Output Actuators and Drive Techniques

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Output Actuators and Drive Techniques

• by
• Prof. Bitar

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System Level Block DiagramConsidering the
Processing Block to Output Actuator Interface
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What are the Possible Outputs?

• LCD Display (7-Segment, Dot-Matrix)
• LED Display (7-Segment)
• Discrete LEDs
• Alarms (Speaker, Piezo-Electric)
• Computer Interface (USB, Serial, Parallel)
• Wireless (Blue Tooth, WiFi, ZigBee)

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Possible Displays
Images from www.digikey.com .
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Audible Devices
Note Images from www.digikey.com .
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Computer Interfaces
Note Images from www.digikey.com .
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Cheap Wireless Modules

• Available at www.sparkfun.com

Note Images from www.sparkfun.com .
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Processor Block to Output Device Interfacing
Concerns

• Voltage Level Concerns
• Load Current Requirements
• Protocols (for Computer Interfacing)

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Example 1 LCD Display Specification
Sheet(Often a BAD Choice for ECE2799)
Note Image from www.digikey.com .
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Example 2 LCD Module Specification Sheet(A
Better Choice for ECE2799)
Note Image from www.digikey.com .
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Microcontroller Development Boards?(Definitely a
Time Saver)
Note Images from www.sparkfun.com .
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Basic Drive Techniques

• Consider a typical Red LED

• What are some of the concerns here?
• How many LEDs are you trying to drive?
• Can the Processing Block handle this?

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Possible Solution(s)

• Using a Transistor or MOSFET Driver

Processing Block
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Piezo Alarm ExampleExternal 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.

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Piezo Alarm Example
Note Image from www.digikey.com .