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The RCX

The RCX. Hitachi H8/3297 series processor 3 inputs/sensors (1, 2, 3) 3 outputs/motors (A, B, C) 32k RAM/ 16k ROM 12 kB free in leJOS Multiple threads of execution LCD Display & Speaker 3 programmable buttons IR send/receive Sensors Light, touch, rotation Sonar and compass avail.

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The RCX

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  1. The RCX • Hitachi H8/3297 series processor • 3 inputs/sensors (1, 2, 3) • 3 outputs/motors (A, B, C) • 32k RAM/ 16k ROM • 12 kB free in leJOS • Multiple threads of execution • LCD Display & Speaker • 3 programmable buttons • IR send/receive • Sensors • Light, touch, rotation • Sonar and compass avail

  2. LEGO Mindstorms NXT • Atmel 32-bit ARM processor • 4 inputs/sensors (1, 2, 3, 4) • 3 outputs/motors (A, B, C) • 256 KB Flash Memory • 64 KB RAM • USB 2.0 Communication • 4 programmable buttons • 100x64 b/w LCD Display • Sensors • Active: • Old light and rotation • Passive • Touch, sensors for NXT • Digital • Ultrasonic • Motors • 170 RPM • 360 RPM for old motors, why?

  3. ROBOLAB • Pilot Mode • graphics based • limited capability • great for kids? • Inventor Mode • variables • conditionals • loops • multitasking • Investigator Mode • Charts & graphs • Analyze data

  4. Inventor

  5. Working with RCX • RCX needs firmware on it in order to be programmable • Programming process • Design program • Implement on PC • Download onto RCX using IR tower • Code converted to bytecodes that RCX understands • Test • Debug and go back to step 1 or 2

  6. Pilot

  7. Challenges • Make a car • Build a vehicle that will reliable go backwards and forwards • Getting there • Using Pilot 1 - program your car to move for 1 sec • Measure the distance it went • Predict distance for n sec (Pilot 2 may be useful) • Run and check model • Touch-activated • Using Pilot 4 make it so your robot starts when the touch sensor is pressed and stops when it hits something • Can you keep your robot from running off the table with a light sensor?

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