Question 1

Commands

Accepted Answer

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

Question 2

How do I get an on-screen keyboard?

Accepted Answer

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

Question 3

How to change the display to portrait for Touch monitor

Accepted Answer

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

Question 4

How to install 3rd party modules in Magic Mirror?

Accepted Answer

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 controlsconfig: {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.

Question 5

How to upgrade node js in raspberry pi?

Accepted Answer

$ 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

Question 6

How to install Respeaker in raspberry pi?

Accepted Answer

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/

Question 7

How to use a standard USB webcam

Accepted Answer

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/

Question 8

How to video stream using Raspberry pi camera

Accepted Answer

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

Question 9

How to install Python 3.7 on Raspberry Pi?

Accepted Answer

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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