Day 12 – BACnet RPM CSV Logging with Daily Rotation | Production Raspberry Pi Scraper

Welcome to Day 13 of the BACnet with Python for Building Automation Engineers course.

Today is theory plus real-world implementation.

Because reading BACnet data is one thing.

Storing it properly for months in the field is another.

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First, we continued our theory discussion on looping over dictionaries.

Because once you start logging structured RPM data…

you are living inside nested dictionaries.

We talked about:

• iterating over items()
• mapping headers to object identifiers
• building rows dynamically
• merging device result dictionaries
• safe lookups with get()
• designing clean data structures for scalability

This is the difference between:

printing values

and

engineering a data pipeline.

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Then we vibe coded something very real.

We added daily CSV rotation to our BACnet RPM scraper running on Raspberry Pi.

Now the app:

• runs continuously
• polls both VAV and AHU
• logs one row per cycle
• writes to data_logs/bacnet_rpm_YYYY-MM-DD.csv
• auto-rotates at midnight
• creates headers if missing
• appends clean Excel-friendly rows

This is not a demo script anymore.

This is a field-ready data logger.

If you deploy a Raspberry Pi in a building…

it won’t create one massive file forever.

It rotates daily.

Clean.

Predictable.

Maintainable.

We also structured the code to:

• separate CSV helpers
• separate header mapping
• safely extract values
• merge device results
• handle RPM failures gracefully

This is applied engineering.

Understanding dictionaries.

Understanding loops.

Understanding long-term behavior.

And using ChatGPT strategically to refine structure without losing control of the logic.

Learn the fundamentals.

Then build real tools.

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Full course + repo:
https://github.com/bbartling/py-bacnet-stacks-playground

If you’re an HVAC tech or controls engineer who wants to deploy real BACnet data collectors in the field and not just run one-off scripts on your laptop, this is the mindset shift.

Checkpoint 2 is officially production-grade.

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