Knowledge Base

Raspberry Pi

How do I get an on-screen keyboard?


Florence Virtual Keyboard Install with: sudo apt-get install florence




Commands


Stop pm2 command for Magic Mirror pm2 stop mm pm2 stop MagicMirror ---------------------------------------------------------------------------- Edit the config file sudo nano /boot/config.txt ---------------------------------------------------------------------------- Find the screen resolution of your monitor connected with raspberry pi fbset -s ------------------------------------------------------------------------------ How to remove a module of MagicMirror cd ~/MagicMirror rm -rf modules/module_to_delete ------------------------------------------------------------------------------ How to change the hostname of raspberrypi? 1. Update the hostname in this file. Then save the file, and exit the text editor. sudo nano /etc/hostname 2. Open the /etc/hosts file with your favorite text editor. For example: sudo nano /etc/hosts Change the first line and replace your old hostname with the new one. Save the file and exit the editor. 3. Reboot Raspberrypi sudo reboot




How to change the display to portrait for Touch monitor


In config.txt file sudo nano /boot/config.txt Add display_rotate=3 In 10-evdev.conf file, make the following changes cd /usr/share/X11/xorg.conf.d sudo nano 10-evdev.conf Then, go to the following section Section "InputClass" Identifier "evdev touchscreen catchall" MatchIsTouchscreen "on" MatchDevicePath "/dev/input/event*" Driver "evdev" EndSection And add Option "TransformationMatrix" "0 -1 1 1 0 0 0 0 1" Useful links : https://www.raspberrypi.org/forums/viewtopic.php?p=425962#p425962 https://github.com/swkim01/waveshare-dtoverlays https://unix.stackexchange.com/questions/42039/configure-touchscreen-on-debian https://askubuntu.com/questions/890629/my-touchpad-works-like-a-touchscreen




How to install 3rd party modules in Magic Mirror?


1. Go to the modules sub folder in the installed Magic Mirror folder. cd MagicMirror/modules 2. Clone the git folder of the 3rd party module. For example, sudo git clone https://github.com/shbatm/MMM-Carousel 3. Install dependencies (If any) To install the dependencies, you need to go to the respective module that you installed. For example, cd MagicMirror/modules/MMM-Carousel and then install all the dependencies as mentioned in the module page. 4. Final step - Edit the magic mirror config.js file and add the entry as mentioned in the respective module page. For example, {
module: 'MMM-Carousel',
position: 'bottom_bar', // Required only for navigation controls
config: {
transitionInterval: 10000,
ignoreModules: ['clock', 'alert'],
mode: 'slides',
showPageIndicators: true,
showPageControls: true,
slides: {
main: ['calendar', 'compliments', 'currentweather'],
"Slide 2": ['weatherforecast', 'MMM-Trello', 'planetrise', 'newsfeed'],
"Slide 3": ['MMM-fitbit']
},
keyBindings: {
enabled: true,
map: {
NextSlide: "ArrowRight",
PrevSlide: "ArrowLeft",
Slide0: "Home"
},
mode: "DEFAULT"
}
}
}
NOTE: Please take care of comma (,) after the curly brackets.




How to upgrade node js in raspberry pi?


$ node -v v10.12.0 $ curl -sL https://deb.nodesource.com/setup_12.x | sudo -E bash - $ sudo apt install nodejs $ node -v v12.10.0




How to install Respeaker in raspberry pi?


Step 1. Please Make sure running the lastest Raspbian Operating System(debian 9) on Pi. (updated at 2018.11.13) Step 2. Get the seeed voice card source code. sudo apt-get update sudo apt-get upgrade git clone https://github.com/respeaker/seeed-voicecard.git cd seeed-voicecard sudo ./install.sh reboot Step 3. Then select the headphone jack on Raspberry Pi for audio output: sudo raspi-config # Select 7 Advanced Options # Select A4 Audio # Select 1 Force 3.5mm ('headphone') jack # Select Finish Step 4. Check that the sound card name looks like this: pi@raspberrypi:~ $ arecord -L If we want to change the alsa settings, we can use sudo alsactl --file=ac108_asound.state store to save it. And when we need to use the settings again, copy it to: sudo cp ~/seeed-voicecard/ac108_asound.state /var/lib/alsa/asound.state Step 5. Open Audacity and select AC108 & 4 channels as input and bcm2835 alsa: - (hw:0:0)as output to test: $ sudo apt update $ sudo apt install audacity $ audacity // run audacity Step 6. Or we could record with arecord and play with aplay: // only support 4 channels arecord -Dac108 -f S32_LE -r 16000 -c 4 hello.wav // make sure default device // Audio will come out via audio jack of Raspberry Pi aplay hello.wav ------------------------------------------------------------------------------------ References http://wiki.seeedstudio.com/ReSpeaker_4_Mic_Array_for_Raspberry_Pi/




How to use a standard USB webcam


Install fswebcam First, install the fswebcam package: sudo apt-get install fswebcam Add your user to video group If you are not using the default pi user account, you need to add your username to the video group, otherwise you will see 'permission denied' errors. sudo usermod -a -G video To check that the user has been added to the group correctly, use the groupscommand. Basic usage Enter the command fswebcam followed by a filename and a picture will be taken using the webcam, and saved to the filename specified: fswebcam image.jpg Specify resolution The webcam used in this example has a resolution of 1280 x 720 so to specify the resolution I want the image to be taken at, use the -r flag: fswebcam -r 1280x720 image2.jpg Specify no banner Now add the --no-banner flag: fswebcam -r 1280x720 --no-banner image3.jpg Bash script You can write a Bash script which takes a picture with the webcam. The script below saves the images in the /home/pi/webcam directory, so create the webcam subdirectory first with: mkdir webcam To create a script, open up your editor of choice and write the following example code: #!/bin/bash DATE=$(date +"%Y-%m-%d_%H%M") fswebcam -r 1280x720 --no-banner /home/pi/webcam/$DATE.jpg This script will take a picture and name the file with a timestamp. Say we saved it as webcam.sh, we would first make the file executable: chmod +x webcam.sh Then run with: ./webcam.sh ---------------------------------------------------------------------------------- References https://www.raspberrypi.org/documentation/usage/webcams/




How to video stream using Raspberry pi camera


References https://randomnerdtutorials.com/video-streaming-with-raspberry-pi-camera/




How to install Python 3.7 on Raspberry Pi?


https://www.ramoonus.nl/2018/06/30/installing-python-3-7-on-raspberry-pi/ https://samx18.io/blog/2018/09/05/python3_raspberrypi.html





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