ArduRover User Group

Dedicated to the exchange of useful information between members using the Arduino or other families of processors for autonomous rovers.

Members: 365
Latest Activity: 17 hours ago

Before Posting an Issue

Hi All,

Before posting an issue or a problem in the ArduRover Discussion Forum, please check the wiki table of contents, review the firmware release notes in the subforum, and search that subforum for existing answers to your question. Help avoid duplicate threads by finding other members with the same issue and their solution.

When formulating your post, use a descriptive title such as "rover will not navigate to waypoints in the Auto mode" (not "HELP!" or "Problem").

Please include the following information to help diagnose your query:

  • Describe the problem you are having. What is the expected verses the observed behavior?
  • Provide hardware information such as the brand and version of your autopilot, GPS, radio, and compass, as well as any other pertinent details about your rover setup.
  • What version of the APM: ArdurRover2 firmware version are you running?
  • For navigation issues, provide your tlog and/or dataflash log. Click here for instructions on retrieving a dataflash log.


Discussion Forum

new PIXHAWK APM will not do anything in Auto Mode

Started by heliboy. Last reply by Thomas J Coyle III 17 hours ago. 7 Replies

Hi All:Decided to bite the bullet and upgrade to PIxhawk. Got everything and everything went smoothly.Used Futaba sbus link from RX to PixHawk. Works fine. CH1 CH2 for speed and steering CH7 - learn…Continue

How to Install Dual Sonars on a Pixhawk

Started by Thomas J Coyle III. Last reply by Thomas J Coyle III 18 hours ago. 16 Replies

Hi All,I just completed installing dual Maxbotix MB1240 sonars on one of my Pixhawk equipped rovers.Since the sonars were from an APM equipped rover they already had single pair shielded cables…Continue

Tags: install, Pixhawk, dual, sonar

Motor activation in auto mode

Started by Raimo Noormaa. Last reply by Raimo Noormaa 21 hours ago. 8 Replies

Hi, I'm having problems with activating motor in auto mode. All works well in manual and learning mode. When I activate auto mode with "flaps" 3 pos switch, steering servo starts to move, MP shows…Continue

Need RC PWM signal to 0-5 volts for my robot.

Started by Gary McCray. Last reply by Swift yesterday. 36 Replies

Hi,I am building (slowly) a 2 wheel hanging pendulum robot that uses 2 26" Bicycle wheels and Kelly reversing controllers.The problem I have is that the controllers use a pot or 0-5 volt input for a…Continue

Tags: RC, PWM

Comment Wall


You need to be a member of ArduRover User Group to add comments!

Comment by Thomas J Coyle III on October 1, 2012 at 4:49pm

Hi all,

I think that I can answer my own question. The guy who claimed that the new UBlox GPS cables were wired wrong was blowing smoke. The cables and the pinouts are the same for the APM1.4 and the APM2.5.



Comment by Thomas J Coyle III on October 1, 2012 at 4:37pm

Hi all,

I am about to attach my new UBlox GPS to my APM1.4 and I have a question!

Is the pinout on the APM2.5 GPS connector the same as the one on the APM1.4? There has been some discussion that the GPS cables that came with the new UBlox GPS are not wired correctly. Comments?



Comment by KM6VV on September 26, 2012 at 10:15pm

Yes, I'd like to study more the approach of sending the output of an APM into an arduino or other uP.

I'd like to modify the APM code to send numeric values for the direction vector (speed and heading), instead of a pair of PWM signals.

Probably also want a way to download waypoints, which should already exist.  But it would be easier coming from my uP, rather the the coarse planner.


Comment by Randy Brazeau on September 26, 2012 at 6:51pm
@ Niall
You should start a discussion on this topic. I'm interested in this topic as I need to take the output of the APM to drive my rover. My motor controller uses serial communication which I have working with an Arduino mega.
Comment by Niall Dempsey on September 26, 2012 at 5:21am

@ Thomas

Found the problem, needed a common ground between APM and Arduino

I've also got a slight problem with the Mission Planner. A lot ot the time it seems to think its an ArduPlane instead of a APMrover. I regularly need to exit MP and restart it to get the APMrover to appear. Anyone else have this problem?



Comment by Niall Dempsey on September 26, 2012 at 1:18am

Thomas - Thanks for your help

I had considered Sabertooth motor speed controllers but I ended up buying from 4QD in the UK and I've been using them for a couple of years with no problems.

In my current setup I'm using an Arduino and it reads the signals from the RC Receiver using CH1val = pulseIn(CH1, HIGH, 20000); and CH2val = pulseIn(CH2, HIGH, 20000); and I can then convert them to the format I need for the 4QD controllers. The problem is that when I try to use the same method with the APM 2.5 the values being read in are not correct. BTW the RC Receiver signals are not PWM there are PPL are far as I remember.

I'll have another go at trying to read the signals from the APM into the Arduino as it seems logical that they should be similar to what the RC Receiver produces.

Thanks again,


Comment by Thomas J Coyle III on September 25, 2012 at 3:59pm


I have a Dimension Engineering Sabertooth motor speed controller and in the RC mode the steering (aileron) signal determines direction (right/left) and the throttle signal determines the speed forward or backwards. This works with the APM 1 aileron and throttle signals for skid steering. I do not think that your speed controllers will work because you have no way to use the aileron signal for direction control in your setup. An Arduino Uno could be used to interpret the aileron signal to provide speed signals to the individual controllers to provide direction control. I have used an Arduino Uno to read PWM signals from an RC receiver so I know that it can be done. Try the Arduino Forum.



Comment by Niall Dempsey on September 25, 2012 at 12:52pm

Hello All,

I purchased the APM 2.5, uBlox GPS and 3DR Radio Kit and got it up and running with the Mission Planner. I now want to use this with an AGV that has tank steering. The 2 motor speed controllers I'm using have inputs for a PWM signal with a range 0 to 255 for motor speed and High/Low digital signal for Forward/Reverse.

It has been suggested that using Ailerons Mixing should provide what I need but the only parameter I could find was Elevon_Mixing and setting this to 1 does not seem to do what I want and even if it did the values would be in the wrong range.

I've had a look through the code but I'm finding it difficult to understand so as a temporary measure I tried using a second Arduino to read the outputs from Ch1 and Ch3 using PulseIn() but this doesn't read the values correctly. 

If anybody has got tank steering to work with APMrover2 or anybody can help, it would be greatly appreciated.



Comment by Vincent van Schijndel on September 23, 2012 at 11:18pm

Hello All,

i bought a second hand apm 1, to use with ardurover. looking forward to it, it should arrive in 1-2 weeks. 1 have 1 question. the owner told me i could never use the esc with bec, according to him i always have to take out the red wire from the esc and use a seperate ubec. this because if you plug in the usb without first powering the esc with a battery, there was a chance the esc pulled some power through the usb, causing the bord to blow.

is this correct? are you all using seperate ubecs? i cant find something about it on the forums, thats why i ask:)

thanks in advance!

greets vincent

Comment by Thomas J Coyle III on September 21, 2012 at 3:01pm

Hi All,

Well, I have got the ball rolling on building an ArduRover. How about some more build logs to give us ideas concerning building our own rovers! Help with hardware and software builds will be greatly appreciated by all.




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