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