Bogusław Kempny

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About HC-SR04 LCD Camera fork() Short Message Service strfry() GPIO pulses Keypad Gate GPIO PWM SG90 RFID Graphologist Time and attendance Shutdown ....


My name is Bogusław Kempny.

For several years I have been dealing with, among other things, Raspberry PI computers.

If you are on this page, you probably know what Raspberry PI is, so I won't explain.

If you don't know and you want to know, what is the internet for?

I was fascinated by these toys, a simple, small, cheap computer, and powerful possibilities.

Their reliability is also astonishing, not only that they withstand extreme conditions, for example in an unheated tin barrack, but also patiently endure accidental mistreatment when starting the system.

Of course, I do not suggest checking it personally, it is better, if you take my word for it, I have damaged only one so far - mechanically, with a drill, while mounting it in the housing.

And mistakes are made during the experiments, wrong supply voltage, short-circuited GPIO pins, power overload, sparks from static electricity ...

It would seem that they are great for fun, but for serious purposes it is better not to use them.

Nothing could be more wrong.

The ones that I have already installed have been working 24 hours a day for several years, they control breathalyzers, open doors, barriers, gates, turnstiles, take photos, and control a petrol station distributor.

I don't like the fact that the information on Raspberry on the internet is embarrassingly low.

If there is already a prototype board, two cables, a diode plus three lines of python code is a serious article / presentation.

The information is provided unreliably, without verification, the same in many places, copied with the mouse and decorated with different graphics.

I know that I cannot fix the world, but I decided to change it a bit, hence the idea of this website, where I would like to (I hope it will not be overly graphomaniac) describe some solutions that I personally made and checked.