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R 3. Ethan Hall Michael Kelton Greg Wegman Vashisht Lakhmani. Description. Mars Science Lab Rover Replica Circuit Design Points of Interest Driving the motors Steering the motors Charging the batteries Sensors Wireless communication. Block Diagram. Theory of Operation.

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R 3

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  1. R3 Ethan Hall Michael Kelton Greg Wegman Vashisht Lakhmani

  2. Description • Mars Science Lab Rover Replica • Circuit Design Points of Interest • Driving the motors • Steering the motors • Charging the batteries • Sensors • Wireless communication

  3. Block Diagram

  4. Theory of Operation • Microcontroller • Power Supply • Motor Control Circuit • Sensor Circuit • Wireless Communication Breakout

  5. Microcontroller • LPC1768 • 32 bit ARM Cortex M3 • 512 kB Flash; 32kB SRAM • I2C; UART; USB; PWM • Run at 3.3V

  6. Microcontroller

  7. Power Supply • 2 Batteries in Series • Motors run at 5V • 3.7V LiPoly batteries in series = 7.4V • 2 charging pads in series – 10V for charging • Charging Chip (MCP73213) • Fuel Gauge (DS2782) • Utilize 5V and 3.3V Linear Regulator (AP1117-Y50G & AP1117-Y33G)

  8. Linear Regulators

  9. Charging Circuit

  10. Motor Control Circuit • 5 volt operation • 4 H-Bridges (BD6211F-E2) • 4 MOSFETs • Turns signal for motor on or off • One for each motor

  11. H-Bridges & Motors

  12. Sensor Circuit • 3.3V Operation • 4 Sonar Sensors (MB1240) • ATD • Accelerometer (LIS331) • I2C • Compass (HMC5883LSMD) • I2C

  13. Sensor Circuit

  14. Wireless Breakout • WiFly GSX Breakout (WRL-10050) • 3.3V Operation • UART

  15. Questions?

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