily convert…"
8 hours ago
Chris Card replied to Gary McCray's discussion Need RC PWM signal to 0-5 volts for my robot. in the group ArduRover User Group
"Is the controller from http://kellycontroller.com ?  Because , they seem to have set-up software tools and often there are multiple choices for the type of throttle input..  such as  PWM 0 - 100%   ,  PWM 50/50…"
8 hours ago
Phillip Schmidt replied to Gary McCray's discussion Need RC PWM signal to 0-5 volts for my robot. in the group ArduRover User Group
"If you need a more analog signal, then switching the output to either pins 5 or 6 will increase the PWM update rate from 490Hz to 980Hz (without effecting duty cycle).  Then a weak RC filter should be able to remove a reasonable amount of the…"
9 hours ago

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Gary McCray's Blog

New 1 at a time ESC calibration method for PX4 or Pixhawk

Posted on June 28, 2014 at 2:47pm 3 Comments

One of the Problems with the PX4 / Pixhawk is that it uses a PPM-Sum receiver which when so configured may not work at all for the normal receiver based method of one at a time ESC programming.

And especially so for 4 in 1 ESCs.

The one at a time method I have developed uses the Wikis…

Continue

Drones Are Fun an informational resource for everybody interested in UAVs, especially for personal use.

Posted on May 29, 2014 at 5:25pm 21 Comments

Hi everybody,

Gary McCray here, past wiki editor for DIYDrones, announcing my own Informational Web Site: http://www.dronesarefun.com/

I am very much strong advocate of our APM and Pixhawk flight…

Continue

BeagleBone Black available - if you're quick.

Posted on March 5, 2014 at 11:00am 32 Comments

Hi all, Beagle Bone Blacks are available at Adafruit this morning.

I wouldn't ordinarily put an Advertisement for a product as a Blog but as you may or may not know, Beagle Bone Blacks are seriously hard to come by.

Everybody is out of stock all the time, except a fewy unscrupulous dealers who…

Continue

I Really Need help solving a problem for all of us!

Posted on February 23, 2014 at 7:30pm 94 Comments

We have a great new Wiki / Manual which is actually being I think very helpful for all of us.

But there is a Huge - Seemingly Intractable Problem. At least in my estimation of things:

No the Iris isn't the problem, It's a really great 3DR copter, probably the best one available for the…

Continue

Comment Wall (3 comments)

At 8:14am on February 13, 2013, Jethro Hazelhurst said…

H Gary,

First off, thank you for the superb job on the F330 construction page and wiki table of contents.

I will Email you the Image so that you can put it where you see fit.

Many thanks again!

Jethro.

At 10:49pm on May 21, 2013, Jorge Antonio Saldaña Rosales said…

Hola que tal Gary sabes el hadware que necesito para hacer mi drone Cooperativo

At 5:17pm on May 22, 2013, Michael said…

Hi Gary,

Just a thing on shipping rates (from your comment). I was also mad because of high shipping. I sent support an email and they shipped the parts for free through standard mail! I got it in 2 days ( I live on the east coast). There is a size limit though, can't go above 13 oz, but for small parts its fine. Oh and btw, when you email them, ask for Lorena, it may take a day or 2 more because of her work hours, but she's been amazing with shipping like this.

 

Sorry this is the only way I could contact you!

 

Michael

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