Lecture 6 Parts Design Choices(part2). Motor/Encoder.

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Presentation transcript:

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

User Interface

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

button

Button Shared with Boot0 To save one more button

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

Buzzer PWM Driven Optional diode to prevent kick-back current from buzzer Must be magnetic buzzer(w/polar ities)

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

Device

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

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

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

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