The learner will review code and answer questions about the digitalWrite, delay, and PinMode functions.
Setting Output Pin Modes & Writing to Digital Outputs
All the flashcards in this set deal with the following code:
int ledPin = 1;
void setup()
{
pinMode(ledPin, OUTPUT);
}
void main()
{
digitalWrite(ledPin, HIGH);
delay(1000);
digitalWrite(ledPin, LOW);
delay(1000);
}
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 Output Pin Modes & Writing to Digital Outputs
Correct!
All the flashcards in this set deal with the following code:
int ledPin = 1;
void setup()
{
pinMode(ledPin, OUTPUT);
}
void main()
{
digitalWrite(ledPin, HIGH);
delay(1000);
digitalWrite(ledPin, LOW);
delay(1000);
}
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 Output Pin Modes & Writing to Digital Outputs
Incorrect
All the flashcards in this set deal with the following code:
int ledPin = 1;
void setup()
{
pinMode(ledPin, OUTPUT);
}
void main()
{
digitalWrite(ledPin, HIGH);
delay(1000);
digitalWrite(ledPin, LOW);
delay(1000);
}
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 Output Pin Modes & Writing to Digital Outputs
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Correct!
What type of variable is ledPin?
Correct Answer
integer
On the first line of code we have int ledPin = 1; thus ledPin is an int type, which is short for integer.
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Incorrect
What type of variable is ledPin?
Your Answer
Correct Answer
integer
On the first line of code we have int ledPin = 1; thus ledPin is an int type, which is short for integer.
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Correct!
Which output pin will be accessed?
Correct Answer
1
The digitalWrite function accesses the pin with number ledPin (both times it is called). Since, from line one, ledPin = 1, digitalWrite accesses pin 1.
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Incorrect
Which output pin will be accessed?
Your Answer
Correct Answer
1
The digitalWrite function accesses the pin with number ledPin (both times it is called). Since, from line one, ledPin = 1, digitalWrite accesses pin 1.
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Correct!
Can the variable ledPin be assigned a negative value?
Correct Answer
Yes
Since ledPin is an integer, it can have a negative value assigned to it.
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Incorrect
Can the variable ledPin be assigned a negative value?
Your Answer
Correct Answer
Yes
Since ledPin is an integer, it can have a negative value assigned to it.
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
In the main function, what does the line digitalWrite(ledPin, HIGH); do?
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Correct!
In the main function, what does the line digitalWrite(ledPin, HIGH); do?
Correct Answer
sets output 1 high
The digitalWrite function takes two arguments. The first argument, which is ledPin here, says what pin to write to. In this case, since ledPin = 1, it writes to pin 1. The second argument, which is HIGH here, says what to write, in this case it writes HIGH.
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Incorrect
In the main function, what does the line digitalWrite(ledPin, HIGH); do?
Your Answer
Correct Answer
sets output 1 high
The digitalWrite function takes two arguments. The first argument, which is ledPin here, says what pin to write to. In this case, since ledPin = 1, it writes to pin 1. The second argument, which is HIGH here, says what to write, in this case it writes HIGH.
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
What would happen if the line digitalWrite(HIGH, ledpin); was executed in the main function of this program?
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Correct!
What would happen if the line digitalWrite(HIGH, ledpin); was executed in the main function of this program?
Correct Answer
It would set output 1 to high.
Here we have to remember that the value HIGH is the same as 1. Also recall we set ledPin to 1. Thus the call of digitalWrite(HIGH, ledPin) is the same as digitalWrite(1, 1), which would write to pin 1 (the first argument) the value of 1 or HIGH (the second argument).
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Incorrect
What would happen if the line digitalWrite(HIGH, ledpin); was executed in the main function of this program?
Your Answer
Correct Answer
It would set output 1 to high.
Here we have to remember that the value HIGH is the same as 1. Also recall we set ledPin to 1. Thus the call of digitalWrite(HIGH, ledPin) is the same as digitalWrite(1, 1), which would write to pin 1 (the first argument) the value of 1 or HIGH (the second argument).
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
What would the following code try to do if it was executed in the body of the main function? digitalWrite(ledpin + 2, LOW);
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Correct!
What would the following code try to do if it was executed in the body of the main function? digitalWrite(ledpin + 2, LOW);
Correct Answer
set output 3 low
The digitalWrite function will try to set "ledPin + 2" to "LOW". We set ledPin = 1, so ledPin + 2 = 3. Thus digitalWrite(ledPin + 2, LOW); is the same as digitalWrite(3, LOW); and it will try to set output 3 to LOW.
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Incorrect
What would the following code try to do if it was executed in the body of the main function? digitalWrite(ledpin + 2, LOW);
Your Answer
Correct Answer
set output 3 low
The digitalWrite function will try to set "ledPin + 2" to "LOW". We set ledPin = 1, so ledPin + 2 = 3. Thus digitalWrite(ledPin + 2, LOW); is the same as digitalWrite(3, LOW); and it will try to set output 3 to LOW.
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Correct!
How long of a time delay would delay(2500); produce?
Correct Answer
2.5 seconds
Recall the delay function has one argument and it pauses the program for that many milliseconds. Thus a delay(2500); will pause the program for 2.5 seconds.
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Incorrect
How long of a time delay would delay(2500); produce?
Your Answer
Correct Answer
2.5 seconds
Recall the delay function has one argument and it pauses the program for that many milliseconds. Thus a delay(2500); will pause the program for 2.5 seconds.
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
How long of a time delay would delay(100); produce?
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Correct!
How long of a time delay would delay(100); produce?
Correct Answer
all of the above
delay(100); will certainly pause the program for 100 milliseconds. But the other times given are also equal to 100 milliseconds, so all of the above is correct.
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Incorrect
How long of a time delay would delay(100); produce?
Your Answer
Correct Answer
all of the above
delay(100); will certainly pause the program for 100 milliseconds. But the other times given are also equal to 100 milliseconds, so all of the above is correct.
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Correct!
True or False: Instead of int, we could have set ledPin to be of type float.
Correct Answer
False
We should never use float variables for values we are going to test for equality or as arguments in functions that take integer arguments, like pinMode and digitalWrite.
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Incorrect
True or False: Instead of int, we could have set ledPin to be of type float.
Your Answer
Correct Answer
False
We should never use float variables for values we are going to test for equality or as arguments in functions that take integer arguments, like pinMode and digitalWrite.
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Correct!
True or False: This program turns 2 different LEDs on and off.
Correct Answer
False
This program only affects pin 1.
Question 1 of 10
Setting Output Pin Modes & Writing to Digital Outputs
Incorrect
True or False: This program turns 2 different LEDs on and off.
Your Answer
Correct Answer
False
This program only affects pin 1.
Question 1 of 10
Score
You have answered 5 of 10 questions correctly.
50%
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- Author
- Published
- 6/2/2015
- Last Updated
- 6/2/2015
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Setting Output Pin Modes & Writing to Digital Outputs by Fox Valley Technical College is licensed under a Creative Commons Attribution 3.0 Unported License.