normally, these pins are either used for rs485, i2c or controlling the light on a lego light sensor. Some example solutions to typical robotics problems, written in RobotC for Lego Mindstorms NXT. this sensor type was introduced to allow the fast toggling of the dig0 and dig1 lines on the nxt’s sensor ports. However, such an output means, that you can adjust the thresholds you want to be recognized as blue very nicely in software: for example by saying if the blue value is the highest of those 3, you have a blue line and act accordingly. With robotc 3.59 came two new sensor types, the sensorcustom and the complimentary sensorcustom9v. The error I suspect is that SensorValue actually is a value from 0 to 255 and the chance that you get exactly the number sensorCOLORBLUE is very small. pragma config(Sensor, S3, light, sensorLightActive). The original RCX light sensor is not a great device to measure external. The larger the number, the brighter the incoming light. RobotC has 100s of already built functions to make programming your robot easier. Both NXT-G and RobotC allow you to set the sensor to generate light (or not). So I'll go into ROBOTC and write a quick program to light an LED for five. According to this page the sensor basically gives you three integers corresponding to the intensity of red/green/blue light. (called a switch by PCS), and the last is an analog light sensor, which.
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