Bfeher: Created page with "NXT|NXT {| class="wikiText" |- |''For ROBOTC NXT Sensor ''functions'', check out the [[NXT_Functions_Sensors|NXT..."

2012-04-18T20:22:59Z

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|''For ROBOTC NXT Sensor ''functions'', check out the [[NXT_Functions_Sensors|NXT Sensor Functions]] page!''

''For information and examples on using I2C sensors, head over to [[NXT_I2C_Sensors|NXT I2C Digital Sensors]] page!''
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{{tl|1|}}

== Touch Sensor ==
{| style="font-family:Verdana, Geneva, sans-serif; color:black; background-color:#FFFFFF; text-align:left; font-size:100%;" width="100%" cellpadding="5%" cellspacing="0" border="0"
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|The NXT Touch Sensor has 2 states, pressed or unpressed. In code this is represented with a 1 for pressed, and a 0 for unpressed. There are no other states for this sensor. Below is a simple program that keeps your program from running until you press the Touch Sensor.
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|<syntaxhighlight lang="ROBOTC">
#pragma config(Sensor, S1, touchSensor, sensorTouch)
//*!!Code automatically generated by 'ROBOTC' configuration wizard !!*//

task main()
{
while(SensorValue(touchSensor) == 0) // while the Touch Sensor is inactive (hasn't been pressed):
{
// DO NOTHING (wait for press)
}
while(SensorValue(touchSensor) == 1) // while the Touch Sensor is active (pressed):
{
// DO NOTHING (wait for release)
}

// YOUR CODE GOES HERE
// otherwise (the touch sensor has been activated [pressed] ):
motor[motorB] = 75; /* run motors B and C forwards */
motor[motorC] = 75; /* with a power level of 75 */
wait1Msec(1000); // wait 1000 milliseconds (1 second) before moving to further code
}
</syntaxhighlight>
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|}
<br />

== Light Sensor ==
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|The NXT Light Sensor has a range of states between 0 and 100. The lower the number, the darker the reading is. The higher the number, the lighter the reading is. Below is a simple line-following program that uses only one NXT Light Sensor.
|-
|<syntaxhighlight lang="ROBOTC">
#pragma config(Sensor, S3, lightSensor, sensorLightActive)
//*!!Code automatically generated by 'ROBOTC' configuration wizard !!*//

task main()
{
wait1Msec(50); // The program waits 50 milliseconds to initialize the light sensor.
while(true) // Infinite loop
{
if(SensorValue(lightSensor) < 45) // If the Light Sensor reads a value less than 45:
{
motor[motorB] = 60; // Motor B is run at a 60 power level.
motor[motorC] = 20; // Motor C is run at a 20 power level.
}
else // If the Light Sensor reads a value greater than or equal to 45:
{
motor[motorB] = 20; // Motor B is run at a 20 power level.
motor[motorC] = 60; // Motor C is run at a 60 power level.
}
}
}
</syntaxhighlight>
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|}
<br />

== Sound Sensor ==
{| style="font-family:Verdana, Geneva, sans-serif; color:black; background-color:#FFFFFF; text-align:left; font-size:100%;" width="100%" cellpadding="5%" cellspacing="0" border="0"
|-
|The NXT Sound Sensor has a range of states between 0 and 100. The lower the number, the quieter the reading is. The higher the number, the louder the reading is. Below is a simple program that maps the Sound Sensor reading to the motor speeds.
|-
|<syntaxhighlight lang="ROBOTC">
#pragma config(Sensor, S2, soundSensor, sensorSoundDB)
//*!!Code automatically generated by 'ROBOTC' configuration wizard !!*//

task main()
{
wait1Msec(1000); // A one-second wait is required to cleanly initialize the Sound Sensor.
while(true) // Infinite loop
{
motor[motorB] = SensorValue[soundSensor]; /* Motors B and C are run at a power level equal */
motor[motorC] = SensorValue[soundSensor]; /* to the value read in by the Sound Sensor. */
}
}
</syntaxhighlight>
|-
|}
<br />

== Ultrasonic (sonar) Sensor ==
{| style="font-family:Verdana, Geneva, sans-serif; color:black; background-color:#FFFFFF; text-align:left; font-size:100%;" width="100%" cellpadding="5%" cellspacing="0" border="0"
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|The NXT Ultrasonic Sensor has a range of states between 0 and 255. This number is representative of the current reading in centimeters. However, a reading of 255 means that the current sensor reading is out of range. This is a "range error" and means that the echo is not being read back (looking down a long hall for example). A reading outside of these numbers indicates that there is no sensor attached or some error with the connection.
|-
|<syntaxhighlight lang="ROBOTC">
#pragma config(Sensor, S4, sonarSensor, sensorSONAR)
//*!!Code automatically generated by 'ROBOTC' configuration wizard !!*//

task main()
{
int distance_in_cm = 20; // Create variable 'distance_in_cm' and initialize it to 20(cm).
while(SensorValue[sonarSensor] > distance_in_cm) /* While the Sonar Sensor readings are greater */
} /* than the specified, 'distance_in_cm': */
motor[motorB] = 75; // Motor B is run at a 75 power level
motor[motorC] = 75; // Motor C is run at a 75 power level
}
motor[motorB] = 75; // Motor B is stopped at a 0 power level
motor[motorC] = 75; // Motor C is stopped at a 0 power level
}
</syntaxhighlight>
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|}
<br />

NXT Sensors Overview - Revision history

Bfeher: Created page with "NXT|NXT {| class="wikiText" |- |''For ROBOTC NXT Sensor ''functions'', check out the [[NXT_Functions_Sensors|NXT..."