Hendrik Langer
55d0b67c39
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6 years ago | |
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cad | 6 years ago | |
doc | 6 years ago | |
raspberry-environment | 6 years ago | |
windows-snapshot-tool | 6 years ago | |
README.md | 6 years ago |
README.md
RasPi Freezer
Usage Instructions
- Plug HDMI into Beamer
- Plug USB into Computer
- booting the Raspberry takes approximately 25 seconds. the green led will light up when ready
- start freeze.exe from the (newly attached) USB-Drive
- press button on device or ALT+X or Alt+PRINTSCREEN to take a screenshot
- simply unplug after use
Other features
- you can call freeze.exe with the cmdline argument "single" to just do one screenshot, save it and exit
Initial setup
Parts
- Mini-HDMI <-> HDMI Adapter
- Mini-USB <-> USB A Cable
- Micro-SD-Card >= 2GB
- Raspberry Pi Zero or Zero W or Model A (Model B/2B/3 not supported!)
Hardware
LED LED SW
______||_______|||____
| :::::::::::::::::::: |
| |
|_HDMI________USB__PWR_|
| | nc
v v
Beamer PC
Build windows snapshot-tool
cd windows-snapshot-tool mkdir build && cd build cmake -DCMAKE_TOOLCHAIN_FILE=../Toolchain-cross-mingw32-linux.cmake ../ make
prepare raspberry pi
install raspbian lite
sudo raspi-config
- ??
- ??
sudo su - apt update apt dist-upgrade apt install python3-pyinotify python3-rpi.gpio apt clean
echo "dtoverlay=dwc2" >> /boot/config.txt
echo "dtoverlay=gpio-poweroff,gpiopin=5,active_low" >> /boot/config.txt
sed -i /boot/config.txt -e "s/^hdmi_force_hotplug=1$/hdmi_force_hotplug=1$/"
echo "libcomposite" >> /etc/modules
apt purge plymouth systemctl disable getty@tty1
add/change in /boot/cmdline.txt: console=tty3 consoleblank=0 loglevel=3 vt.global_cursor_default=0 (logo.nologo to disable the raspberry)
copy everything to /opt/freezer/ chmod a+x /opt/freezer/display.py add to /etc/rc.local: cd /tmp && nohup python3 /opt/freezer/display.py 2>&1 &
read-only root
wget https://raw.githubusercontent.com/adafruit/Raspberry-Pi-Installer-Scripts/master/read-only-fs.sh
sudo bash read-only-fs.sh
- continue: y
- jumper: n
- gpio-halt: n
- watchdog: n
- continue: y
this is how to remount read-write later to make changes to the fs
mount -o remount,rw / mount -o remount,rw /boot
ToDo
- korrekte auflösung bei desktop-scaling
- zu viel overscan
- hdmi korrekt konfigurieren wenn nach boot erst angeschlossen
- zeit knopfdruck bis anzeige soweit möglich optimieren