Presentation on theme: "Output Actuators and Drive Techniques by Prof. Bitar."— Presentation transcript:
Output Actuators and Drive Techniques by Prof. Bitar
System Level Block Diagram C onsidering the Processing Block to Output Actuator Interface Input Sensor(s) Processing Output Actuator(s)
What are the Possible Outputs? LCD Display (7-Segment, Dot-Matrix…) LED Display (7-Segment…) Discrete LED’s Alarms (Speaker, Piezo-Electric…) Computer Interface (USB, Serial, Parallel…) Wireless (Blue Tooth, WiFi, ZigBee…)
Possible Displays… Images from www.digikey.com.www.digikey.com
Audible Devices… Note: Images from www.digikey.com.www.digikey.com
Computer Interfaces… Note: Images from www.digikey.com.www.digikey.com
Cheap Wireless Modules… Available at www.sparkfun.comwww.sparkfun.com Note: Images from www.sparkfun.com.www.sparkfun.com
Processor Block to Output Device Interfacing Concerns Voltage Level Concerns Load Current Requirements Protocols (for Computer Interfacing)
Example 1: LCD Display Specification Sheet (Often a BAD Choice for ECE2799) Note: Image from www.digikey.com.www.digikey.com
Example 2: LCD Module Specification Sheet (A Better Choice for ECE2799) Note: Image from www.digikey.com.www.digikey.com
Microcontroller Development Boards? (Definitely a Time Saver) Note: Images from www.sparkfun.com.www.sparkfun.com
Basic Drive Techniques Consider a typical Red LED IFIF +VF-+VF- I F = 20mA V F = 2.1V What are some of the concerns here? How many LED’s are you trying to drive? Can the Processing Block handle this?
Possible Solution(s) Using a Transistor or MOSFET Driver Processing Block VCC Q1 RB R1 LED1 VDD LED1 T1 R1
Piezo Alarm Example External vs. Internal Drive External Drive means that a switching signal in the audible range of frequencies must be provided. Internal Drive means that the oscillating circuit is self-contained in the device.
Piezo Alarm Example Note: Image from www.digikey.com.www.digikey.com