Data quality flags in SCADA systems - Mini Project: Build & Apply

Data Quality Flags in SCADA Systems

📖 Scenario: You work with a SCADA system that collects sensor readings from a factory. Each reading has a value and a quality flag that tells if the data is good or has issues.Quality flags help operators know if sensor data is reliable or needs attention.

🎯 Goal: Create a program that stores sensor readings with their quality flags, sets a threshold for acceptable quality, filters out bad data, and shows only good readings.

📋 What You'll Learn

Create a dictionary called sensor_readings with exact keys and values

Add a variable called quality_threshold with the exact value 2

Use a dictionary comprehension to create good_readings with readings having quality flags less than quality_threshold

Print the good_readings dictionary

💡 Why This Matters

🌍 Real World

SCADA systems monitor industrial sensors and use quality flags to ensure operators trust the data before making decisions.

💼 Career

Understanding how to handle data quality flags is important for roles in industrial automation, process control, and data engineering.

1

Create sensor readings dictionary

Create a dictionary called sensor_readings with these exact entries: 'temp_sensor': (22.5, 1), 'pressure_sensor': (101.3, 3), 'humidity_sensor': (45.0, 2), 'flow_sensor': (5.5, 1)

SCADA systems

# Create the sensor_readings dictionary with exact entries
# Your code here

Need a hint?

Use curly braces {} to create a dictionary. Each key is a sensor name string, and each value is a tuple with a float and an integer.

2

Set quality threshold

Add a variable called quality_threshold and set it to the integer 2

SCADA systems

sensor_readings = {
    'temp_sensor': (22.5, 1),
    'pressure_sensor': (101.3, 3),
    'humidity_sensor': (45.0, 2),
    'flow_sensor': (5.5, 1)
}
# Set quality_threshold to 2
# Your code here

Need a hint?

Just assign the number 2 to the variable quality_threshold.

3

Filter good quality readings

Use a dictionary comprehension to create a dictionary called good_readings that includes only entries from sensor_readings where the quality flag (second item in the tuple) is less than quality_threshold

SCADA systems

sensor_readings = {
    'temp_sensor': (22.5, 1),
    'pressure_sensor': (101.3, 3),
    'humidity_sensor': (45.0, 2),
    'flow_sensor': (5.5, 1)
}
quality_threshold = 2
# Create good_readings dictionary with comprehension
# Your code here

Need a hint?

Use {key: value for key, value in dict.items() if condition} syntax. Check if the second item in the tuple is less than quality_threshold.

4

Display good readings

Write a print statement to display the good_readings dictionary

SCADA systems

sensor_readings = {
    'temp_sensor': (22.5, 1),
    'pressure_sensor': (101.3, 3),
    'humidity_sensor': (45.0, 2),
    'flow_sensor': (5.5, 1)
}
quality_threshold = 2
good_readings = {sensor: data for sensor, data in sensor_readings.items() if data[1] < quality_threshold}
# Print good_readings
# Your code here

Need a hint?

Use print(good_readings) to show the filtered dictionary.