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BEST Robotics Hardware Overview

BEST Robotics Hardware Overview. Courtney Pinnell and Brina Saldivar AWEE (Association of Women in Electrical Engineering). VEX Cortex Microcontroller. Coordinates the flow of information and power on the robot All other electronic system components must interface to the Microcontroller

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BEST Robotics Hardware Overview

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  1. BEST Robotics Hardware Overview Courtney Pinnell and BrinaSaldivar AWEE (Association of Women in Electrical Engineering)

  2. VEX Cortex Microcontroller • Coordinates the flow of information and power on the robot • All other electronic system components must interface to the Microcontroller • STMicroelectronics ARM Cortex-M3 user processor

  3. Microcontroller Features • Wireless with built-in VEXnet technology • (8) Standard 3-wire Motor ports • (2) 2-wire Motor ports • (1) I2C "smart sensor" port • (2) UART Serial Ports • (8) Hi-res (12-bit) Analog Inputs • (12) Fast digital I/O ports which can be used as interrupts • Programmable with easyC v4 for Cortex or ROBOTC for Cortex & PIC

  4. Futaba S3003 Servo • Electric Motor where you can control position • Specs: • Speed: • 0.23 sec/60° @ 4.8V • 0.19 sec/60° @ 6V • Torque: • 44 oz-in (3.2 kg-cm) @ 4.8V • 57 oz-in (4.1 kg-cm) @ 6V

  5. BEST Large Motor • Operates at 7.2V • Free Speed: 43 RPM • Stall Torque: 23.53 in*lbs • Stall Current: 3.34 amps • Free Current: 0.32 amps

  6. BEST Small Motor • Operates at 7.2V • Free Speed: 90 RPM • Stall Torque: 9.49 in*lbs • Stall Current: 2.39 amps • Free Current: 0.21 amps

  7. Motor Controller • This Motor Controller takes the PWM control signal from the VEX Controller and coverts that to a varying DC voltage which the VEXplorer Motor requires • The Motor Controller is thermal limited to about 1A • Red Wire: • Battery input. 9V max • Black Wire: • Ground • White Wire: • PWM Input: 1ms - 2ms will give full reverse to full forward, 1.5ms is neutral

  8. Wireless USB Adapter • Works with the VEX Cortex Microcontroller to communicate wirelessly with your robot • 802.11b/g wireless USB device

  9. VEXnet Joystick • The VEXnet Joystick allows a human operator to control a robot in real-time using the innovative VEXnet 802.11 Wireless link

  10. VEXnet Joystick • The joystick has two 2-axis analog joysticks, 4 trigger buttons and two 4-button directional pads • It also has a 3-Axis Accelerometer that provides X-Y tilt outputs, X-Y-Z acceleration and a shake output • This allows you to control an arm or drive system by changing the orientation of the joystick (tilting, turning or shaking)

  11. easyC for Cortex • Drag-and-drop programming to the VEX Cortex Microcontroller • Full C text editor for advanced, customized programming • Enhanced Online window to manually test motors and sensors • Download to the robot wirelessly • 14 Tutorials and over 50 sample files included

  12. References • http://www.vexrobotics.com/products/accessories/logic/276-2194.html

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