centimeters and inches. The maximum distance it can measure is 233 cm with a precision of 3 centimeters. The ultrasonic sensor works by sending out ultrasonic sound waves that bounce off an object ahead of it and then back. It senses the time it took for that to happen. In the Lego Mindstorms 2.0 base kit, it includes: 2 Touch sensors, one Color sensor (detects several different colors), and an Ultrasonic sensor. These parts are not included in the Lego Mindstorms NXT base kit and may be bought separately: Third-party companies also manufacture sensors such as the compass, gyroscope, infrared tracker, RFID reader and accelerometer sensors sold by Lego. The temperature sensor can measure temperature in Celsius or Fahrenheit. The sensors come assembled and programmed. In the software (see Programming above), people can decide what to do with the information that comes from the sensors, such as programming the robot move forward until it touches something. Lego also sells an adapter to the Vernier sensor product line. Vernier produces data collection devices and related software for use in education. Connector Sensors are connected to the NXT brick using a 6-position modular connector that features both analog and digital interfaces. The analog interface is backward-compatible (using an adapter) with the older Robotics Invention System. The digital interface is capable of both I2C and RS-485 communication. NXT 2.0 Lego Mindstorms NXT 2.0 is the second set from LEGO's Lego Mindstorms series, launched on August 5, 2009, at the Lego Shop in the U.S. The set contains 619 pieces, including a new sensor that can detect colors. It is priced at approximately US$280, C$350, £230 or A$500. Lego Mindstorms NXT 2.0 has a successor, called the Lego Mindstorms EV3. 8547 Kit Features Includes a sound editor for recording any sound and then programming the NXT Brick to play it. Includes an image editor for downloading an image to the NXT Brick to appear on the screen. Includes 619 pieces (including the NXT Brick) NXT Intelligent Brick 32-bit Atmel AT91SAM7S256 main microcontroller (256 KB flash memory, 64 KB RAM) 8-bit Atmel ATmega48 microcontroller @ 4 MHz (4 KB flash memory, 512 Bytes RAM) 100×64 pixel LCD screen Four RJ12 input ports (ports 1–4) Three RJ12 output ports (ports A-C) USB port Bluetooth Class II V2.0 Loudspeaker – 8 kHz sound quality, 8-bit resolution, 2–16 kHz sample rate Four push buttons, used to navigate menus