Sub 20Hz sounds are infrasound and commonly we need special electrical system to pick up the sounds of that range. Infrasounds are low frequency sound waves. They are both mechanical vibrations and acoustic oscillations. They are usually below the threshold of sounds perceptible to the human ear (between 0 Hz and 16 to 20 Hz approximately) At lower frequencies, for physiological reasons, they are … [Read more...]
General
Explanation of different terms used for computer hardware, computer software and in the Internet.
ESP32 Arduino : What is SPI Flash File System (SPIFFS)
The SPI Flash File System or SPIFFS is a light-weight file system for microcontrollers with an SPI flash chip. A flash file system is designed for storing files on flash memory–based storage devices optimized for the particular system. SPI stands for Serial Peripheral Interface. Flash memory is a type of non-volatile storage that is electrically eraseable and rewriteable. Flash memory is a kind … [Read more...]
Kalman Filter to Stabilize Sensor Readings
Kalman Filter Commonly Used to Stabilize Sensor Readings. The Kalman filter reduces the errors of raw measurements, provides estimates for quantities. The Kalman filter is widely used in robotics, navigation, GPS, biomedical, electronic control circuits of ubiquitous communication systems such as radio and computer. It is a mathematical model which can be applied as a snippet. The Kalman filter is … [Read more...]
What is HTTP POST Method?
In some previous Arduino guide, we used HTTP POST method to upload sensor data. What is HTTP POST? HTTP POST is used to send data to a server to create or update a resource where the URL already existing. In the same way, we used HTTP GET with WordPress, HTTP PUT with OpenStack Swift. First, we need to understand what is HTTP POST, second we need to know basic difference with simillar methods such … [Read more...]
What is UART in Plain English?
We often face the phrase universal asynchronous receiver-transmitter in matters like serial communication of Arduino or some shield's of Arduino. What is UART in Plain English? UART is an electronic circuit used to implement digital serial interfaces of computer or peripheral devices. Serial transmission is commonly used for modems, non-networked communication between computers or peripherals. … [Read more...]
What Is a 7Z File? Work With 7Z File on CLI And SSH
Possibly many of the computer user know the process of archiving files is and how to reduce the size of a file. Even if the term 'file archiving' is not be familiar to some, the file types "TAR", “ZIP” and “RAR” are definitely known by every computer user. These formats have become the standard of archiving, providing a good level of compression and user-friendly interface. WinRar archiving … [Read more...]
Solve : Safari Running Slow on MacOS X
Give some time, please. Instead of finding some way faster and try, read this guide. These are normal problems to the high load users. Of course these gives huge pain, but investing an hour in cool head is better than searching the whole earth. If our methods fail, first ask on Apple Community pointing to this guide. Thereafter still you can not solve, it demands checking by an expert. Here is how … [Read more...]
Browser Based User Interface For Git Repositories
We commonly need a light option which opens a basic webpage on localhost. There are actually many browser based user interface for git repositories. Common reasons to avoid these are need of installation of too many packages, consumption of huge RAM etc. However, we are talking about quite basic option which is inbuilt present with git, too basic and another option which is slightly good looking … [Read more...]
How To Install Metasploit on Ubuntu 16.04 LTS To Test Security
White hat or Black hat, hacking demands good grasp of all sysadmin works. The usage style we show on this website are intended for testing security of own servers - that is white hat way. We have a list of essential security tools for GNU/Linux servers. Metasploit framework needs Ruby, Postgre SQL, Java etc. Here is how to install Metasploit on Ubuntu 16.04 LTS to test security of servers. Off … [Read more...]
Bitcoin Mining Guide For Beginners
We talked about cryptocurrency virtual currency. Bitcoin is designed to be generated by hardware & software. Free money is not so easy. Here is Bitcoin Mining Guide For Beginners. Normally we "buy" Bitcoin but Bitcoin is highly secure for transaction as Governmental spyware fails to track. Basic reason to generate, use Bitcoin sarcastically is not for making free money but for higher privacy. … [Read more...]
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