Microprocessors Module 3 - I/O Device Interfacing

What is the purpose of the pinMode function in the Arduino code?

In the digital input example, what happens when the pushbutton is closed?

Which component is used to control high current loads in Arduino projects?

Which function in the code is used to keep the LED on for a second?

What is the maximum current output of the Arduino's standard digital pins?

What does the digitalWrite function do in the examples provided?

What variable is used to represent the LED pin in the digital output example?

How does the code control a MOSFET to manage higher current loads?

What is the role of the void setup() function in Arduino programming?

Interfacing of I/O Devices

Various devices can be interfaced with microcontrollers, enhancing their interaction capabilities.
Manipulating microcontroller ports allows for data input (from sensors) and output (to actuators).

Digital Output

A basic program to toggle an LED on and off demonstrates digital output.
LED connected to pin 13 blinks every second using digitalWrite function.
Built-in resistor for pin 13 allows direct connection to an LED without additional circuitry.

Digital Input

Digital input has two states: HIGH (on) and LOW (off).
Example uses a pushbutton connected to pin 2; closing the switch reads HIGH and activates the LED on pin 13.
digitalRead function checks the state of the input pin to control the LED.

High Current Output

Controlling loads over 40mA from Arduino requires using a MOSFET or transistor for handling higher current.
Example turns a MOSFET on and off five times per second to control a motor.
Implementation may include protective components like a diode for non-inductive loads.

Analog Output

Example demonstrates controlling LED brightness using PWM (Pulse Width Modulation) via analogWrite.
Variable delayVal() can be used to modify brightness dynamically.
Loop structure allows for gradual changes in LED intensity, enhancing visual feedback through gradual dimming effects.

This quiz focuses on the interfacing of I/O devices with microcontrollers, specifically for Module 3 of Microprocessors. Students will learn how to manipulate the ports of a microcontroller to manage both output and input data. Additionally, the quiz includes a practical example of a basic digital output program for blinking an LED.