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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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