Wednesday, June 12, 2013

Lego Mindstorms NXT Part 4: Connector

Lego Mindstorms NXT 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 Sensor Interface Pinout
Pin Name Function Color Pin Numbering
1 ANALOG Analog interface, +9V Supply Pin 1 - ANA
Rj25 connector.jpg
2 GND Ground Pin 2 - GND
3 GND Ground Pin 3 - GND
4 IPOWERA +4.3V Supply Pin 4 - IPOWERA
5 DIGIAI0 I2C Clock (SCL), RS-485 B Pin 5 - DIGIAI0
6 DIGIAI1 I2C Data (SDA), RS-485 A Pin 6 - DIGIAI1

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