Doug Chevrier
  • Male
  • Albuquerque, NM
  • United States
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Latest Activity

Doug Chevrier commented on Thomas J Coyle III's group ArduRover User Group
"A boat with twin screws has a separate control for each:  Forward and Reverse.  Helps in tight turns.  Driving both with one control, both making the same turns in the same direction, will not do.  We need TWO Throttle Channels."
Feb 22, 2013
Doug Chevrier commented on Thomas J Coyle III's group ArduRover User Group
"It's great that some talented folks are smoothing the way for Rover operation.  There are still a few (not so talented) of us who need a second throttle channel for running boats with twin screws and consider that to be a major…"
Feb 22, 2013
Doug Chevrier commented on Thomas J Coyle III's group ArduRover User Group
"While cleaning up the ArduRover firmware, it would be very helpful for the few of us working with twin screw boats if the Elevator channel could be converted to a second throttle."
Dec 18, 2012
Doug Chevrier left a comment for Thomas J Coyle III
"It would be very helpful for the few of us working with twin screw boats if the Elevator channel could be converted to a second throttle."
Dec 18, 2012
Doug Chevrier replied to Alain Sutter's discussion ArduRover without steering servo in the group ArduRover User Group
"Alain-- A few of us are attempting to do the same thing with boats that have 2 screws.  I've gone into the C++ code in several files, found references to elevators and changed them to copies of the throttle code.  But I'm not a…"
Nov 13, 2012
Doug Chevrier commented on Thomas J Coyle III's group ArduRover User Group
"I got an APM 2.5 with plastic case for my RC boat.  While operating in the boat, the 5V pins must be jumpered to get power from the receiver.  But for programming, the board gets its power from the USB cable.  Since the jumper is…"
Oct 18, 2012
Tom Gibson left a comment for Doug Chevrier
"Doug,  I can only tell you what I have gathered.  I think you will find what you need here.  I have the same thoughts on the second motor.  I have looked over the code myself and had a programmer friend look at it but we…"
Oct 9, 2012
Doug Chevrier left a comment for Tom Gibson
"Tom-- Last Friday I connected my APM 2.5 to my laptop and oggled the flashing lights!  The APM came to life.  Using Mission Planner, I looked thru a list of parameters & commands.  Mission Planner now has an ArduRover…"
Oct 9, 2012
Tom Gibson left a comment for Doug Chevrier
"Doug,   Yes, if you only need two modes you could probably use your B switch fine, as long as it goes to ch8 input.   You're also right about APM passing through in Manual mode.  In Manual, you could use whatever channel for any…"
Oct 3, 2012
Doug Chevrier left a comment for Tom Gibson
"Chris Anderson left a comment that the manuals are linked in the Product Listing.  What I've seen there isn't quite enough.  What are the Eagle Files?  I downloaded them (2) but don't have an app to open them."
Oct 3, 2012
Doug Chevrier left a comment for Tom Gibson
"Tom-- I'm learning a lot about my system setup and about the APM2.5!  The receiver (Futaba FP-R138DP PCM1024) uses only 3 channels, 2 thru 4.  As I mentioned, #5 is connected to the B switch.  #2 is the Elevator & 3 is…"
Oct 3, 2012
Tom Gibson left a comment for Doug Chevrier
"Doug, I can relate to your frustration - it takes a while to learn how to navigate the site with so much information. I think the best place for APM2.5 info is in the ArduPlane Manual, Setup, APM2.x.  Keep in mind that ArduRover was begun as a…"
Oct 2, 2012
Doug Chevrier left a comment for Tom Gibson
"Tom--   I received my APM2.5 with LEAS-6 today.  Problem:  No manual, user or otherwise, and I can't find it on 3DR.  I've seen references to it, and really need something in-depth so I know where to go, what…"
Oct 2, 2012
Tom Gibson left a comment for Doug Chevrier
"Doug-- The Z-Boat and Q-Boat are very similar from what I have gathered - size, control, mission, etc.  I currently have APM2.0 with the U-blox GPS.  Don't even bother with MediaTek!  Haven't gotten an accuracy measurement…"
Sep 20, 2012
Doug Chevrier left a comment for Tom Gibson
"Tom-- I Googled Z-Boat and the pics look like a full sized boat!  My Q-Boat is maybe 6 ft. long and carries no passengers.  Right now it maneuvers via Radio Control.  I think I've decided on the ArduRover APM 2.5, but I'm a…"
Sep 20, 2012
Doug Chevrier posted a status
"I need an autopilot on the boat to interface with the Roboteq motor controller & rudder. Not sure if the ArduRover output is compatible."
Sep 19, 2012

Profile Information

About Me:
Retired DOD Electronics Engineer; ex-Navy & Los Alamos Electronics Tech; current Water Utility Authority Electronics Tech (soon to retire again)
Please tell us a bit about your UAV interest
Have a Q-Boat from OCEANSCIENCE with Trimble GPS & SonarLite SONAR from OHMEX controlled by FUTABA 7CAP transmitter, FUTABA FP-R1380P 8 Channel Receiver (4 are used) & Roboteq AX1500 Digital Motor Controller. The boat has 2 screws & a rudder; used to profile the buildup of mud & silt on the bottoms of some very large settling ponds and grit basins. An autopilot would be very handy to guide the boat in a pre-programmed grid to obtain repeatable position data which is stored on-board in a Brookhouse NMEA 0183 Data Logger.
Hometown:
Albuquerque, NM

Comment Wall (4 comments)

At 8:15am on September 20, 2012, Tom Gibson said…

Doug-- The Z-Boat and Q-Boat are very similar from what I have gathered - size, control, mission, etc.  I currently have APM2.0 with the U-blox GPS.  Don't even bother with MediaTek!  Haven't gotten an accuracy measurement yet but +2.5meters would be great for my purposes.  I am running into the same issue with twin screws.  Just to get started with autonomy I routed the port motor through throttle control and stbd through "rudder" (ch2 in Rover).  So when switched to Auto, for a left turn the stbd prop turns forward and for a right turn it goes in reverse, effectively assisting the turn in either direction.  Haven't been able to fully test how this plays out on the water, but it is just until I figure out how to modify the code to give unified thrust. 

Tom

At 11:55pm on October 2, 2012, Tom Gibson said…

Doug,

I can relate to your frustration - it takes a while to learn how to navigate the site with so much information. I think the best place for APM2.5 info is in the ArduPlane Manual, Setup, APM2.x.  Keep in mind that ArduRover was begun as a modification to the ArduPlane code.  I can't recall where I found Ublox info- you pretty much have to just keep reading and following links to find some things. 

Not sure I understand your switch question.  Rover (and probably other firmware versions) uses a 3-position switch to ch8 and optional 2-pos to ch7, I think. So you set up your transmitter to send output from the switch to whatever spare channel you have on your receiver and then run a cable from that receiver output to the appropriate channel on your APM.  The firmware is expecting the signal at that port and knows what to do with it.  In the case of the 3-pos switch it will set your "flight" mode to Manual, Auto, or whatever else it is configured for in your configuration settings.  A 1.5ms pulse is neutral, 1.0 low and 2.0 high.  So 1.0ms might select Auto, 1.5ms Stabilize, and 2.0ms Manual.  Your B-switch being only 2-pos skips the 1.5ms position.  The settings are in Planner under Configuration>Flight Modes, but they don't show up until you are connected. When I started playing with things I didn't have a 3-pos switch so I just set everything to Manual.

Hope this helps.

Tom

At 6:06pm on October 3, 2012, Tom Gibson said…

Doug,  

Yes, if you only need two modes you could probably use your B switch fine, as long as it goes to ch8 input.  

You're also right about APM passing through in Manual mode.  In Manual, you could use whatever channel for any function as long as the output is same as the input.  Of course in Auto mode APM expects things to be on specific channels.  

I left my GPS inside the box in the boat and it works fine.  Saves running cables and sealing holes, etc!  You should give it a try before going to the trouble of relocating it with extension cable.  

Tom

At 9:44pm on October 9, 2012, Tom Gibson said…

Doug, 

I can only tell you what I have gathered.  I think you will find what you need here.  I have the same thoughts on the second motor.  I have looked over the code myself and had a programmer friend look at it but we couldn't find anything that looked like a throttle command.  Seems like it should be fairly simple once we find it.  You just have to give the opposite PWM value to the second motor.  I have also left a couple of posts asking for direction but no good answer yet. 

At one point I thought it might have been as easy as installing a Y servo cable off APM for the throttles.  That works except that the motors are counter-rotating, so one turns forward and one backward all the time!  (Hence the opposite PWM value above.)  Let me know when you figure it out. :) 

Tom

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