From 9ccd84e6df9624798e00614ecb3e58ea7936d519 Mon Sep 17 00:00:00 2001
From: Alex <alex@tesserakt.pro>
Date: Sun, 5 Jul 2026 10:08:07 +0200
Subject: [PATCH] add instructions

---
 pi-instructions.md | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 pi-instructions.md

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+**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)**
+
+```bash
+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**
+
+```bash
+python3 scripts/capture_csv.py
+# logs/dryer_YYYYMMDD_HHMMSS.csv
+```
+
+**Always-on logging**
+
+```bash
+# 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.
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