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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. - PowerPoint PPT Presentation
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R3
Ethan HallMichael KeltonGreg 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
• Microcontroller• Power Supply• Motor Control Circuit• Sensor Circuit• Wireless Communication Breakout
Microcontroller
• LPC1768– 32 bit ARM Cortex M3– 512 kB Flash; 32kB SRAM– I2C; UART; USB; PWM– Run at 3.3V
Microcontroller
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)
Linear Regulators
Charging Circuit
Motor Control Circuit
• 5 volt operation• 4 H-Bridges (BD6211F-E2)• 4 MOSFETs
– Turns signal for motor on or off– One for each motor
H-Bridges & Motors
Sensor Circuit
• 3.3V Operation• 4 Sonar Sensors (MB1240)
– ATD
• Accelerometer (LIS331)– I2C
• Compass (HMC5883LSMD)– I2C
Sensor Circuit
Wireless Breakout
• WiFly GSX Breakout (WRL-10050)– 3.3V Operation– UART
Questions?