The learner will review code and answer questions about the pinMode, digitalWrite, and digitalRead functions.
Setting Input Pin Modes & Reading Digital Inputs
All the flashcards in this set deal with the following code:
int ledPin = 1;
int inPin = 10;
int value = 0;
void setup()
{
pinMode(ledPin, OUTPUT);
pinMode(inPin, INPUT);
}
void main()
{
value = digitalRead(inPin);
digitalWrite(ledPin, value);
delay(5000);
value = 0;
digitalWrite(ledPin, value);
}
This code is displayed in the image below, which will be on each card, but you may want to make note of it before going on.
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Correct!
All the flashcards in this set deal with the following code:
int ledPin = 1;
int inPin = 10;
int value = 0;
void setup()
{
pinMode(ledPin, OUTPUT);
pinMode(inPin, INPUT);
}
void main()
{
value = digitalRead(inPin);
digitalWrite(ledPin, value);
delay(5000);
value = 0;
digitalWrite(ledPin, value);
}
This code is displayed in the image below, which will be on each card, but you may want to make note of it before going on.
Correct Answer
Got it!
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Incorrect
All the flashcards in this set deal with the following code:
int ledPin = 1;
int inPin = 10;
int value = 0;
void setup()
{
pinMode(ledPin, OUTPUT);
pinMode(inPin, INPUT);
}
void main()
{
value = digitalRead(inPin);
digitalWrite(ledPin, value);
delay(5000);
value = 0;
digitalWrite(ledPin, value);
}
This code is displayed in the image below, which will be on each card, but you may want to make note of it before going on.
Your Answer
Correct Answer
Got it!
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
True or False: The variables could have been declared as int ledPin, inPin, value; and then had values assigned to them in the main program.
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Correct!
True or False: The variables could have been declared as int ledPin, inPin, value; and then had values assigned to them in the main program.
Correct Answer
True
That is a valid way to declare variables.
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Incorrect
True or False: The variables could have been declared as int ledPin, inPin, value; and then had values assigned to them in the main program.
Your Answer
Correct Answer
True
That is a valid way to declare variables.
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
True or False: A digital pin can be assigned as both an input and an output at the same time.
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Correct!
True or False: A digital pin can be assigned as both an input and an output at the same time.
Correct Answer
False
A digital pin can only be one or the other at any specific time.
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Incorrect
True or False: A digital pin can be assigned as both an input and an output at the same time.
Your Answer
Correct Answer
False
A digital pin can only be one or the other at any specific time.
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
True or False: It would be syntactically correct to have a third function call like pinMode(ledPin, INPUT); in the setup function.
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Correct!
True or False: It would be syntactically correct to have a third function call like pinMode(ledPin, INPUT); in the setup function.
Correct Answer
True
Although this would probably lead to confusion for anyone reviewing the code, the syntax of the statement is correct and the program should compile.
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Incorrect
True or False: It would be syntactically correct to have a third function call like pinMode(ledPin, INPUT); in the setup function.
Your Answer
Correct Answer
True
Although this would probably lead to confusion for anyone reviewing the code, the syntax of the statement is correct and the program should compile.
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Correct!
The digitalRead function in the main function reads from which pin?
Correct Answer
10
The line value = digitalRead(inPin); is going to read the value of whichever pin inPin is. Since we have int inPin = 10; and we have not changed its value since then, digitalRead(inPin) is the same as digitalRead(10) and it will read the digital input on pin 10.
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Incorrect
The digitalRead function in the main function reads from which pin?
Your Answer
Correct Answer
10
The line value = digitalRead(inPin); is going to read the value of whichever pin inPin is. Since we have int inPin = 10; and we have not changed its value since then, digitalRead(inPin) is the same as digitalRead(10) and it will read the digital input on pin 10.
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
What is the result of the first two lines of code in the main function (restated below)?
value = digitalRead(inPin);
digitalWrite(ledPin, value);
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Correct!
What is the result of the first two lines of code in the main function (restated below)?
value = digitalRead(inPin);
digitalWrite(ledPin, value);
Correct Answer
Pins 1 and 10 will have the same value.
Those lines of code read the value of pin 10 (since inPin = 10) and write that value to pin 1 (since ledPin = 1).
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Incorrect
What is the result of the first two lines of code in the main function (restated below)?
value = digitalRead(inPin);
digitalWrite(ledPin, value);
Your Answer
Correct Answer
Pins 1 and 10 will have the same value.
Those lines of code read the value of pin 10 (since inPin = 10) and write that value to pin 1 (since ledPin = 1).
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Correct!
After the program runs through one time, is the LED on or off?
Correct Answer
Off
The last two lines of code first set value to 0, value = 0;, and then write that to ledPin, digitalWrite(ledPin, value). Since a value of 0 is off, the LED will be off.
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Incorrect
After the program runs through one time, is the LED on or off?
Your Answer
Correct Answer
Off
The last two lines of code first set value to 0, value = 0;, and then write that to ledPin, digitalWrite(ledPin, value). Since a value of 0 is off, the LED will be off.
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Assume the clock speed is 10 MHz. If the delay call were not in the program, would you be able to see the LED turn on?
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Correct!
Assume the clock speed is 10 MHz. If the delay call were not in the program, would you be able to see the LED turn on?
Correct Answer
No
With a clock speed of 10 MHz (10 million cycles per second), the LED would not be left on for long enough to be seen.
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Incorrect
Assume the clock speed is 10 MHz. If the delay call were not in the program, would you be able to see the LED turn on?
Your Answer
Correct Answer
No
With a clock speed of 10 MHz (10 million cycles per second), the LED would not be left on for long enough to be seen.
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
What does the code value = digitalRead(inPin); do?
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Correct!
What does the code value = digitalRead(inPin); do?
Correct Answer
It assigns the variable value inPin's value
The assign operation, namely =, takes the value on the right and attempts to assign it to the variable on the left. Here, digitalRead(inPin) is found and then that value is assigned to the variable value.
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Incorrect
What does the code value = digitalRead(inPin); do?
Your Answer
Correct Answer
It assigns the variable value inPin's value
The assign operation, namely =, takes the value on the right and attempts to assign it to the variable on the left. Here, digitalRead(inPin) is found and then that value is assigned to the variable value.
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Correct!
True or False: The variable inPin can have a value of 1.5.
Correct Answer
False
The variable inPin is of type int, so it can only have integer values assigned to it.
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Incorrect
True or False: The variable inPin can have a value of 1.5.
Your Answer
Correct Answer
False
The variable inPin is of type int, so it can only have integer values assigned to it.
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Correct!
The code value = digitalRead(inPin + 2); will attempt to read which input?
Correct Answer
12
Since inPin = 10, the function digitalRead(inPin + 2) is the same as the function digitalRead(10 + 2) which, again, is the same as digitalRead(12).
Question 1 of 10
Setting Input Pin Modes & Reading Digital Inputs
Incorrect
The code value = digitalRead(inPin + 2); will attempt to read which input?
Your Answer
Correct Answer
12
Since inPin = 10, the function digitalRead(inPin + 2) is the same as the function digitalRead(10 + 2) which, again, is the same as digitalRead(12).
Question 1 of 10
Score
You have answered 5 of 10 questions correctly.
50%
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Question 1 of 10
- Author
- Published
- 6/2/2015
- Last Updated
- 6/2/2015
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Setting Input Pin Modes & Reading Digital Inputs by Fox Valley Technical College is licensed under a Creative Commons Attribution 3.0 Unported License.