line tracker

VEX V5 Technical Support UNOFFICIAL Tech Support
1

i am using a line tracking program example from RobotC but it runs constantly and doesnt have a time limit. how do i program it to stop ? i want it to do another task on the same program

2

change the while loop from while(true) to while(whatever condition you want). You could check the timer and use its value as less than some amount of time as your condition.

3

This is the program, what should i change? Thanks!

task main()
{
wait1Msec(2000);
int threshold = 1000; /* found by taking a reading on both DARK and LIGHT /
(SensorValue(sonarSensor) > 20 || SensorValue(sonarSensor) == -1); / surfaces, adding them together, then dividing by 2. */
while(true)
{
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -+
displayLCDCenteredString(0, “Light Sensor:”); // Display |
displayLCDPos(1,6); // Sensor |
displayNextLCDNumber(SensorValue(lineTracker)); // Readings |
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -+

	// sensor sees light:
	if(SensorValue(lineTracker) < threshold)
	{
		// counter-steer left:
		motor[leftMotor]  = 63;
		motor[rightMotor] = 0;
  
	}
	// sensor sees dark:
	else
	{
		// counter-steer right:
		motor[leftMotor]  = 0;
		motor[rightMotor] = 63;
4

Your condition needs to be inside while(), in place of true, not before while().

5