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-64af05bab3e91580135390/] This article is … [Read more...]
8 Fun and Easy PC Games You Can Play Offline
Free PC games offer a fun and inexpensive way to pass the time and enjoy some entertainment without spending a dime. With thousands of excellent free games available, you're sure to find options that suit your gaming tastes and provide hours of distraction. Free-to-play PC games cover a wide range of genres, from simple arcade and puzzle games to more involved strategy, action and adventure … [Read more...]
What is Pulse Width Modulation (PWM)?
Pulse Width Modulation (PWM) or Pulse Duration Modulation is a type of modulation in which a technical quantity of electrical voltage changes between two values. At a constant frequency, the duty cycle of a square wave pulse is modulated, i.e. the duration of the pulses forming it. It is used to generate a pseudo-analog signal from a digital or analog environment to allow processing of this signal … [Read more...]
API Key Based Authentication in PHP Based Backend for Arduino, ESP32
The difficulty with the Internet of Things deployment for hobbyists and makers is out of the absence of a simple open-source GPL-ed platform (like we have WordPress, Magento, Joomla, and OctoPress for content management). MQTT is often not easy for this segment, examples with HTTP are too less. The Present Scenario of IoT Platforms Blynk.io decided to shut down the Blynk app … [Read more...]
What is General-Purpose Input/Output (GPIO)?
GPIO (General Purpose Input/Output) ports are I/O ports widely used in the world of microcontrollers, especially in the field of embedded electronics. Usage of this term appeared in the early 80s. GPIO are placed on an electronic circuit in order to communicate with electronic components and external circuits. These can be detectors or sensors to capture data, or to control commands. GPIO contacts … [Read more...]
Toggle Button Status Update (PHP, MySQL, AJAX)
Our This guide ESP32 Arduino IoT Relay Control is self-hosted. The working result is here. This kind of project serves the purpose but the UI is just pathetic and you can not easily convert it to an Android or iOS app. Most of us want a working system to get a toggle button control like this one. These days, you have a lot of options for UI such as React.js or just Twitter Bootstrap. You have … [Read more...]