tony yi 5/2/2015 ceng4480 tutorial 3. about me i am “the other” tutor of ceng4480 you can find...
TRANSCRIPT
Tony Yi
5/2/2015
CENG4480 TUTORIAL 3
ABOUT ME
• I am “the other” tutor of CENG4480
• You can find me at Rm116 in SHB
• Email : [email protected]
THE FULL PICTURE
Environment
Sensor
Input
Control System
Actuator
Output
We focus on this part.
ACTUATOR
• To convert the digital signals into mechanic motion
• Motor (mainly), heater, buzzer, LED, LCD
Internal Signal Actuator Feedback
ACTUATOR
• Introduce Pulse-Width-Modulation (PWM)
• Focus on servo motor
Internal Signal Actuator Feedback
PULSE WIDTH MODULATION (PWM)
• Pulse-width-modulation (PWM) is a fancy term for describing a type of digital signal
• Changing ‘HIGH’ time of the output signal
HIGH
LOWLOW
“HIGH” time
PULSE WIDTH MODULATION (PWM)
• Duty cycle On Time
Off Time
* 100%
PULSE WIDTH MODULATION (PWM)
• Example
• https://www.youtube.com/watch?v=X1ZmNHg0G30
SERVO MOTOR
• A servomotor is a rotary actuator that allows for precise control of angular position, velocity and acceleration.
SERVO MOTOR
• Small device that has an output shaft
• Angular position of that shaft controlled by the input signal (typically PWM) Shaft
Body
Input Signal
SERVO MOTOR
• A servo motor itself is a close loop control system.
Gear
Control Circuit
Position Sensor(connected to shaft)
DC Motor
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