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POTurning Motor on Lego NXT returns error 0002EA Type 2
 

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  1. POTurning Motor on Lego NXT returns error 0002EA Type 2
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    <p>I a writing a program using <strong>RobotC</strong> for the Lego NXT to imitate the behaviour of a puppy. This section of code is supposed to rotate the head which is connected to motor port 3 and read the value on the ultra sonic sensor. If while the head is turned, the dog is called, it will turn in the direction it was already facing. The following function is called when the ultrasonic sensor reads a value (meaning the robot has come close to a wall):</p> <p>visible</p> <pre><code>void SonarSensor() { int sensorValleft; int sensorValright; bool alreadyTurned = false; int i,j; i = 0; j = 0; motor[1] = 0; motor[2] = 0; motor[3] = -SPEED/2; wait10Msec(15); motor[3] = 0; sensorValleft = SensorValue[3]; while(i&lt;100) { if(SensorValue[4] &gt; 40)//calibrate sound sensor { //turn left motor[1]=SPEED; motor[2] = -SPEED; wait10Msec(25); i = 1000; j = 1000; alreadyTurned = true; } else { i++; wait1Msec(5); } } motor[3] = SPEED/2; wait10Msec(30); motor[3] = 0; sensorValright = SensorValue[3]; while(j&lt;100) { if(SensorValue[3] &gt; 1)//calibrate sound sensor { //turn right motor[1]-=SPEED; motor[2] = SPEED; wait10Msec(25); j = 1000; alreadyTurned = true; } else { j++; wait1Msec(5); } } if(alreadyTurned == false) { if(sensorValleft &gt; sensorValright) { //turn left motor[1]=SPEED; motor[2] = -SPEED; wait10Msec(25); } else { //turn right motor[1]=-SPEED; motor[2] = SPEED; wait10Msec(25); } } </code></pre> <p>}visible</p> <p>When the head (motor[3]) rotates the first time the error 0002EA Type2 appears on the NXT screen. At first we thought it was because we were over-rotating the motor causing it to be obstructed so we tried to play around with the wait times but it made no difference.</p> <p>Any ideas on what causes this error or how to fix it would be appreciated.</p> <p>Thanks, Dominique </p>
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    1. COI don't think your error is related to the motor movement, but rather to statement that sets `sensorValleft` where I think you should be `SensorValue[S3]` unless you're polling your sensors in another function that stores the various sensor values in an array.
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      1. POTurning Motor on Lego NXT returns error 0002EA Type 2
      1. USPAUL DUFRESNE
    2. COYou can access the SensorValue array using either its S1,S2,S3 or S4 value or its numerical value (0-3). This is not the issue
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