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Learn how to effectively log rainfall using Python on a Raspberry Pi Zero weather station with a tipping bucket rain gauge. This guide walks you through the solution step by step.
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This video is based on the question https://stackoverflow.com/q/64316754/ asked by the user 'DanF' ( https://stackoverflow.com/u/3281881/ ) and on the answer https://stackoverflow.com/a/64316839/ provided by the user 'FrozenAra' ( https://stackoverflow.com/u/12971025/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Log Rainfall with Python on Your Raspberry Pi Weather Station

Setting up a weather station can be an exciting project, especially when you are using a Raspberry Pi to collect various environmental data. If you're looking to add rainfall logging capability with a tipping bucket rain gauge, you might hit a roadblock in your Python coding journey. This post will guide you through troubleshooting and implementing a solid solution for logging rainfall with Python.

Understanding the Problem

You have a Raspberry Pi Zero that is already logging temperature, humidity, and pressure. Recently, you added a tipping bucket rain gauge which consists of two wires connected to the GPIO pins on the Pi. When the bucket tips, it completes the circuit, acting like a momentary button press.

The primary goal is to count these tips every hour, log the data, and send it to an external service like the Windy API. However, you may find yourself wondering how to achieve this in Python without running into obstacles.

The Solution

Key Considerations

Before jumping into the code, let's outline the steps you need to follow:

Setting Up the GPIO Button: Use the GPIO library to detect button presses (bucket tips).

Counting Tips: Maintain a counter to track the number of tips over a specified interval.

Resetting the Counter: Reset the counter after logging the data.

Logging Data: Save the rainfall data either in a log file or send it to an API.

Code Implementation

Setting Up Your Environment

Ensure you have the necessary packages installed on your Raspberry Pi. You typically need the following:

[[See Video to Reveal this Text or Code Snippet]]

Sample Code

Here's an enhanced version of the Python script for counting rainfall using a tipping bucket gauge:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code

Rain Sensor Setup: The rain sensor is configured on GPIO pin 27. Use the Button class from the gpiozero library to capture tips.

Counting Tips: The bucket_tipped function increments the count each time the bucket tips.

Resetting and Logging: The log_rainfall function calculates the total rainfall and then resets the counter. You can extend this to log the data to a file or API.

The Main Loop: The timed_loop function checks every hour if any tips have occurred and logs the rainfall.

Final Thoughts

Through this step-by-step guide, you should now have a clear roadmap for logging rainfall with Python using your Raspberry Pi. Don’t hesitate to adjust the code and logic to suit your unique setup. Happy coding and enjoy your new weather station!