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

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Presentation 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

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 LOW “HIGH” time

PULSE WIDTH MODULATION (PWM) Duty cycle On Time Off Time

PULSE WIDTH MODULATION (PWM) Example

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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