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lecture 6 Parts Design Choices(part2)

lecture 6 Parts Design Choices(part2). Motor/Encoder. P/N mosfet type w/ level shifter Motor driver. N/N mosfet type half H-bridge w/ boost converter level shifter. N/N mosfet type All-In-One motor driver. Encoder. Provided with eagle library for kitmouse Either 3.3V-5V supply.

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lecture 6 Parts Design Choices(part2)

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  1. lecture 6 Parts Design Choices(part2)

  2. Motor/Encoder

  3. P/N mosfet type w/ level shifter Motor driver

  4. N/N mosfet type half H-bridge w/ boost converter level shifter

  5. N/N mosfet type All-In-One motor driver

  6. Encoder • Provided with eagle library for kitmouse • Either 3.3V-5V supply

  7. User Interface

  8. LED • 2 ways to control LED with MCU • The one on left is easier for wiring since ground is easier to find • The way to the right is better MCU since it doesn’t draw power from MCU

  9. button

  10. Button Shared with Boot0 • To save one more button

  11. Reset Button • Reset instead of re-power • Helpful for Bluetooth, no re-pair needed is just reset instead of power it off and on

  12. Buzzer • PWM Driven • Optional diode to prevent kick-back current from buzzer • Must be magnetic buzzer(w/polarities)

  13. Display • Optional • Costly but takes less time than serial print • Real time date output

  14. Device

  15. Gyro • Power sensitive, make clean power and ground • Doesn’t have to place in the middle of mouse

  16. MCU • We use STM32F405RG as MCU • All VCAP and VDD VSS should connect as what indicated here • Boot0/boot1/reset should be connected as well • Connect programmer and USART port

  17. Communication Port • Basic 8 pin config • Need 3.3V for USART side for Bluetooth Power • Follow the pin order in picture in order to compatible with existing gadgets we have

  18. Voltage Meter • Need to detect battery voltage in order to protect battery • Choose resistor wisely to prevent ADC reading saturation • Resistor supposed to be K level

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