Why ADC is needed in Embedded C - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an ADC input pin.

Embedded C

int adc_pin = [1];

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A13

BLED_BUILTIN

CD13

DA0

Attempts:

3 left

💡 Hint

Common Mistakes

Using a digital pin number instead of an analog pin label.

The ADC input pin is usually labeled as A0, A1, etc. Here, A0 is the correct analog input pin.

2fill in blank

medium

Complete the code to read the analog value from the ADC pin.

Embedded C

int sensor_value = [1](adc_pin);

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AdigitalRead

BanalogRead

CreadADC

DgetAnalog

Attempts:

3 left

💡 Hint

Common Mistakes

Using digitalRead() instead of analogRead().

analogRead() is the function used to read the analog value from an ADC pin.

3fill in blank

hard

Fix the error in the code to convert the ADC value to voltage.

Embedded C

float voltage = sensor_value [1] 1023.0 * 5.0;

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A/

B*

C+

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using multiplication instead of division for scaling.

To convert ADC value to voltage, divide by 1023.0 then multiply by reference voltage 5.0.

4fill in blank

hard

Fill both blanks to create a dictionary of ADC values above threshold.

Embedded C

adc_values = {pin: value [1] value for pin, value in readings.items() if value [2] 500}

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A*

B>

C<

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using '*' instead of '+' for addition.

Using '<' instead of '>' for filtering.

The dictionary comprehension adds value to itself and filters values greater than 500.

5fill in blank

hard

Fill all three blanks to calculate average voltage from ADC readings.

Embedded C

average_voltage = sum([1]) [2] len(adc_readings) [3] 5.0 / 1023.0

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Aadc_readings

B/

C*

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-' instead of '*' for voltage scaling.

Dividing by voltage instead of multiplying.

Sum the ADC readings, divide by count to get average ADC value, then multiply by 5.0/1023.0 to get voltage.