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Pretty simple...What are all the different accessories that I can get for an NXT? I know this could turn into a list, but this will be a helpful list, I think.

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Power

9798 Rechargeable Battery

9798 Rechargeable Battery

Connectivity

LEGO 8528 Conversion Cable

Supports connecting sensors and motors from older LEGO® MINDSTORMS® RIS 2.0 (#3804) to new MINDSTORMS NXT Intelligent Brick.

LEGO 8529 Connector Cables

Enables connection of sensors and motors to your LEGO® MINDSTORMS® NXT.

LEGO 9847 Bluetooth Dongle

Allows remote control of the NXT instead of using cable.

Sensors

MS1048 RF ID Sensor

Manufactured under licence by Codatex. Reads 125 kHZ transponders of type EM4102. Various additional transponders are also available.

MS1048 RF ID Sensor

HiTechnic NAA1030 Angle Sensor

Manufactured under licence by HiTechnic. Measures axle rotation position and rotation speed.

HiTechnic NAA1030 Angle Sensor

HiTechnic NAC1040 Acceleration / Tilt Sensor

Manufactured under licence by HiTechnic. Measures both acceleration and tilt in three axes.

HiTechnic NAC1040 Acceleration / Tilt Sensor

HiTechnic NBR1036 Barometric Sensor

Manufactured under licence by HiTechnic. Able to read both atmospheric pressure and temperature. Can be used as part of a weather station or to measure altitude changes.

HiTechnic NBR1036 Barometric Sensor

HiTechnic NCO1038 Colour Sensor

Manufactured under licence by HiTechnic. Detects an extended range of more than 15 target colors.

MS1038 Colour Sensor V2

HiTechnic NEO1048 EOPD

Manufactured under licence by HiTechnic. The EOPD (Electro Optical Proximity Detector) uses an internal light source to detect the presence of a target or determine changes in distance to a target.

HiTechnic NEO1048 EOPD

HiTechnic NGY1044 Gyro Sensor

Manufactured under licence by HiTechnic. Accurately measures direction and amount of rotation.

HiTechnic NGY1044 Gyro Sensor

HiTechnic NIL1046 IRLink Sensor

Manufactured under licence by HiTechnic. Uses Infrared signals to communicate with trains, Power Functions Motor controller and the Mindstorms RCX.

HiTechnic NIL1046 IRLink Sensor

HiTechnic NIR1032 IRReceiver Sensor

Decodes commands from a Power Functions Remote Control.

HiTechnic NIR1032 IRReceiver Sensor

HiTechnic MS1034 Compass Sensor

Manufactured under licence by HiTechnic. Able to measure the earth's magnetic field to determine direction in which it is facing. Has a built-in calibration to help reduce magnetic interference from other sources.

HiTechnic MS1034 Compass Sensor

HiTechnic NMS1035 Magnetic Sensor

Manufactured under licence by HiTechnic. Detects magnetic fields that are present around the front of the sensor in a vertical orientation.

HiTechnic NMS1035 Magnetic Sensor

HiTechnic NSK1042 IRSeeker V2

Manufactured under licence by HiTechnic. Detects infrared signals from sources such as the HiTechnic IRBall soccer ball, infrared remote controls and sunlight.

HiTechnic NSK1042 IRSeeker

LEGO 9846 Ultrasonic Sensor

9846 Ultrasonic Sensor

LEGO 9845 Sound Sensor

Can measure sound pressure levels up to 90 dB.

9845 Sound Sensor

LEGO 9844 Light Sensor (Output: can also be used for as Lamp)

Can distinguish between light and dark

9844 Light Sensor

LEGO 9843 Touch Sensor

Detects when it is being pressed by something and when it is released again.

9843 Touch Sensor

LEGO 9749 Temparature Sensor

Can measure both temparature -20°C to +120°.

LEGO 9694 Color Sensor

Acts as a Colour Sensor distinguishing between six colours; as a Light Sensor detecting light intensities, both reflected light and ambient light; and as a Colour Lamp, emitting red, green or blue light.

LEGO 9799 Vernier NXT Sensor Adaptor

Allows you to integrate Vernier sensors with the Intelligent NXT brick and the NXT Software.

LEGO 9799 Vernier NXT Sensor Adaptor

Motors

9842 Interactiv Servo Motor

Can also be used as a rotation sensor.

9842 Interactiv Servo Motor

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This answer is CW: please feel free to extend it as appropriate. –  Kramii Dec 22 '11 at 9:55
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Added IR Receiver, IR Seeker, Gyroscopic Sensor and notes to clearify that the Servo Motor also is a sensor (rotation). –  oezi Dec 22 '11 at 10:36
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3rd party accessories should be separate. –  Ambo100 Dec 23 '11 at 16:37
    
The older RCX sensors and motors works just fine with NXT and the PF motors can also be used together with the NXT, either by cable (PF->RCX + RCX->NXT) or by using a IR sensor. Should we add those as well? –  Sebastian Wahl Dec 24 '11 at 12:49
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