Tank Drive Pattern

Challenge

A simple and intuitive joystick mapping for maneuvering about the field.

*Don’t forget to include Joystick Drivers.

* Also remember to call the joystick settings with:

getJoystickSettings(joystick);


Solution
Using the D-Pad to directly affect the speed and maneuverability of the robot.
Pattern Template
Left drive motor <-- Left Analog Stick Y Axis
Right driver motor <-- Right Analog Stick X Axis
Using these variables, if you wanted a very simple program that looks  at the Y-Value of the left analog stick, and the Y-Value of the right  analog stick, and assigns it to the left and right motors respectively  (like a tank drive):
Example(s)
This code disregards achieves the same as the code above, but disregards small values.

task main() {
  while(true) {
    getJoystickSettings(joystick);
    motor[motorD] = joystick.joy1_y1;
    motor[motorE] = joystick.joy1_y2;

    wait1Msec(10);
  }
}
 
This code combines everything above, and should deliver the full shebang.
 
task main() {
  waitForStart();
  int leftPower, rightPower;

  while(true) {
    getJoystickSettings(joystick); // Update Joystick variables

    // Save the joystick values to two local variables
    leftPower = joystick.joy1_y1;
    rightPower = joystick.joy1_y2;

    // Check to make sure the values aren't too negligible
    if (abs(leftPower) < 10) {
      leftPower = 0;
    }

    if (abs(rightPower) < 10) {
      rightPower = 0;
    }

    // Check some buttons to move an NXT motor
    if(joy1Btn(2)) {
      motor[motorA] = 50;
    }else if(joy1Btn(4)) {
      motor[motorA] = -50;
    }else {
      motor[motorA] = 0;
    }

    motor[motorD] = leftPower;  //Assign modified joystick variables to motor power.
    motor[motorE] = rightPower;

    wait1Msec(10);
  }
}

 Related Patterns
Deadzone Pattern
Submitted by: Mark Raymond Jr.
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