I used the below code to detect whether or not a ball is red blue green etc. But everytime i run it on the nxt block it continues to show this "???". I need help, i dont see were the code could have gone wrong.

#pragma config(Sensor, S1, colorport, sensorCOLORFULL)
//*!!Code automatically generated by 'ROBOTC' configuration wizard !!*//

task main()
{
string sColor;

while (true) {
switch (SensorValue[colorport])
{
case 0: sColor = "Black"; break;
case 2: sColor = "Blue"; break;
case 4: sColor = "Green"; break;
case 6: sColor = "Yellow"; break;
case 8: sColor = "Red"; break;
case 17: sColor = "White"; break;
default: sColor = "???"; break;
}
nxtDisplayCenteredTextLine(2, sColor);
wait1Msec(50);
}
}

You're using the LEGO Color Sensor, not HiTechnic, right? If so, then your values are all wrong. Here:


Also, you never defined "colorport". The line at the top does that. Replace the "S1" in it with whichever port your sensor is plugged into. i.e. S2 for port two, S3 for port three, etc.

Thanks, i am currently in a differend class right now but i will try it out tomorrow. My teacher did get the sensor from the hitechnic website.
I got this code from a moderator on a website called bot bench. heres the link to it.
http://botbench.com/blog/2011/02/16/rob ... ur-sensor/

-Kelso

That code is for the LEGO Colour Sensor, not the HiTechnic Colour Sensor. You're going to want to check out HTCS2-test*.c examples that come with the driver suite. More info on the suite itself and how to get it working, etc, can be found on the same site you got this example from: http://botbench.com/blog/robotc-driver-suite/

- Xander

Ok thanks, ill check it out.
-Kelso

Ok, the driver tests work great, but now i need to add motor commands. So when it senses a green it does one thing and when it senses a red it does another. how would i go about doing that with the sample code? A fellow classmate used code similar to the above code posted and included his motor commands inbetween the color and break section for each color, but since that is not in the sample code i dont know how id go about doing that.

Looks like you have some learning to do! Go check out the curriculum on the robotc website and also check out the tutorial you can find here: http://botbench.com/blog/2009/05/14/robotc-tutorial/

- Xander

Ok, ill check that out, thanks for the help.

Hey Guys,
Sorry for interrupting the fun, but I have a burning question that has to be answered.
Can RobotC use the "Lamp" feature of the lego color sensor like NXT - G?

Thanks,
Neil

P.S.

I am new to the site
posting.php?mode=reply&f=1&t=4571#
posting.php?mode=reply&f=1&t=4571#

Check out the following blog at bot bench.com
At the very end of the comments Xander describes the code required to use lamp mode with the colour sensor.

http://botbench.com/blog/2011/02/16/robotc-using-the-nxt-2-0-colour-sensor/



BManCan

Thanks, Man