how-to

Posted on by Jean-Luc Aufranc (CNXSoft) - 14 Comments on Google Releases Guetzli Open Source JPEG Encoder Generating 20 to 3514 Smaller Files Compared to Libjpeg

Google Releases Guetzli Open Source JPEG Encoder Generating 20 to 35% Smaller Files Compared to Libjpeg

Google has been working one several front to make data and images smaller, hence faster to load from the Internet, with project such as Zopfli algorithm producing smalled PNG & gzip files, or WebP image compression algorithm that provides better lossless compression compare to PNG, and better lossy compression compared to JPEG, but requires updated support from clients such as web browsers. Google has now released Guetzli algorithm that improve on the latter, as it can create JPEG files that are 20 to 35% smaller compared to libjpeg with similar quality, and still compatible with the JPEG format. The image above shows a close up on a phone line with the original picture, the JPEG picture compressed with libjpeg with the artifacts around the line, and a smaller JPEG picture compressed with Guetzli with less artifacts. You can find out more about the algorithm in the paper entitled “Guetzli: Perceptually […]

Posted on by Jean-Luc Aufranc (CNXSoft) - 16 Comments on How to Reinstall Android Firmware on Realtek RTD1295 TV Boxes

How to Reinstall Android Firmware on Realtek RTD1295 TV Boxes

I started playing with Beelink SEA I TV box nearly two weeks ago, but I soon realized there was a big problem, while I could get an IP address with both Ethernet or WiFi, I could not access Internet, nor the local network with the box, and even ping would not work. So I contact Beelink to find a solution, and they believed I may have a problem with the firmware on my box, and recommended to re-flash it. Great. I asked the firmware, and the company eventually provided me with two files: SEAI_101M0_32G_20170225.img (password: 879y) SEAI_101M0_16G_20170225.img (password: 2js2) Those are baidu link which may be slow to download outside of China, so the company also provided a mirror later. The customer representative told me those were “Lines brushes Pack” firmware, and after lots of email back and forth. I finally got proper instructions which should work for Beelink SEA […]

Posted on by Jean-Luc Aufranc (CNXSoft) - 22 Comments on How to Control Your Air Conditioner with Raspberry Pi Board and ANAVI Infrared pHAT

How to Control Your Air Conditioner with Raspberry Pi Board and ANAVI Infrared pHAT

Leon ANAVI may be a full-time software engineer, but in his spare time he has started to develop open source hardware project with the help of others and by himself. Last year, I got hold of his RabbitMax Flex HAT for Raspberry Pi, and tested it with the provided LCD display, one temperature sensor, and a Raspberry Pi 2 board. The board also featured IR receiver & transmitter, and I tried to use it with my aircon remote control, but at the time I did not find a way to do it easily, and control my TV with LIRC instead. Leon has now made a simpler, smaller, and cheaper add-on board for Raspberry Pi Zero, and other Raspberry Pi boards with a 40-pin header, with 3x I2C headers, two IR transmitters, and one IR receiver. He sent me a sample of “ANAVI Infrared pHAT”, and after quickly describing the board, […]

Posted on by Karl Johnson - 11 Comments on Karl’s Home Automation Project – Part 2: 433 MHz / WiFi MQTT Bridge, Door & PIR Motion Sensors

Karl’s Home Automation Project – Part 2: 433 MHz / WiFi MQTT Bridge, Door & PIR Motion Sensors

Karl here again for part 2 of my home automation project. We will be looking at how to automate your lights based on time of day and motion. In the first part we setup Home Assistant and uploaded firmware to basic Sonoff Wifi switches. Today we will setup a 433 MHz to MQTT bridge and some sensors. 433 MHz Depending on your country 433 MHz is an open frequency to use to communicate with. There are hundreds of different types of devices that use 433 MHz to communicate information. We will be focusing on 2 today from Gearbest: WMS07 motion sensor (left) and WDS07 door/window sensor (2 parts, right). I am not taking the door/window sensor apart, since it is super basic, but I’ve included some photos of the PIR motion detector. 433 MHz Bridge While contemplating how to get presence on a per room basis I ran across this […]

Posted on by Karl Johnson - 30 Comments on Karl’s Home Automation Project – Part 1: Home Assistant & YAML, MQTT, Sonoff, and Xmas Lights

Karl’s Home Automation Project – Part 1: Home Assistant & YAML, MQTT, Sonoff, and Xmas Lights

Karl here. I am here to write about my home automation project. First thing I want to say is that I am very cost conscious and I don’t mind putting in extra effort into the setup of things to keep costs down. I did invest a lot of time and had to do a lot of reading to get my project going. It took while and I received a lot of groans from my wife while testing. I am still in the process of tweaking things. I started watching a series of videos on YouTube from Bruh Automation. He introduced me to Home Assistant. It got me really excited. He uses a Raspberry Pi as a server but I already had a Wintel Pro CX-W8 Smart TV Box which I use as a server. I run 3 Minecraft Servers, Emby Server, iSpyConnect DVR (2 IP Cameras), Unifi wifi controller, and […]

Posted on by Jean-Luc Aufranc (CNXSoft) - 15 Comments on How to Use CHIP Board as a Linux Printer & Scanner Server

How to Use CHIP Board as a Linux Printer & Scanner Server

We have a Canon Pixma MP250 series multi-function USB printer connected to a Windows 10 laptop at home, and for several years, I had no problems printing from my Ubuntu computer to that printer. However, this setup recently stopped to work, and whatever I would do, printing would never start from my Ubuntu PC, even though the file was (allegedly) successfully transfered to the Windows 10 laptop connected to the printer. So I decided to setup my own printer server, as well as a scanner server since it’s a multi-function printer, using one of the boards from my collection. As I opened my cabinet, I wondered whether I would use an Orange Pi board, Raspberry Pi board, or Nano Pi board, but I needed WiFi since there’s no Ethernet in the office where the printer is located, and I found that Next Thing CHIP board was the ideal candidate as […]

Posted on by Jean-Luc Aufranc (CNXSoft) - 2 Comments on CHUWI LapBook 14.1 Windows 10 Firmware, Drivers, and BIOS

CHUWI LapBook 14.1 Windows 10 Firmware, Drivers, and BIOS

In case you’ve installed another operating system like Ubuntu on CHUWI Lapbook 14.1 laptop, and want to re-install Windows 10, CHUWI has released Windows 10 firmware, drivers, and LapBook 14.1 “BIOS” in their forums. So I’ve re-installed Windows 10 on the laptop using the Windows 10 image. You’ll need to download the 8 files CHUWI LapBook 14.1 Windows.part1.rar to CHUWI LapBook 14.1 Windows.part8.rar, and after extracting them you should get a “CHUWI LapBook 14.1 Windows” directory with all necessary files to reinstall Windows. The files take 8GB, so it may not fit on all 8GB flash drives, and you may need to use a 16GB or greater drive. I just copied the files to an 64GB flash drive formatted with NTFS, insert the drive into the USB 2.0 port of the laptop, and I could start the installation process at boot time. However, it quickly failed as it tried to […]

Posted on by Jean-Luc Aufranc (CNXSoft) - 14 Comments on How to Upgrade to Linux 4.8 in Ubuntu 16.04.2

How to Upgrade to Linux 4.8 in Ubuntu 16.04.2

I had read from several news sources that Ubuntu 16.04.2 would come with Linux 4.8. My system was upgraded from Ubuntu 16.04.1 to Ubuntu 16.04.2 this week-end, but I still had Linux 4.4.

So I wondered why that was, and eventually found my answer on Reddit thanks to EndofLineLF user: If it isn’t a new 16.04.2 installation then you won’t have newer kernel. If your install started as 16.04 or 16.04.1 then with all updates installed “lsb_release” will display 16.04.2 as version because that’s what you have. The switch to HWE (Hardware Enablement Stack) was never automatic. So if you want newer kernel you have to install it manually. https://wiki.ubuntu.com/Kernel/RollingLTSEnablementStack#Packages-1 sudo apt-get install –install-recommends xserver-xorg-hwe-16.04 This will also install the new HWE kernel because it is recommended for that package. Upgrading to the new kernel is completely optional, and Linux 4.4 will still get security updates, but I did […]

UP 7000 x86 SBC