Tutorial.RobotCompass History

May 18, 2013, at 08:00 AM by Scott Fitzgerald -
Changed lines 32-103 from:
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May 17, 2013, at 06:23 PM by David Cuartielles -
Changed lines 108-109 from:
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May 17, 2013, at 09:29 AM by Scott Fitzgerald -
Changed lines 5-8 from:

The robot has an on-board compass module, with which it can tell the precise direction. This sketch will make sure the robot goes towards a certain direction, so long there're no magnets around.

Hold the robot with your hands and turn it. You will see on the screen what the robot measures.

to:

The robot has a compass module, which it uses to find its direction. This sketch will make sure the robot goes towards a certain direction.

When you hold the robot in your hands and rotate, you will the screen change, indicating direction.

NB : magnets will interfere with the compass. If you're getting unexpected results, check to make sure there are none around.

Changed lines 18-22 from:
1. Place the robot on the ground
2. After the starting screen, a graph will show up on the screen, representing a compass
3. The robot will start exploring towards a persistent direction. If you push it out of its direction, it'll turn around in a curve
4. If you want to change the robot's heading direction, look for the line int direc=180; at the beginning of the code. Change the value to another number, between 0 and 359. Try again and see where the robot is heading this time!
to:
1. Place the robot on the ground.
2. After the starting screen, a graph will appear on-screen, representing the compass
3. The robot will start moving in a direction (in this example, it will sart heading south). If you move it in a different direction, it will turn back to the way it wants to move.
4. If you want to change the robot's heading, in the code, look for `int direc=180` at the beginning of the code. Change this value to another number, between 0 and 359. 0 represents north, 90 is east, 180 is south, and 270 is west. Where do you want to go?
May 15, 2013, at 01:01 PM by Scott Fitzgerald -
Changed lines 31-100 from:

place the actual code in here

to:

/* Robot Compass

``` The robot has an on-board compass module, with
which it can tell the direction the robot is
facing. This sketch will make sure the robot
goes towards a certain direction.
```

``` Beware, magnets will interfere with the compass
readings.
```

``` Circuit:
* Arduino Robot
```

``` created 1 May 2013
by X. Yang
modified 12 May 2013
by D. Cuartielles
```

``` This example is in the public domain
*/
```

// include the robot library

1. include <ArduinoRobot.h>

int speedLeft; int speedRight; int compassValue; int direc = 180; //Direction the robot is heading

void setup() {

```  // initialize the modules
Robot.begin();
Robot.beginTFT();
Robot.beginSD();
Robot.displayLogos();
```

}

void loop() {

```  // read the compass orientation
compassValue = Robot.compassRead();
```

```  // how many degrees are we off
int diff = compassValue-direc;
```

```  // modify degress
if(diff > 180)
diff = -360+diff;
else if(diff < -180)
diff = 360+diff;
```

```  // Make the robot turn to its proper orientation
diff = map(diff, -180, 180, -255, 255);
```

```  if(diff > 0) {
// keep the right wheel spinning,
// change the speed of the left wheel
speedLeft = 255-diff;
speedRight = 255;
} else {
// keep the right left spinning,
// change the speed of the left wheel
speedLeft = 255;
speedRight = 255+diff;
}
// write out to the motors
Robot.motorsWrite(speedLeft, speedRight);
```

```  // draw the orientation on the screen
Robot.drawCompass(compassValue);
```

}

May 10, 2013, at 02:43 PM by Xun Yang -
Added lines 14-20:

Instruction

1. Upload the example, unplug USB and turn on power.
2. Place the robot on the ground
3. After the starting screen, a graph will show up on the screen, representing a compass
4. The robot will start exploring towards a persistent direction. If you push it out of its direction, it'll turn around in a curve
5. If you want to change the robot's heading direction, look for the line int direc=180; at the beginning of the code. Change the value to another number, between 0 and 359. Try again and see where the robot is heading this time!
Deleted lines 34-40:

Instruction

1. Upload the example, unplug USB and turn on power.
2. Place the robot on the ground
3. After the starting screen, a graph will show up on the screen, representing a compass
4. The robot will start exploring towards a persistent direction. If you push it out of its direction, it'll turn around in a curve
5. If you want to change the robot's heading direction, look for the line int direc=180; at the beginning of the code. Change the value to another number, between 0 and 359. Try again and see where the robot is heading this time!
May 10, 2013, at 02:42 PM by Xun Yang -
Changed lines 28-34 from:
to:

Instruction

1. Upload the example, unplug USB and turn on power.
2. Place the robot on the ground
3. After the starting screen, a graph will show up on the screen, representing a compass
4. The robot will start exploring towards a persistent direction. If you push it out of its direction, it'll turn around in a curve
5. If you want to change the robot's heading direction, look for the line int direc=180; at the beginning of the code. Change the value to another number, between 0 and 359. Try again and see where the robot is heading this time!
Changed line 42 from:
to:
May 03, 2013, at 11:35 AM by Xun Yang -
Changed lines 1-2 from:

Examples > Lottie Lemon?

to:

Examples > Robot?

May 03, 2013, at 06:40 AM by David Cuartielles -
Added lines 1-36: