Raspberry-Pi-4 Wiki¶

Getting Started¶

Hardware Required:

You can flash the image using either:

unzip RaspberryPi4-shunya-xxxx-image-0.1.zip
cd RaspberryPi4-shunya-xxxx-image-0.1

Note

Please replace xxxx with desktop or console dependending on the image you downloaded

If you are using a built in Memory card reader then use the command below:

sudo dd if=shunya-xxxx-image-raspberrypi4.img of=/dev/mmcblk0 status=progress

OR

If you are using a USB SD-Card adapter use the command below:

sudo dd if=shunya-xxxx-image-raspberrypi4.img of=/dev/sdx status=progress

Note

Please replace x in /dev/sdx with your device(eg /dev/sdb)

Step 1:Right click on the zip file downloaded and select Extract here
Step 2:Once the image is unzipped double click on the unzipped image folder in which you will find the image and release info
Step 3:Right click on the image
Step 4:Select Open with -> Disk image writer
Step 5:Choose Destination as SD Card Reader
Step 6:Enter your password

Network Devices available:

To record a video in the avi format use the following command

gst-launch-1.0 v4l2src ! avimux ! filesink location=filename.avi -e

To record a video in the mkv format use the following command

gst-launch-1.0 -e v4l2src ! videoconvert ! matroskamux ! filesink location=filename.mkv

Note

Device number might change so be careful.

To install ffmpeg use the following command:

sudo apt install ffmpeg

To check the index of the USB use v4l-utils.You can install it and get the index using the commands below:

sudo apt install v4l-utils
v4l2-ctl --list-devices

To record a video using ffmpeg the following command can be used:

ffmpeg -i /dev/video0 filename.avi

OR

ffmpeg -f v4l2 -video_size 640x480 -i /dev/video0 -c:v libx264 filename.mp4

Sound recording and playback is tested using a USB Mic and a Speaker connected to USB Sound Adapter.

Note

Device and card numbers might change so be careful.

To list the recording devices you can use this command:

arecord -l

To record a wav file you can use the following command:

arecord -vv -Dplughw:1,0 -f dat filename.wav

To list the playback devices use this command:

aplay -l

To playback a wav file from the Speaker connect to USB Sound Adapter use the following command:

aplay -vv --device=hw:0,0 filename.wav

sudo opkg install python3-opencv

 sudo opkg install git
 git clone https://github.com/shunyaos/object-recognition-dnn.git
 cd object-recognition-dnn
 python3 detect.py

Shunya O/s Version: 0.1-Beta

Kernel Version: 4.19.50

Bootloader: U-BOOT

Desktop Environment (if applicable): XFCE