ckochandClaude Opus 5.5
f9b4c08d60
The KiCad working copy and the Pi image work dir moved out of ~/kicad and ~/Documents into ~/Documents/projects/sandTable-local. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
45 lines
3.3 KiB
Markdown
45 lines
3.3 KiB
Markdown
# Gyre on a Raspberry Pi Zero 2 W
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A Raspberry Pi Zero 2 W inside the table runs the Gyre software by itself, so you don't need a computer. Open **http://gyre.local** on any phone or computer on your Wi-Fi.
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## What you need
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- A Raspberry Pi Zero 2 W and a microSD card (8 GB or more).
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- **Power:** a 12 V to 5 V (3 A) step-down converter with a micro-USB plug. Its input goes to the 12 V terminal on the CNC shield, beside the supply wires; the plug goes into the Pi's **PWR** port. The table keeps one power plug.
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- **To the Uno:** a micro-USB (male) to USB-B (male) cable, or a micro-USB OTG adapter plus the Uno's usual cable. It goes in the Pi's **USB** port, not PWR. It also powers the Uno.
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- **Wi-Fi:** a 2.4 GHz network. The Pi Zero 2 W has no 5 GHz radio.
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## Build the card image
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```
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pi/build-image.sh # work dir ~/Documents/projects/sandTable-local/gyre-pi (or give another one)
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```
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1. **First run:** it copies `settings.example.env` to `~/Documents/projects/sandTable-local/gyre-pi/settings.env` and stops. Fill in your Wi-Fi name, password and country.
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2. **Run it again.** In about a minute it writes `~/Documents/projects/sandTable-local/gyre-pi/out/gyre-pi.img.xz`.
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- **What it does:** it downloads Raspberry Pi OS Lite (2026-10-06, 64-bit) and 12 small packages (pyserial and Pillow), all checksum-checked. Then it puts the Gyre software, the packages and the first-boot settings into the image.
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- **No root needed.**
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- **Login details:** a password for the `gyre` user and an SSH key (`~/.ssh/gyre_pi`) are made for you. Both are written to `~/Documents/projects/sandTable-local/gyre-pi/CREDENTIALS.txt`.
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- **Kept out of the repository:** your Wi-Fi password and the credentials.
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## Write and start it
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1. **Write the card:** in Raspberry Pi Imager, choose **Raspberry Pi Zero 2 W**, then **Choose OS → Use custom** and pick `gyre-pi.img.xz`. When it offers OS customisation, answer **No**; everything is already set.
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2. **Start it:** put the card in the Pi and power the table. The first start takes a few minutes. The Pi:
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- joins your Wi-Fi as `gyre`;
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- creates the `gyre` user;
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- installs the packages from the card;
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- starts the Gyre service, which restarts itself if it ever stops.
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3. **Open the page:** go to **http://gyre.local**. If your device doesn't support `.local` names, use the Pi's address from your router.
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## On the page
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- **Power off and Restart:** links at the bottom, shown only on the Pi. Use Power off before unplugging the table. Pulling the plug on a running Pi can corrupt its card. Power off stops any design and switches the motors off first.
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- **Everything else** works as on a computer. See `../software/README.md`.
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## Maintenance
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- **Log in:** `ssh -i ~/.ssh/gyre_pi gyre@gyre.local` (key only). The password in `CREDENTIALS.txt` is for the console and `sudo`.
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- **Service commands:**
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- `systemctl status gyre`
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- `journalctl -u gyre -f`
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- `sudo systemctl restart gyre`
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- **Files:** the software is in `/opt/gyre/software`; your uploads go to `/opt/gyre/software/patterns/uploads`.
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- **Settings:**
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- `config.txt` puts the Pi Zero 2 W's micro-USB data port in USB host mode. So any micro-USB to USB-B cable works, not only "OTG" ones.
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- The service runs as `gyre` (in the `dialout` group, for the Uno's port). It's allowed onto port 80, and allowed `sudo` only for power off and restart.
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