Additional sensors on the market

NXT Gyro Sensor (Model NGY1044) It costs: $ 48

Measure the additional dimension of rotation with the NXT Gyro Sensor. This sensor that lets you accurately detect rotation for your NXT projects. The NXT Gyro Sensor returns the number of degrees per second of rotation as well as indicating the direction of rotation. Measure +/- 360° per second and build robots that can balance, swing or perform other functions where measurement of rotation is essential.

NXT IRSeeker Sensor (Model NKS1042) It costs: $38

Great for RoboCup Jr competitions to detect the direction of the infrared RoboCup soccer ball. The IRSeeker has an array of infrared detecors that give a 135 degree view and returns the direction and relative signal strength indicating the location of the soccer ball. Your NXT robot can easily find the soccer ball and keep it in sight. A winning combination when combined with the HiTechnic NXT Compass Sensor!

NXT Compass Sensor (Model NMC1034) it costs: $46

Expand your NXT experiences with the new NXT Compass Sensor and add accurate navigation to your Mindstorms® NXT projects. The NXT Compass Sensor is a digital compass that measures the earth's magnetic field and outputs a value representing the current heading. The magnetic heading is calculated to the nearest 1° and returned as a number from 0 to 359. The NXT Magnetic Compass Sensor updates the heading 100 times per second. The Compass Sensor operates in two modes, Read mode and Calibrate mode. In Read mode, the current heading is calculated and returned each time to the NXT program executes a read command. In Calibrate mode the compass can be calibrated to compensate for externally generated magnetic field anomalies such as those that surround motors and batteries, thereby maintaining maximum accuracy.

NXT Color Sensor (Model NCO1038) It costs : $46

Add a spectrum of color to your models with the HiTechnic Color Sensor. Detect a range of target colors and program your NXT robot react to each color. Build a color sorter to sort LEGO bricks or a line follower that will detect different color lines and surface colors.

The HiTechnic Color Sensor is “tuned” to standard LEGO colors. When positioned over a surface, the Color Sensor will return a numeric value identifying the target color.

NXT Acceleration / Tilt Sensor ( Model NAC1040) It costs: $46

Now you can make robots that know which way is up! The HiTechnic Accelerometer / Tilt Sensor measures acceleration in three axes. It also measures tilt along each axis. Using the sensor, you can measure the acceleration of your robot build robots in the range –2g to + 2g. Great for experimenting with acceleration forces in cars, on amusement rides, even on swing sets. This sensor will also tell you if your robot is level so you can build self-leveling robots and much more.