pi/test/version/ is from https://www.w3schools.com/nodejs/nodejs_raspberrypi_rgb_led_websocket.asp
Webcam is from https://kaanlabs.com/rtmp-hls-webcam-live-streaming-with-hardware-accelerated-h264-on-a-raspberry-pi/ for webcam live
https://askubuntu.com/a/508337/1151021
Download Ubuntu Server from page https://ubuntu.com/download/raspberry-pi
Download raspberry-pi-imager from page https://www.raspberrypi.com/software/, use Raspberry Pi Imager to install Raspberry Pi OS(the last Ubuntu o). The Ubuntu image for Raspberry Pi uses cloud-init to configure the system at boot time. This means that in your SD card system-boot volume, there should be a YAML file, called network-config. Open this file in VS Code (or your favourite text editor).
Edit it so that it looks like the following. The indentation is important, and it's the 'wifis' section that you're editing to match your wifi configuration. Replace 'YOUR-WIFI-SSD' with your WiFi's name, and 'YOUR-WIFI-PASSWORD' with your WiFi password. edit network-config
version: 2
ethernets:
eth0:
dhcp4: true
optional: true
wifis:
wlan0:
dhcp4: true
optional: true
access-points:
"YOUR-WIFI-SSID":
password: "YOUR-WIFI-PASSWORD"First logging in with keyboard and monitor, with username ubuntu and password ubuntu it will change the password first time. reload ssh service
sudo systemctl enable ssh.service
sudo systemctl start ssh.servicethen you can connect raspberry pi with ssh. or repower the raspberry pi, it will connect auto.
Create ssh by ssh-keygen and add it.
cd ~/.ssh
eval "$(ssh-agent -s)"
ssh-keygen -t rsa
ssh-add ~/.ssh/id_rsaCopy the ssh id to default host with default user.
cd ~/.ssh
ssh-copy-id -i ~/.ssh/id_rsa.pub default_user@default_hostCreate a ~/.ssh/config file and insert the line:
UserKnownHostsFile ~/.ssh/known_hostsChange hosts file
sudo nano /etc/hosts127.0.0.1 localhost
127.0.0.1 ubuntuThen
sudo rm /etc/resolv.conf
sudo ln -s /var/run/systemd/resolve/resolv.conf /etc/resolv.conf
sudo systemctl restart systemd-resolved.serviceInstall node.js and npm:
sudo apt update
sudo apt upgrade
curl -fsSL https://deb.nodesource.com/setup_17.x | sudo -E bash -
sudo apt-get install -y nodejs
sudo apt-get install -y npmhttps://www.mongodb.com/developer/how-to/mongodb-on-raspberry-pi/
install gcc library
apt-get install build-essentialI downloaded and compiled ffmpeg from the source. Download ffmpeg_4.2.4.orig.tar.xz https://launchpad.net/ubuntu/+source/ffmpeg (version 20.04.3 LTS The Focal Fossa) Unpack it.
tar -xvf ffmpeg_4.2.4.orig.tar.xz
cd ffmpeg-4.2.4
./configure
make
sudo make installmkdir github
cd github
git clone https://github.com/dty717/ocr.gitcd ocr/pi
sudo npm install
touch startOCR.sh
chmod +x startOCR.sh
cd /lib/systemd/system
sudo touch ocr.service
sudo nano ocr.servicesudo systemctl daemon-reload
sudo systemctl enable ocr.service
sudo systemctl start ocr.servicehttps://roboticsbackend.com/make-a-raspberry-pi-3-program-start-on-boot/
sudo nano /etc/netplan/50-cloud-init.yaml
# This file is generated from information provided by the datasource.
# Changes to it will not persist across an instance reboot. To disable
# cloud-init's network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the
# following: network: {config: disabled}
network:
version: 2
renderer: networkd
wifis:
wlan0:
access-points:
DESKTOP-18:
password: '12345678'
dhcp4: true
optional: true
wlan0:
access-points:
"other-network-ssid":
password: 'other-network-password'
dhcp4: true
ethernets:
eth0:
addresses:
- 192.168.0.2/24
sudo netplan generate
sudo netplan try
sudo netplan apply #be careful with the above commond no error and can be runned!!!list network
sudo wpa_cli -i wlan0 list_networksselect network
sudo wpa_cli -i wlan0 select_network network_idsudo apt-get install -y g++ # or clang++ (presumably)
sudo apt-get install -y autoconf
sudo apt-get install -y automake
sudo apt-get install -y libtool
sudo apt-get install -y pkg-config
sudo apt-get install -y libpng-dev
sudo apt-get install -y libjpeg8-dev
sudo apt-get install -y libtiff5-dev
sudo apt-get install -y zlib1g-dev
sudo apt-get install -y libicu-dev
sudo apt-get install -y libpango1.0-dev
sudo apt-get install -y libcairo2-dev
sudo apt-get install -y libleptonica-dev
cd ~/github
git clone https://github.com/tesseract-ocr/tesseract.git
cd tesseract
./autogen.sh
./configure
make
sudo make install
sudo ldconfig
make training
sudo make training-installadd TESSDATA_PREFIX
cd /home/ubuntu/github/
mkdir tessdata
wget https://github.com/tesseract-ocr/tessdata_best/raw/main/eng.traineddata
wget https://github.com/tesseract-ocr/tessdata_best/raw/main/chi_sim_vert.traineddata
wget https://github.com/tesseract-ocr/tessdata_best/raw/main/chi_sim.traineddata
sudo nano ~/.bashrcadd in the bottom
export TESSDATA_PREFIX=/home/ubuntu/github/tessdatasource ~/.bashtest
cd ~/github/ocr/pi
tesseract uploadImage/current_frame.jpg testCurrent -l eng+chi_simnpm install -g node-pre-gyp
https://ubuntu.com/download/raspberry-pi
https://forums.raspberrypi.com/viewtopic.php?t=125345#p840309
https://roboticsbackend.com/install-ubuntu-mate-18-04-on-raspberry-pi-3-b/
https://www.mongodb.com/developer/how-to/mongodb-on-raspberry-pi/
https://forums.raspberrypi.com/viewtopic.php?t=125367#p1176686
https://roboticsbackend.com/make-a-raspberry-pi-3-program-start-on-boot/
https://github.com/nodesource/distributions
https://stackoverflow.com/a/61444221/7734634
https://askubuntu.com/a/1343976
https://unix.stackexchange.com/a/47092/412884
https://tesseract-ocr.github.io/tessdoc/Compiling.html
https://tesseract-ocr.github.io/tessdoc/ImproveQuality.html
https://stackoverflow.com/a/15578473/7734634
https://www.rickmakes.com/cheap-hdmi-usb-capture-card-on-a-raspberry-pi-4/