Microchips projects

Today, I'd like to introduce the system I've been developing last week. I made an RFID system to open the electronic door. The system is built on components for Arduino, ie a 13.56MHz RC522 card reader and keypad, compatible cards and keychains. The reader is able to read the ISO / IEC 14443 A standard cards. This standard also works on ISICs, ATMs, or busses, and can also be read and used for such a project. By reader, I read the MAC address of the cards (it can also be read and write in the memory of the cards and the key, which is mostly 1kB or 4kB), the MAC addresses I read to convert to a specific DEC format. In the role of the microcontroller for processing and sending data, I used a NodeMCU board that has wifi connectivity and is more than adequate for this purpose. The system is suitable for halls, corporate entrance gates, electronic doors and similar applications. The task of NodeMCU is to send data to the web backend whenever it logs the card and opens or unlocks

Today, we will devote our microcontroller and its general use to a rather unusual purpose. Specifically, I will be talking about how I made a microcontroller from a webscraper. (If this can be called when processing your own backend information). As many of you know, a web scraper is a device that performs the task of retrieving information from that web site. The most wanted information from websites is e-mail addresses, phone numbers. Recently, however, this phenomenon is also used for a variety of statistical tasks where the scraper receives data on products, their prices, and evaluates them. Even similar devices are used as robots for trading with cryptomas or common names. At the most appropriate time (statistically) the robot pedal and bought another - a suitable menu with a rising tendency. In my case, I was interested in getting information from websites, specifically phone numbers and email addresses. We will therefore go directly to the realization. I have used 3 kinds