In the previous article I described the basic of the MQTT communication protocol, now I will discuss the practical use of communication using the Mosquitto broker. Mosquitto is a lightweight broker that supports the MQTT protocol provided by the Eclipse Foundation under the EPL/EDL license. Installing a Broker The following method will install Mosquitto on […]
Reinstalling the operating system I decided to go back to Debian. Overall, everything on the plus except that the Eagle program did not want to run. After a manual attempt to start the terminal, a message appeared: $./eagle Terminate called after throwing an instance of ‘ std:: runtime_error ‘ What (): Locale:: facet:: _S_create_c_locale name […]
The project was created as a manifestation of total laziness, there is nothing worse than give up from the writing program to switch on light, or turn off in the morning. The target are simple, the possibility of switching on and off the lighting, and adjusting the brightness. In addition, the system must be invisible […]
Recently, during the project, there was a need to implement a system that was meant to signalize whether it is a phase or not. And that the system output signal is acceptable for the microcontroller. I have considered a few options that I’ll show below. It should be remembered that in the presented systems there […]
The MQTT communication protocol is based on the publication and subscription pattern. Its main advantage is lightness, so it can be implemented in very small microprocessor systems, and at low data transmission. MQTT was created by Andy Stanford-Clark and Mihaelaanca Nippera in 1999 year. The MQTT protocol is a special application in the IoT industry. […]
Small Metex Lab has gained Windows version by using the QTSerialPort library, which became independent the program from the operating system. You can download Windows versions here. In addition, I can also show a short film presenting some of the possibilities of the program: In the future I plan to have a small extension of […]
Having the Metex multimeter at my disposal I decided to use its function to transmit the measured value via RS-232. The starting target was the display of measured values, recognition functions and units of the measured parameter. Ultimately, I developed a firm presentation of the data and in the end result in the program we have […]
During the etching of the circuit on the PCB laminate I record a film of type Time lapse. Effects can be viewed below.