In blogging, a ping is an XML remote procedure call (a form of a message) by which a blog informs one or more servers that its content has been published or modified. Ping was first used by Dave Winer on weblogs.com in 2001 and that standard is used still today. Open ping servers allow all kind of web services to subscribe to the list of blogs that have recently pinged them. Search engines can … [Read more...]
Archives for June 2023
What is the Difference Between Ubuntu and Debian on Server?
Debian is a collaboratively developed free operating system. Debian GNU/Linux is based on the basic system tools of the GNU Project as well as the Linux kernel. Debian offers a wide range of application programs and tools. Debian was founded in August 1993. Today, the project has over 1000 official developers. It is one of the oldest, most influential, and most widely used GNU/Linux distributions. … [Read more...]
How Analog-to-Digital Converter (ADC) Works
An analogue-to-digital converter (ADC) is an electronic device whose function is to translate an analogue quantity into a digital value encoded on several bits. The converted signal is usually an electrical voltage. As we have explained before, the GPIO pins of any microcontroller board such as Arduino, ESP32 etc can handle digital input or output only. The analogue pins of Arduino are an … [Read more...]
How to Save Sensor Data from ESP32/Arduino to InfluxDB
There are some databases which are suitable for use with Arduino, ESP32 etc microcontrollers. We can indeed use MySQL (and PHP) to create IoT projects like this one. However that approach requires own API server and such method has limitations. It is a complicated method and presents app and web development moving away from PHP and MySQL/MariaDB. These days it is convenient to use Create React App … [Read more...]
WordPress Optimisation: Maximising Speed and Performance
Ensuring that your WordPress website runs both swiftly and smoothly is not just a preference—it's a necessity. In the current digital age, a lightning-fast user experience forms the cornerstone of online business, playing a pivotal role in maintaining visitors' engagement and ensuring their return. Moreover, website performance isn't just about end-users; it is also integral to the digital … [Read more...]
What We Have Learned From Titan Submarine Incident
The 2023 accident of the submersible Titan occurred during a dive into the international waters of the North Atlantic Ocean off Newfoundland, Canada. The Titan is a small submersible for tourism purposes, operated by OceanGate and intended particularly to ensure paid visits to the wreck of the Titanic. On June 18, 2023, it began a descent towards the wreckage during which it suffered an implosion … [Read more...]
List of GPL Compatible Fonts (100% Safe to Commercially Use)
When we are talking about Apache server or MariaDB or WordPress, we do not have any fear of getting prosecuted. We can develop products without paying any fees, virtually without reading their licensing terms, and we can claim ourselves as "experts" after developing a significant amount of skill. Even we charge our clients for downloading and installing the products. Adding a GNU GPL license … [Read more...]
Troubleshoot Not enabling PHP x.y FPM by default Notice on Ubuntu Server
If you are receiving the notice "Not enabling PHP x.y FPM by default" (with Apache webserver) after upgrading your Ubuntu server then you need to spend time behind the server and remain attentive during reboot. After I received this notice, I Google searched and read at least 50 web pages to understand where the error is arriving. The main information I got from Linode's community: … [Read more...]
What is Imperative Programming
Imperative programming is the longest-known programming paradigm. Due to the language range of earlier programming languages, this approach was formerly the classic way of programming. It is the basis for the design of many programming languages, for example, ALGOL, BASIC, Fortran, Pascal, Cobol, C and all assembly languages. Almost all processors are imperative: they are made to execute a … [Read more...]
Arduino 12 LED Meter (Bar Graph) With Potentiometer for Various Projects
There are various ways to create a LED Meter or Bar Graph with a few square LEDs of three colours and demonstrate the function with a potentiometer. There is nothing new with this idea since official documentation of Arduino already has one example of bar graph. However, not all of them are practical to use with every project. The sensors in real often do not generate a voltage (or PWM signal) as … [Read more...]
LED Chaser Effect With PWM Using Arduino
In our earlier article, We have discussed PWM and informed you that this PWD technology is used in particular for light-emitting diodes (LEDs), as they are often used as backlights on mobile phones or brake lights in newer motor vehicles. Our older article on Breathing LED also uses PWM. This was the sketch, LED is attached to pin 11: [crayon-650c515bd3091517543957/] This article is … [Read more...]