I have a lego colour sensor and I need to use it as both a light and colour sensor in a program. Is this possible?Is it also possible to switch between the modes of the sensor during the program?
I have tried but I cannot define sensors other than the beginning of the program.

Sure, that's very possible.

SensorValue will adjust accordingly. In FULL mode, it will return the colour number, otherwise it will return a number between 0-100. You can do this in the middle of your code without any problems at all.

- Xander

Thanks.
I never knew there was that.

That would save a lot of time.

So much to discover

- Xander

Another question. I really need to make the sensor switch modes extremely fast. I have tried and can only make than switch succesfully in approx. 160 milliseconds. What is the fastest the LEGO colour sensor can do?

That is pretty much the fastest it'll go. It is very slow to switch modes, I am not sure why that is.

- Xander

In full color mode, the FW reads the light level with no light (LED off), red light, green light, and blue light. The value provided as the "sensor value" is a color number based on the 4 values that it read. In NXC you can access these 4 values that the FW is reading, so unless for cosmetic reasons, there is usually no real functional reason to use any mode but full color mode. I don't know if ROBOTC supports something that, but it should, since the FW already knows the values, and it's just a matter of giving access to the user program. That way you can avoid the extremely long mode switching times, and have access to any value the sensor/FW can provide.

You can in ROBOTC, too. I'll see if I have some code to do that.

- Xander