arduino-filament-dryer/pi-instructions.md

Structure & Task

• Auto-detects the port (/dev/serial/by-id/..., then ttyACM0 / ttyUSB0)
• Sends log on on connect (no manual step)
• Adds wall_time (UTC ISO timestamp) as the first column — better than ms alone for long runs
• scripts/requirements.txt — pip install -r scripts/requirements.txt
• scripts/dryer-logger.service — optional systemd unit for logging at boot

On the Pi (one-time setup)

git clone <your-repo> ~/voron-filament-dryer   # or copy the repo over
cd ~/voron-filament-dryer
pip install -r scripts/requirements.txt
sudo usermod -aG dialout $USER   # then log out/in

Manual run

python3 scripts/capture_csv.py
# logs/dryer_YYYYMMDD_HHMMSS.csv

Always-on logging

# Edit User/WorkingDirectory paths in scripts/dryer-logger.service if needed
sudo cp scripts/dryer-logger.service /etc/systemd/system/
sudo systemctl enable --now dryer-logger.service

No firmware changes needed — the Arduino still streams csv,... every 2 s when logging is on. If the Pi and your PC both try to use the same USB cable, only one can hold the serial port at a time.