Real-time sensor dashboard in Raspberry Pi - Mini Project: Build & Apply

Real-time sensor dashboard

📖 Scenario: You are building a simple real-time dashboard on a Raspberry Pi to monitor temperature and humidity sensors in a greenhouse. The dashboard will collect sensor data, filter readings above a certain threshold, and display the results.

🎯 Goal: Create a Python program that stores sensor readings in a dictionary, sets a threshold for temperature, filters the readings above that threshold, and prints the filtered results.

📋 What You'll Learn

Create a dictionary with sensor names as keys and their temperature readings as values.

Create a variable to hold the temperature threshold.

Use a dictionary comprehension to filter sensors with temperature above the threshold.

Print the filtered dictionary showing sensors exceeding the threshold.

💡 Why This Matters

🌍 Real World

Monitoring environmental conditions like temperature and humidity in places such as greenhouses or server rooms helps maintain optimal conditions and prevent damage.

💼 Career

Skills in handling sensor data and filtering it in real-time are useful for IoT developers, embedded systems engineers, and automation specialists.

1

Create sensor data dictionary

Create a dictionary called sensor_readings with these exact entries: 'sensor1': 22.5, 'sensor2': 27.0, 'sensor3': 19.8, 'sensor4': 30.2

Raspberry Pi

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

Need a hint?

Use curly braces {} to create a dictionary with keys and values separated by colons.

2

Set temperature threshold

Create a variable called temp_threshold and set it to 25.0

Raspberry Pi

sensor_readings = {'sensor1': 22.5, 'sensor2': 27.0, 'sensor3': 19.8, 'sensor4': 30.2}
# Create temp_threshold variable and set it to 25.0
# Your code here

Need a hint?

Assign the value 25.0 to the variable temp_threshold.

3

Filter sensors above threshold

Use a dictionary comprehension to create a new dictionary called high_temps that contains only the sensors from sensor_readings with temperature values greater than temp_threshold

Raspberry Pi

sensor_readings = {'sensor1': 22.5, 'sensor2': 27.0, 'sensor3': 19.8, 'sensor4': 30.2}
temp_threshold = 25.0
# Create high_temps dictionary with sensors above temp_threshold
# Your code here

Need a hint?

Use {sensor: temp for sensor, temp in sensor_readings.items() if temp > temp_threshold} to filter the dictionary.

4

Print filtered sensor readings

Write a print statement to display the high_temps dictionary

Raspberry Pi

sensor_readings = {'sensor1': 22.5, 'sensor2': 27.0, 'sensor3': 19.8, 'sensor4': 30.2}
temp_threshold = 25.0
high_temps = {sensor: temp for sensor, temp in sensor_readings.items() if temp > temp_threshold}
# Print the high_temps dictionary
# Your code here

Need a hint?

Use print(high_temps) to show the filtered dictionary.