8

Systems Design: Digital and Analog Interfacing Methods

Chapter Outline

  • Study interfacing circuits of keys with the MCUs
  • Learn interfacing circuits with physical devices as follows : LEDs, LCD, touch screen, printer, motors, coils, sensors, displacement and rotation encoders
  • Know how an MCU drives the lOs at large voltages and currents.
  • Know how an MCU is used in the robots, instruments and control systems using the appropriately designed interfaces for a system
8.1 INTERFACING OF THE KEY (SWITCH), KEYPAD AND KEYBOARD

8.1.1 A Single Key (switch) and Its Interface

A key (switch) switch interfaces with the port using two signals. One signal is called scan (strobe). Second is called return (sense). Scan and sense signals are between the key ...

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