Okategoriserade

Davinci resolve script for generating videos that can be imported

Leave a comment


#!/bin/bash
DIRPATH=$1
OLDIFS=$IFS
IFS=$'\n'

if [ -z “$DIRPATH” ]
then
exit 1
fi

mkdir -p processed

FILES=$(ls $DIRPATH)

for i in $FILES
do
if [ -d “$FILES” ]
then
continue
fi

NEW_NAME=$(echo $i | sed ‘s/\.[^.]*$/.mov/’)
#NEW
ffmpeg -i “$i” -vcodec dnxhd -profile:v dnxhr_hq -pix_fmt yuv422p -s 1920×1080 -r 24 -acodec copy “processed/$NEW_NAME”
#OLD
#ffmpeg -i “$i” -vcodec dnxhd -acodec pcm_s16le -s 1920×1080 -r 30000/1001 -b:v 36M -pix_fmt yuv422p -f mov “processed/$NEW_NAME”
done

Embedded Systems

Stm32f103 course

Leave a comment

Hello!

Update, the course is completed and can be found on udemy, link is here: STM32 Beginner Course

I’ve seen some interest in my stm32 blinky example tutorial and want to give you guys more content in the fun embedded world, especially for the stm32 microcontroller. I’ve put up a table of contents down below, this is what the course will cover.

What radio would you like to see in this course? Please leave a comment down below or email me. I’m also thinking of creating a hardware starter kit with all the necessary components needed for the project.

Thanks for your time,
Regards,
Johan

Continue reading Stm32f103 course →

Embedded Systems

mMESH – Technical deep dive

Leave a comment

Folder structure for mMesh[1]:

  • src/spi # Serial Peripheral Interface (SPI)
  • src/test # GTest
  • src/test/mesh # GTest
  • src/syscalls # Wrapper for calls like sleep and timers, differs between different platforms.
  • src/netAlgorithm # Implementation for network algorithms for choosing parent, neighbour and routing for packets.
  • src/mesh # Mesh implementation
  • src/network # Network adapter and network drivers
  • src/network/RF24 # RF24 driver ported from https://github.com/nRF24/RF24
  • src/node # Is used for testing, a node simulates a radio with network functionality
  • src/GPIO # General Purpose Input Output (GPIO)
  • src/islands # Is used for testing, simulates physical boundaries, if two nodes reside in one island they are able to speak with each other.

Continue reading mMESH – Technical deep dive →

Embedded Systems

mMesh – Mesh Network

Leave a comment

I have created a mesh network algorithm for embedded systems. This implementation is released be released under MIT License.

Me and a friend have started an Internet Of Things project and we wanted to have a radio module to our microcontroller for communication. The radio module we choose was the NRF24L01+.

One question might arise: Why not use the NRF24Mesh[1] solution that’s already been developed? I’ve looked at the design and noticed that it could be improved which are mentioned in the features, and I also wanted to create it by myself, because I can 🙂

In this post I will discuss about the architectural design of the Mesh Network.

Features of this implementation:
Address range: ~2^18 addresses (262144).
Decentralized network topology: a master is needed, all grouping and addressing will be decentralized, which means that the closest “parent” is responsible to address it’s children’s.
Mesh with multiple routes: All the nodes in the network has always a “default” route to master. Nodes can also pair to other nodes in the network that is physically close. If node A and node B needs to communicate with each other they don’t need to send the packet via the master node, if there is an opportunity to send the packet to a physically near node, and the number of hops is less than via the master, the packet will be sent to that neighbour, which will route it onwards.

Continue reading mMesh – Mesh Network →

Embedded Systems, Okategoriserade

Espressobin – install nginx and php

Leave a comment

Espressobin is my new toy which eventually be my new bridge to the internet while it hosts my connected home. Eventually it will be hosting Home Assistant, OpenVPN and be the WLAN Access Point.

The Espressobin has all the “horse power” i need, it is equipped with 1 gigabyte of ram and a dual core ARM Cortex A53 processor with a clock speed up to 1.2GHz. Which will be plenty enough for my setup. Technical details about the Espressobin is available on their homepage: http://espressobin.net/tech-spec/

Continue reading Espressobin – install nginx and php →

Embedded blog