I use three color. Yellow, Green, Blue.
Yellow and Green are objective item in the field
Blue is a endPoint how to locate the data files from NXT memory and send to cellphone via bluetooth

#pragma config(Sensor, S1, colorPort, sensorCOLORFULL)
#pragma config(Sensor, S2, compassSensor, sensorVirtualCompass)
#pragma config(Sensor, S3, lightSensor, sensorLightActive)
#pragma config(Sensor, S4, sonarSensor, sensorSONAR)
#pragma config(Motor, motorA, gripperMotor, tmotorNormal, PIDControl, encoder)
#pragma config(Motor, motorB, rightMotor, tmotorNormal, PIDControl, encoder)
#pragma config(Motor, motorC, leftMotor, tmotorNormal, PIDControl, encoder)



void displayRGBColorValues();
void displaySingleColorValue();
void displayPegCounts();
task buttonTask();
bool bDisplayPegCounts = false;
int msgSize;
byte msg[58];

task main()
{
nxtDisplayCenteredBigTextLine(0, "Color");
nxtDisplayCenteredBigTextLine(2, "Sensor");
nxtDisplayCenteredBigTextLine(4, "Test");

StartTask(buttonTask);

wait1Msec(200);

nVolume = 2;
while (true)
{
bool bFlashingState = true;

while (true)
{
if (validColorSensor(colorPort))
break;
if (bFlashingState)
{
nxtDisplayCenteredTextLine(6, "Connect Sensor");
nxtDisplayCenteredTextLine(7, "to Port S1");
PlaySound(soundBeepBeep);
}
else
{
nxtDisplayCenteredTextLine(6, "");
nxtDisplayCenteredTextLine(7, "");
}
bFlashingState = !bFlashingState;
wait1Msec(300);
}
PlaySound(soundFastUpwardTones);
eraseDisplay();
while (true)
{
if (!validColorSensor(colorPort))
break;

if (bDisplayPegCounts)
{
displayPegCounts();
}
else
{
nxtDisplayTextLine(2, "");
switch (SensorType[colorPort])
{
case sensorCOLORNONE: nxtDisplayCenteredBigTextLine(0, "Ambient"); displaySingleColorValue(); break;
case sensorCOLORRED: nxtDisplayCenteredBigTextLine(0, "Red"); displaySingleColorValue(); break;
case sensorCOLORGREEN: nxtDisplayCenteredBigTextLine(0, "Green"); displaySingleColorValue(); break;
case sensorCOLORBLUE: nxtDisplayCenteredBigTextLine(0, "Blue"); displaySingleColorValue(); break;
case sensorCOLORFULL: nxtDisplayCenteredBigTextLine(0, "RGB"); displayRGBColorValues(); break;
default: nxtDisplayCenteredBigTextLine(0, "Bad Type"); break;
}
}
wait1Msec(150);
}
}
}

task buttonTask()
{
while (true)
{
wait1Msec(100);
if (!validColorSensor(colorPort))
continue;

switch (nNxtButtonPressed)
{
case kExitButton:
StopAllTasks();
break;


case kEnterButton:
hogCPU();
eraseDisplay();
bDisplayPegCounts = !bDisplayPegCounts;
releaseCPU();
while (nNxtButtonPressed != kNoButton)
{}
break;

case kRightButton:
switch (SensorType[colorPort])
{
case sensorCOLORNONE: SensorType[colorPort] = sensorCOLORRED; break;
case sensorCOLORRED: SensorType[colorPort] = sensorCOLORGREEN; break;
case sensorCOLORGREEN: SensorType[colorPort] = sensorCOLORBLUE; break;
case sensorCOLORBLUE: SensorType[colorPort] = sensorCOLORFULL; break;
default:
case sensorCOLORFULL: SensorType[colorPort] = sensorCOLORNONE; break;
}
while (nNxtButtonPressed != kNoButton)
{}
break;

case kLeftButton:
switch (SensorType[colorPort])
{
case sensorCOLORNONE: SensorType[colorPort] = sensorCOLORFULL; break;
case sensorCOLORRED: SensorType[colorPort] = sensorCOLORNONE; break;
case sensorCOLORGREEN: SensorType[colorPort] = sensorCOLORRED; break;
case sensorCOLORBLUE: SensorType[colorPort] = sensorCOLORGREEN; break;
default:
case sensorCOLORFULL: SensorType[colorPort] = sensorCOLORBLUE; break;
}
while (nNxtButtonPressed != kNoButton)
{}
break;
}
}
}

void displayColorIndex()
{
string sColor;

switch (SensorValue[colorPort])
{
case BLACKCOLOR: sColor = "Black"; break;
case BLUECOLOR: sColor = "Blue"; break;
case GREENCOLOR: sColor = "Green"; break;
case YELLOWCOLOR: sColor = "Yellow"; break;
case REDCOLOR: sColor = "Red"; break;
case WHITECOLOR: sColor = "White"; break;
default: sColor = "???"; break;
}
nxtDisplayCenteredTextLine(2, sColor);
}

void displayRGBColorValues()
{
short nAtoDValues[4];
short nRawValues[4];
short nColorValues[4];
string sTemp;

getColorSensorData(colorPort, colorAtoD, &nAtoDValues);
getColorSensorData(colorPort, colorRaw, &nRawValues);
getColorSensorData(colorPort, colorValue, &nColorValues);

displayColorIndex();

nxtDisplayTextLine(3, " AtoD Raw %%");
StringFormat(sTemp, "R %4i%5i", nAtoDValues[0], nRawValues[0]); nxtDisplayTextLine(4, "%s%4i", sTemp, nColorValues[0]);
StringFormat(sTemp, "G %4i%5i", nAtoDValues[1], nRawValues[1]); nxtDisplayTextLine(5, "%s%4i", sTemp, nColorValues[1]);
StringFormat(sTemp, "B %4i%5i", nAtoDValues[2], nRawValues[2]); nxtDisplayTextLine(6, "%s%4i", sTemp, nColorValues[2]);
StringFormat(sTemp, "Amb%4i%5i", nAtoDValues[3], nRawValues[3]); nxtDisplayTextLine(7, "%s%4i", sTemp, nColorValues[3]);
}

void displaySingleColorValue()
{
word nAtoDValue;
word nRawValue;
word nColorValue;
string sTemp;

nAtoDValue = 0;
nRawValue = SensorRaw[colorPort];
nColorValue = SensorValue[colorPort];

nxtDisplayTextLine(3, " AtoD Raw %%");
switch (SensorType[colorPort])
{
case sensorCOLORRED: StringFormat(sTemp, "R %4i%5i", nAtoDValue, nRawValue); nxtDisplayTextLine(4, "%s%4i", sTemp, nColorValue); break;
case sensorCOLORGREEN: StringFormat(sTemp, "G %4i%5i", nAtoDValue, nRawValue); nxtDisplayTextLine(5, "%s%4i", sTemp, nColorValue); break;
case sensorCOLORBLUE: StringFormat(sTemp, "B %4i%5i", nAtoDValue, nRawValue); nxtDisplayTextLine(6, "%s%4i", sTemp, nColorValue); break;
case sensorCOLORNONE: StringFormat(sTemp, "Amb%4i%5i", nAtoDValue, nRawValue); nxtDisplayTextLine(7, "%s%4i", sTemp, nColorValue); break;
}
}

void displayPegCounts()
{

TColorPegCounts nPegCounts;

getColorSensorPegCounts(colorPort, &nPegCounts);

nxtDisplayCenteredBigTextLine(0, "PegCounts");

nxtDisplayTextLine(2, "%5d Reads", nPegCounts.nReadCount);
nxtDisplayTextLine(3, "");
nxtDisplayTextLine(4, "%5d Disconnect", nPegCounts.nDisconnects);
nxtDisplayTextLine(5, "%5d Soft Reset", nPegCounts.nSoftwareResets);
nxtDisplayTextLine(6, "%5d CRC Errs:", nPegCounts.nCRCMismatch);
nxtDisplayTextLine(7, "%5d Wait 4 H/W", nPegCounts.nWaitForConnect);
nxtDisplayTextLine(1, "%3d, %3d",cCmdBTCheckStatus(0));
// check for a BT connection
switch (cCmdBTCheckStatus(0))
{
case(ioRsltSuccess):
// connected;
nxtDisplayTextLine(2," Connected");
// check for msg in mailbox1;
msgSize=cCmdMessageGetSize(mailbox1);
if (msgSize>0)
{
cCmdMessageRead(msg, msgSize, mailbox1);
nxtDisplayTextLine(3, msg);
}
break;
case(ioRsltCommChannelNotReady):
// not connected;
nxtDisplayTextLine(2,"Disconnected");
break;
default:
// Other condition;
nxtDisplayTextLine(2, "%3d, %3d",cCmdBTCheckStatus(0));
break;
}
wait1Msec(10);
}


tnx for helping me!! where i put the endTask using color blue