Modern Robotics LEGO Mindstorms IRSeeker V3 Infrared Sensor

• Detects IR signals from the HiTechnic IR Beacon or IR ball
• IR: Wavelength range: 850–940nm / Modulation: 600 and 1200Hz
• Internal sampling rate: 30 samples per second
• Typical maximum range: 2.4 m
• Compatible with Hitechnic Infrared Electronic Ball
  

The Modern Robotics LEGO Mindstorms IRSeeker V3 Infrared Sensor detects IR signals from the HiTechnic IR Beacon or IR ball and by using two detectors it calculates the direction to the signal source.

The relative signal strength from a left and right looking detector are combined to create approximate direction readings. These readings are simultaneously taken for both the 600Hz and 1200Hz beacon and ball frequencies. Direction readings to the left of center are negative, to the right of center are positive and dead ahead are zero.