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This is quite simply a Grove module capable of reading the information contained in a uem4100 RFID tag. This low-frequency reader has two information output formats: Wiegand (a very common interface format in this type of reader) and UART.
The reader’s range requires you to maintain a distance of 7 cm or less between the RFID badge reader and the uem4100 card. The Grove SEN11425P reader can be connected to a Base Shield or to the Arduino Mega Board Base Shield by means of a 4-core cable.
RFID technology opens up a great many opportunities: frequently used today in the world of industry and commerce, an RFID reader can also be built for educational projects or for home-made or experimental objects.
Reading the Grove 125 kHz RFID Reader data
Some possibilities include creating a system for opening a door controlled by RFID badge reading, creating a system for identifying an object or garment carrying a flexible or rigid RFID tag to create an anti-theft system – or even creating an interactive business card carrying information about its owner.
Below you will find everything you need to rapidly install and program your RFID reader:
Grove 125 kHz RFID Reader Wiki page
Grove 125 kHz RFID Reader - GitHub (Library)
And finally an introduction to the Grove system: