Howto:Use Arduino with FlightGear: Difference between revisions

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Howto:Use Arduino with FlightGear (view source)

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'''[http://www.arduino.cc/ Arduino]''' is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software.  The hardware is a microcontroller designed around an 8-bit or 32-bit microcontroller, with several digital and analog {{Abbr|I/O|Input/Output}} ports.  The software is the [http://arduino.cc/en/Main/Software Arduino {{Abbr|IDE|Integrated Development Environment}}].
'''[http://www.arduino.cc/ Arduino]''' is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software.  The hardware is a microcontroller designed around an 8-bit or 32-bit microcontroller, with several digital and analog {{Abbr|I/O|Input/Output}} ports.  The software is the [http://arduino.cc/en/Main/Software Arduino {{Abbr|IDE|Integrated Development Environment}}].


== Example 1: Controlling internal properties ==
== Example 1: 2-axis joystic ==
<big>By ScottBouch</big>
 
This example demonstrates use of two potentiometers (2-axis joystic) with a simple calibration in arduino code. Example is done with Linux Mint. To see more detailed version of this quide go to [http://www.scottbouch.com/flightgear-sim-arduino-serial-hardware-2-axis-potentiometer-joystick.html 2-Axis Potentiometer Joystick:Integration With Flightgear Flight Sim].
 
=== Wiring ===
Connect 5V to other terminal of potentiometers and 0V to other terminal. Connect potentiometers wiper terminals to Arduino boards A0 and A1.
 
=== Arduino code ===
<syntaxhighlight lang="c">
/*
Flightgear hardware integration 01: Stick X and Y only so far.
 
Scott Bouchard UK www.scottbouch.com 14-06-2017
*/
 
const int stickxio = A0; //Define stick aileron (x) input
const int stickyio = A1; //Define stick elevator (y) input
 
float stickx = 0;        //Start aileron (x) central
float sticky = 0;        //Start elevator (y) central
 
void setup() {
  Serial.begin(9600);    //Open up serial communication to PC
}
 
void loop() {
  stickx  = (analogRead(stickxio)/512.0)-0.99; //Calibration span and offset
  sticky = (analogRead(stickyio)/512.0)-0.99; //Calibration span and offset
 
  Serial.print(stickx);  //Send aileron position
  Serial.print(",");    //Variable (var) separator
  Serial.print(sticky);  //Send elevator position
  Serial.print("\n");    //Line separator
}
</syntaxhighlight>
 
=== Calibration ===
Use Arduino serial monitor to see that serial data acquired from Arduino board is between -1.00...1.00 when potentiometers are rotated. Potentiometers middle position should send 0.00. If potentiometers are not giving good readings, modify Arduino code "Calibration span and offset" row to fix it.
 
=== Flightgear protocol code ===
Create a file called hardware.xml to /usr/share/games/flightgear/Protocol directory and paste following lines to it:
 
<syntaxhighlight lang="xml">
<?xml version="1.0"?>
 
<PropertyList>
 
<generic>
 
<input>
<line_separator>\n</line_separator>
<var_separator>,</var_separator>
 
<chunk>
<name>aileron</name>
<type>float</type>
<node>/controls/flight/aileron</node>
</chunk>
 
<chunk>
<name>elevator</name>
<type>float</type>
<node>/controls/flight/elevator</node>
</chunk>
 
</input>
 
</generic>
 
</PropertyList>
</syntaxhighlight>
 
=== Make Flightgear to read serial data ===
Find port where Arduino is connected. Look from Arduino IDE Tools... Serial Port... Should be something like ttyACM. (Note: Scott Bouch tutorial uses FGRUN which is not used anymore) Start Flightgear and paste following code to Settings... Additional settings... when starting Flightgear. Change serial port to correct port name.
 
<syntaxhighlight>
--generic=serial,in,30,/dev/ttyACM0,9600,hardware.xml
</syntaxhighlight>
 
== Example 2: Controlling internal properties ==
<big>By {{usr|Vaipe}}</big>
<big>By {{usr|Vaipe}}</big>


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You have to do this every time after you use the Arduino IDE.}}
You have to do this every time after you use the Arduino IDE.}}
{{Note|The above note may not be relevant to newer versions of the Arduino IDE software.}}


==== Starting FlightGear ====
==== Starting FlightGear ====
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dmesg | tail
dmesg | tail
</syntaxhighlight>
</syntaxhighlight>
It should give you a message something like <code>ttyACM0: USB ACM device</code> or <code>ttyACM1: USB ACM device</code>. That is your port. Finally, save setting by clicking "OK" and click "Run" to start FlightGear. For a more detailed guide, see [https://sites.google.com/site/flightgeararduinoandlinux/home Flightgear, Arduino and Linux]
It should give you a message something like <code>ttyACM0: USB ACM device</code> or <code>ttyACM1: USB ACM device</code>.  
 
{{Note|This command gives you the last event in the stack,
 
so you need to make sure you plug in or unplug your Arduino to the serial port
 
immediately prior to running the command.}}
 
That is your port. Finally, save setting by clicking "OK" and click "Run" to start FlightGear. For a more detailed guide, see [https://sites.google.com/site/flightgeararduinoandlinux/home Flightgear, Arduino and Linux]
 
{{Note|In some installations you need set permission for $user
 
to the groups tty and dialout or the Arduino will fail to
 
establish a connection to FlightGear.}}


== Example 2: Outputting properties ==
== Example 3: Outputting properties ==
<big>By {{usr|Rubdos}}</big>
<big>By {{usr|Rubdos}}</big>
[[File:Arduinofgfs.jpg|thumb|270px|Arduino LCD panel displaying speed, heading and altitude.]]
[[File:Arduinofgfs.jpg|thumb|270px|Arduino LCD panel displaying speed, heading and altitude.]]
Wlbragg
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