Soil moisture sensor in Arduino - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to read the soil moisture sensor value.

Arduino

int sensorValue = analogRead([1]);

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AA0

B13

CGND

D5V

Attempts:

3 left

💡 Hint

Common Mistakes

Using a digital pin number instead of an analog pin.

Trying to read from power or ground pins.

The soil moisture sensor is connected to analog pin A0, so we use analogRead(A0) to get its value.

2fill in blank

medium

Complete the code to print the sensor value to the serial monitor.

Arduino

Serial.println([1]);

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Amoisture

BsensorValue

Csensor

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that was not declared.

Printing a string instead of the variable.

The variable holding the sensor reading is sensorValue, so we print that.

3fill in blank

hard

Fix the error in the code to initialize serial communication at 9600 baud.

Arduino

Serial.begin([1]);

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A9600

B115200

C4800

D19200

Attempts:

3 left

💡 Hint

Common Mistakes

Using a baud rate that does not match the serial monitor setting.

Using a very high baud rate without hardware support.

The standard baud rate for many Arduino serial communications is 9600.

4fill in blank

hard

Fill both blanks to create a condition that checks if the soil is dry (sensor value less than 300).

Arduino

if ([1] [2] 300) {
  Serial.println("Soil is dry");
}

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AsensorValue

B<

C>

DmoistureLevel

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong variable name.

Using the greater than operator instead of less than.

We check if sensorValue is less than 300 to detect dry soil.

5fill in blank

hard

Fill all three blanks to map the sensor value (0-1023) to a percentage (0-100) and print it.

Arduino

int moisturePercent = map([1], 0, [2], 0, [3]);
Serial.print("Moisture: ");
Serial.print(moisturePercent);
Serial.println("%");

Drag options to blanks, or click blank then click option'

AsensorValue

B1023

C100

DmoistureValue

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect variable names.

Mixing up the input and output ranges.

The map function converts the sensor reading from 0-1023 to 0-100 percent.