Hello guys,

I am new on Inmoov and MRL and try to do the tutorial on how to move a servo with MRL.

Quick presentation:

I am 33 years old, French and currently working in Shanghai. I used arduino some time ago when I had a reef tank in France, I used it to monitor my tank (Temperature, PH, light, pump...). Unfortunately I had to stop everything to go in China.

My issue:

In arduino runtime i have no board proposed but I can select the port used by my board (mega 1280).

I saw on other thread that it can be solved but uploading the script with the external arduino IDE.

I did it but I am not able to control a servo.

I select the pin and attach the board but nothing happen.


In arduino runtime it is written "Status: null / dev/ tty.usbserial-A4007nDr"

I send the NO Worky report and hope you can help me.





9 years 4 months ago

salut laurent 


bienvenue sur myrobotlab

moi aussi je suis francais lol sur marseille dans le sud de la france



9 years 4 months ago

Hello and Weclome Miserovitch !

Your English is impeccable.  Alessandruino has been trying to teach me Italian for years.. I haven't done very well :)

So lets jump into your no-worky and find the problem..

This is the interesting part of your no-worky:

[main] INFO  class org.myrobotlab.framework.Service  - ivy [runtime,x86.64.mac]
69   [main] INFO  class org.myrobotlab.framework.Service  - os.name [Mac OS X] getOS [mac]
69   [main] INFO  class org.myrobotlab.framework.Service  - os.arch [x86_64] getArch [x86]
69   [main] INFO  class org.myrobotlab.framework.Service  - getBitness [64]
70   [main] INFO  class org.myrobotlab.framework.Service  - java.vm.name [Java HotSpot(TM) 64-Bit Server VM] getVMName [hotspot]
74   [main] INFO  class org.myrobotlab.framework.Service  - version [1695.20130913.0508
18429 [arduinp] INFO  org.myrobotlab.serial.SerialDeviceFactory  - getSerialDevice /dev/tty.usbserial-A4007nDr|8|8|1|0
18429 [arduinp] INFO  org.myrobotlab.serial.SerialDeviceFactory  - Loaded class: class org.myrobotlab.serial.gnu.SerialDeviceFactoryGNU
The method to open the serial port is getSerialDevice - and I can see that its trying to open it with 8|8|1|0 - which is 8 bit rate 8 databits 1 stop bit and 0 parity.  WHAT ?!? 8 BIT RATE !!! - Ya .. so thats the problem. And below is a log segment from KMCGerald - our resident Mac expert. 
[main] INFO  class org.myrobotlab.framework.Service  - ivy [runtime,x86.64.mac]
215  [main] INFO  class org.myrobotlab.framework.Service  - os.name [Mac OS X] getOS [mac]
215  [main] INFO  class org.myrobotlab.framework.Service  - os.arch [x86_64] getArch [x86]
215  [main] INFO  class org.myrobotlab.framework.Service  - getBitness [64]
215  [main] INFO  class org.myrobotlab.framework.Service  - java.vm.name [Java HotSpot(TM) 64-Bit Server VM] getVMName [hotspot]
218  [main] INFO  class org.myrobotlab.framework.Service  - version [1823.20131021.0701
[Thread-8] INFO  org.myrobotlab.serial.SerialDeviceFactory  - getSerialDevice /dev/tty.usbmodem1421|57600|8|1|0
This looks more  "normal" - 57600 bit rate ;)
So the biggest difference I see between your two systems, is his is the latest version and yours is very very old.  Step 1 .. update to the latest and see if it works.  If it doesn't send me another noworky.


9 years 4 months ago

Hi and welcome..sometimes GUI (graphic interface) could be pretty "sissy"...

Use "strong" code-fu !!

In that post you LL find a code to copy paste in the python tab

Tweak the script modifying your comport and the servo pin...

Then hit execute !!

And it will auto-magically create services for arduino and servo !!

Let us know



9 years 4 months ago


Thanks for your help.

I tried last release before and forgot to speak about it. I am not able to install runtime. I have a huge list of unresolved dependencies. I send a new No Worky for that, sorry :-p


Using 1695 release i tried the "Python hard code" solution;

Status has changed to : connected to serial device /dev/tty.usbserial-A4007nDr which is good but servo is not responding.

In order to check that the hadware is right i uploaded a small script with external arduino IDE and it works so connections, board, servo are right.


Thanks to spend time to help me.