ESP 32 Project

Temperature Conversion Function in MicroPython for ESP32 and ESP8266

In this project, you will write a function to convert Temperature Conversion Function in MicroPython for ESP32 and ESP8266. This project covers the concept of defining a function with arguments and return values, making it a great example of how to handle input parameters and produce a result. Converting temperature between Celsius and Fahrenheit is a common calculation, and writing a function for this allows you to reuse the logic wherever needed in your code.

Data Types and Variable Table for Temperature Conversion Function:

Data Type Variable Name Description Example Value
Float temp_celsius The input temperature in Celsius 25.0
Float temp_fahrenheit The output temperature in Fahrenheit 77.0

The float data type is used to store both the input Celsius temperature and the output Fahrenheit temperature.

Syntax Table for Temperature Conversion Function in MicroPython:

Operation Syntax Example
Function definition def function_name(parameters): def celsius_to_fahrenheit(celsius):
Temperature conversion (celsius * 9/5) + 32 fahrenheit = (celsius * 9/5) + 32
Return value from function return value return fahrenheit

This project demonstrates how to define a function with an argument (Celsius temperature) and return the converted Fahrenheit temperature.

Required Components:

  • ESP32 or ESP8266
  • Computer with Thonny (or another MicroPython IDE)

Since this project focuses on temperature conversion, no additional hardware components are required.

Circuit Diagram:

(No circuit diagram is required as this project focuses on programming.)

Circuit Connection Table:

(No circuit connections are needed for this project.)

Warnings:

  • Ensure that the input to the function is in Celsius for the correct conversion to Fahrenheit.
  • Avoid passing non-numeric data types to the function, as this will result in an error.

Circuit Analysis:

This project focuses on the conversion of temperature between Celsius and Fahrenheit using a simple mathematical formula. No hardware components are needed, as the function is purely computational.

Installing MicroPython and Required Libraries:

Install MicroPython on ESP32/ESP8266: Ensure that you have MicroPython installed on your ESP32 or ESP8266. You can flash the MicroPython firmware using esptool or Thonny:

esptool.py –chip esp32 erase_flash

esptool.py –chip esp32 write_flash -z 0x1000 esp32-20210902-v1.17.bin

  1. No Additional Libraries Needed: The built-in functionality of MicroPython is sufficient to handle this temperature conversion task.

Writing the MicroPython Code for Temperature Conversion Function:

Here’s the code that defines a function to convert Celsius to Fahrenheit:

# Function to convert Celsius to Fahrenheit

def celsius_to_fahrenheit(celsius):

    # Conversion formula

    fahrenheit = (celsius * 9/5) + 32

    return fahrenheit

 

# Test the function by converting 25 degrees Celsius to Fahrenheit

temp_celsius = 25.0

temp_fahrenheit = celsius_to_fahrenheit(temp_celsius)

 

print(f”{temp_celsius}°C is {temp_fahrenheit}°F”)

 

Explanation of the Code:

  1. The function celsius_to_fahrenheit(celsius) is defined to take one input parameter, celsius, which represents the temperature in Celsius.
  2. Inside the function, the conversion formula (celsius * 9/5) + 32 is used to calculate the equivalent temperature in Fahrenheit.
  3. The function returns the Fahrenheit value.
  4. The function is tested by passing 25.0 degrees Celsius, and the result is printed.

Running the Code and Checking the Output:

  1. Upload the code to your ESP32/ESP8266 using Thonny or another MicroPython IDE.

Observe the output on the serial monitor, which will show the converted temperature:
25.0°C is 77.0°F

Expanding the Project:

  • Convert Fahrenheit to Celsius: Write another function to convert from Fahrenheit to Celsius using the formula (fahrenheit – 32) * 5/9.
  • Integrate a Temperature Sensor: Connect a temperature sensor (such as DHT11 or DHT22) to your ESP32/ESP8266, read the Celsius value from the sensor, and use the conversion function to display the temperature in Fahrenheit.
  • Multiple Conversions: Extend the project to handle temperature ranges by converting a list of temperatures from Celsius to Fahrenheit using a loop.

Common Problems and Solutions:

  1. Problem: The function returns an incorrect result.
    • Solution: Double-check the formula to ensure that the calculation (celsius * 9/5) + 32 is correct and that you are passing the correct value to the function.
  2. Problem: The program throws an error when calling the function.
    • Solution: Ensure that the input value passed to the function is a valid float or integer, as non-numeric inputs will cause an error.
  3. Problem: The output is not displaying correctly.
    • Solution: Verify the print statement and ensure that the correct variables are being passed to the print() function.

FAQ:

Q: Can I use a different formula to convert Celsius to Fahrenheit?
A: No, the formula (celsius * 9/5) + 32 is the standard formula for converting Celsius to Fahrenheit. However, you can modify the function to handle other units of measurement.

Q: How can I convert a range of temperatures at once?
A: You can use a for loop to iterate through a list of temperatures and call the conversion function for each value.

Q: Can I modify the function to round the result?
A: Yes, you can use Python’s round() function to round the Fahrenheit result to a specified number of decimal places. For example, fahrenheit = round((celsius * 9/5) + 32, 2) will round to two decimal places.

Conclusion:

In this project, you successfully created a temperature conversion function that converts Celsius to Fahrenheit in MicroPython for ESP32 and ESP8266. This function takes an input parameter, performs the conversion, and returns the result, demonstrating how to work with arguments and return values in MicroPython. This project can be easily expanded to handle more complex temperature calculations or integrated with a temperature sensor for real-time conversions.

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