Arduino Review 1

Consider the following c++ code used for programming an Arduino uno:

pinMode(12, OUTPUT);

What is the effect of this code on the Arduino uno?

• Pin 12 is set to HIGH by default.
• Pin 12 is configured as an output pin.
• Pin 12 is configured as an input pin.
• Pin 12 is disabled and cannot be used.

You are programming an Arduino Uno and wish to use pin 8 to read data from a connected component. What c++ code should you write?

• pinMode(8, OUTPUT); int value = digitalWrite(8);
• int value = analogRead(8); pinMode(8, INPUT);
• digitalRead(8); pinMode(8, INPUT_PULLUP);
• pinMode(8, INPUT); int value = digitalRead(8);

You are programming an Arduino uno using c++ code. You add code the the void setup() function. When will that code be executed and how many times will it run?

• The code will run continuously until stopped.
• The code will be executed every time the loop runs.
• The code will be executed twice.
• The code will be executed once when the Arduino powers on.

You are programming an Arduino uno using c++. The Uno has LED lights connected to pins 4,5,6,and 7. How would you program the arduino to light the LEDs sequentially from 4 to 7 for 200ms each?

• void setup() { pinMode(4, OUTPUT); pinMode(5, OUTPUT); pinMode(6, OUTPUT); pinMode(7, OUTPUT); } void loop() { for (int pin = 4; pin <= 7; pin++) { digitalWrite(pin, HIGH); delay(200); digitalWrite(pin, LOW); } }
• void setup() { pinMode(4, OUTPUT); pinMode(5, OUTPUT); } void loop() { digitalWrite(4, HIGH); delay(200); digitalWrite(5, HIGH); delay(200); }
• void setup() { pinMode(4, OUTPUT); } void loop() { for (int pin = 4; pin < 7; pin++) { digitalWrite(pin, HIGH); delay(200); } }
• void setup() { pinMode(4, INPUT); } void loop() { digitalWrite(4, HIGH); delay(200); }

You are programming an Arduino Uno using c++. You wish to read and write data from the serial monitor. What method must you call prior to reading from or writing to the serial monitor?

• Serial.read()
• Serial.start(baud_rate)
• Serial.begin(baud_rate)
• Serial.writeData()

When programming an Arduino Uno in c++ to write information to the serial monitor, what is the difference between Serial.print() and Serial.println()?

• Serial.print() can only print integers, while Serial.println() can print all data types.
• Serial.print() adds a newline, while Serial.println() does not.
• Serial.print() is used for debugging, while Serial.println() is for data logging.
• Serial.print() does not add a newline, while Serial.println() does.

A function is a series of programming statements that can be called by name. Which command is called repetitively over and over again as long as the Arduino has power.

• loop()
• setup()
• (output)
• (input)

This pauses the program for the amount of time (in miliiseconds) specified as parameter. (There are 1000 milliseconds in a second.)

• loop ( )

• delay( )

• setup ( )

• input( )

You are programming an Arduino Uno in c++. You have a push button connected and set to INPUT_PULLUP resistor mode. What value will the Uno detect when the button is pressed?

• LOW
• UNDEFINED
• FLOAT
• HIGH

You are programming an Arduino Uno in c++. Which of the following are valid syntax for incrementing a variable i by 1?

• i++

• i--
• i := i + 1
• i = i + 1