The learner will review code and answer questions about an analog read.
Analog Input Reading
All the flashcards in this set deal with the following code:
/*Assume a 10 bit analog to digital converter. Assume maximum analog input is 5 VDC. Thus a 5 volt input would be read as 1023, a 2.5 volt input would be read as 512, and a 0 volt input would be read as 0. */
int analogPin = 1;
int value = 0;
void setup()
{
Serial.begin(9600);
}
void main()
{
value = analogRead(analogPin);
Serial.println(value);
}
The 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
Analog Input Reading
Correct!
All the flashcards in this set deal with the following code:
/*Assume a 10 bit analog to digital converter. Assume maximum analog input is 5 VDC. Thus a 5 volt input would be read as 1023, a 2.5 volt input would be read as 512, and a 0 volt input would be read as 0. */
int analogPin = 1;
int value = 0;
void setup()
{
Serial.begin(9600);
}
void main()
{
value = analogRead(analogPin);
Serial.println(value);
}
The 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
Analog Input Reading
Incorrect
All the flashcards in this set deal with the following code:
/*Assume a 10 bit analog to digital converter. Assume maximum analog input is 5 VDC. Thus a 5 volt input would be read as 1023, a 2.5 volt input would be read as 512, and a 0 volt input would be read as 0. */
int analogPin = 1;
int value = 0;
void setup()
{
Serial.begin(9600);
}
void main()
{
value = analogRead(analogPin);
Serial.println(value);
}
The 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
Analog Input Reading
Correct!
Which analog input channel is read?
Correct Answer
1
The line value = analogRead(analogPin); calls the analogRead function on the value stored in analogPin. That value was set to 1.
Question 1 of 10
Analog Input Reading
Incorrect
Which analog input channel is read?
Your Answer
Correct Answer
1
The line value = analogRead(analogPin); calls the analogRead function on the value stored in analogPin. That value was set to 1.
Question 1 of 10
Analog Input Reading
Question 1 of 10
Analog Input Reading
Correct!
The analogRead function accepts which type of argument?
Correct Answer
Integer
The analogRead function takes an integer argument.
Question 1 of 10
Analog Input Reading
Incorrect
The analogRead function accepts which type of argument?
Your Answer
Correct Answer
Integer
The analogRead function takes an integer argument.
Question 1 of 10
Analog Input Reading
Assume 2.5 VDC is applied to analog input 2 and we run the program. What number will value have?
Question 1 of 10
Analog Input Reading
Correct!
Assume 2.5 VDC is applied to analog input 2 and we run the program. What number will value have?
Correct Answer
unknown
Since our program is not reading from analog input 2, we would need to know the input, if any, on input 1 to know what value the variable value will have.
Question 1 of 10
Analog Input Reading
Incorrect
Assume 2.5 VDC is applied to analog input 2 and we run the program. What number will value have?
Your Answer
Correct Answer
unknown
Since our program is not reading from analog input 2, we would need to know the input, if any, on input 1 to know what value the variable value will have.
Question 1 of 10
Analog Input Reading
Question 1 of 10
Analog Input Reading
Correct!
Which input would analogRead attempt to read in this code: analogRead(analogPin + 3);
Correct Answer
4
It would try to read input 4 since analogPin = 1, digitalRead(analogPin + 3) is the same as digitalRead(1 + 3) which is digitalRead(4).
Question 1 of 10
Analog Input Reading
Incorrect
Which input would analogRead attempt to read in this code: analogRead(analogPin + 3);
Your Answer
Correct Answer
4
It would try to read input 4 since analogPin = 1, digitalRead(analogPin + 3) is the same as digitalRead(1 + 3) which is digitalRead(4).
Question 1 of 10
Analog Input Reading
The Serial.println command prints the numerical content of the variable value in this program. If 1.25 VDC is applied to analog input 1, what value would be printed?
Question 1 of 10
Analog Input Reading
Correct!
The Serial.println command prints the numerical content of the variable value in this program. If 1.25 VDC is applied to analog input 1, what value would be printed?
Correct Answer
256
Since the maximum analog input is 5 VDC which gives a reading of 1023, we can use a proportion to find the reading of 1.25 VDC. . Solving this proportion gives x is 255.75, which rounds to 256.
Question 1 of 10
Analog Input Reading
Incorrect
The Serial.println command prints the numerical content of the variable value in this program. If 1.25 VDC is applied to analog input 1, what value would be printed?
Your Answer
Correct Answer
256
Since the maximum analog input is 5 VDC which gives a reading of 1023, we can use a proportion to find the reading of 1.25 VDC. . Solving this proportion gives x is 255.75, which rounds to 256.
Question 1 of 10
Analog Input Reading
Question 1 of 10
Analog Input Reading
Correct!
Which input would be read if we used the code analogRead(analogpin);?
Correct Answer
Compile error
The variable name analogpin is not defined. Recall that variables are case sensitive.
Question 1 of 10
Analog Input Reading
Incorrect
Which input would be read if we used the code analogRead(analogpin);?
Your Answer
Correct Answer
Compile error
The variable name analogpin is not defined. Recall that variables are case sensitive.
Question 1 of 10
Analog Input Reading
What is the range of values analogPin can have in this example?
Question 1 of 10
Analog Input Reading
Correct!
What is the range of values analogPin can have in this example?
Correct Answer
0 to 1023
The analogPin variable could be any of the numbers from 0 to 1023. Note that 1024 is outside the range of what can be read (since we only have a 10 bit converter).
Question 1 of 10
Analog Input Reading
Incorrect
What is the range of values analogPin can have in this example?
Your Answer
Correct Answer
0 to 1023
The analogPin variable could be any of the numbers from 0 to 1023. Note that 1024 is outside the range of what can be read (since we only have a 10 bit converter).
Question 1 of 10
Analog Input Reading
True or False: We could simplify the main function to the following single line: Serial.println(analogRead(analogPin));.
Question 1 of 10
Analog Input Reading
Correct!
True or False: We could simplify the main function to the following single line: Serial.println(analogRead(analogPin));.
Correct Answer
True
This would work (assuming we always wanted to print the value of analogPin instead of being able to easily comment that line out for when we are not debugging). The line Serial.println(analogRead(analogPin)); would first read the value of pin number analogPin. Then it would print that value.
Question 1 of 10
Analog Input Reading
Incorrect
True or False: We could simplify the main function to the following single line: Serial.println(analogRead(analogPin));.
Your Answer
Correct Answer
True
This would work (assuming we always wanted to print the value of analogPin instead of being able to easily comment that line out for when we are not debugging). The line Serial.println(analogRead(analogPin)); would first read the value of pin number analogPin. Then it would print that value.
Question 1 of 10
Analog Input Reading
Question 1 of 10
Analog Input Reading
Correct!
True or False: In this example, value could have been of type Char (an 8-bit data type).
Correct Answer
False
A Char type would not be large enough to hold the 10-bit date created by the converter.
Question 1 of 10
Analog Input Reading
Incorrect
True or False: In this example, value could have been of type Char (an 8-bit data type).
Your Answer
Correct Answer
False
A Char type would not be large enough to hold the 10-bit date created by the converter.
Question 1 of 10
Analog Input Reading
If we changed the code in the main function as written below, what would be printed if the analog input had 2.5 VDC applied to it?
Serial.println(value);
value = analogRead(analogPin);
Question 1 of 10
Analog Input Reading
Correct!
If we changed the code in the main function as written below, what would be printed if the analog input had 2.5 VDC applied to it?
Serial.println(value);
value = analogRead(analogPin);
Correct Answer
0
Since we set variable value = 0 when we initialized it and we are printing it before it is assigned the value from the analogRead function, it will still be 0 and that is what will be printed.
Question 1 of 10
Analog Input Reading
Incorrect
If we changed the code in the main function as written below, what would be printed if the analog input had 2.5 VDC applied to it?
Serial.println(value);
value = analogRead(analogPin);
Your Answer
Correct Answer
0
Since we set variable value = 0 when we initialized it and we are printing it before it is assigned the value from the analogRead function, it will still be 0 and that is what will be printed.
Question 1 of 10
No Comments Yet
Analog Input Reading by Fox Valley Technical College is licensed under a Creative Commons Attribution 3.0 Unported License.