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Interfacing to External Devices

Interfacing to External Devices. Explore Digital Interfaces techniques Introduce some complex optical devices and how to interface them Describe methods for switching devices on and off. Interfacing Digital Input Signals. General requirements of all digital input signals:

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Interfacing to External Devices

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  1. Interfacing to External Devices Explore Digital Interfaces techniques Introduce some complex optical devices and how to interface them Describe methods for switching devices on and off

  2. Interfacing Digital Input Signals • General requirements of all digital input signals: • The voltage input level should only be the legal allowed voltage. • They should not be corrupted by glitches • They should switch cleanly and fast.

  3. Forms of Signal Degradation

  4. Simple Interfacing for Digital Signals

  5. Switch Debouncing • Switch debouncing happens when mechanical contacts switch and thus from the force of the switching they bounce for a few milliseconds.

  6. Actual switch Bounce Signal

  7. Hardware Methods for Debouncing

  8. Software method of Debouncing 1

  9. Software method of Debouncing 2

  10. Interfacing Keypads 1

  11. Interfacing Keypads 2

  12. Keypad Scanning Algorithm

  13. Optical Devices: Single 7-segment Display

  14. Optical Devices: Multiplexed 7-segment Display

  15. Optical Devices: Example Circuit

  16. Optical Devices: Opto-Isolator

  17. Object Sensors

  18. Shaft Encoders Angular Speed S = output frequency / number of holes revolutions per second This setup does not give indication of direction

  19. Incremental Quadrature Shaft Encoder

  20. Absolute Shaft Encoders

  21. Inductive Load Switching

  22. Examples of Inductive Loads

  23. Mechanical Relays

  24. The use of H-Bridge 1

  25. The use of H-Bridge 2

  26. The use of H-Bridge 3

  27. The use of H-Bridge 4

  28. Semiconductor H-Bridge 1

  29. Semiconductor H-Bridge 2 http://www.dprg.org/tutorials/1998-04a/

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