What is C code for rf metal detector robot by using pic 16f877A for transmitter & receiver side....?
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EM-18 RFID reader module is the most commonly used module for radio-frequency identification projects. It offers low cost, small size, low power consumption and easy to use. It can be directly connected to micro-controllers using UART communication. UART software can be used for micro-controllers that do not have UART modules. In this tutorial we will see how to connect the RFID reader module EM-18 with the micro-controller PIC 16F877A. By understanding the basic idea, you will be able to interface with any micro-controller.
RFID work
The RFID reader module EM-18 generates and radiates RF signals of frequency 125KHz through its coils. When you insert a passive RFID tag of 125KHz (without battery) in this field, it will be energized with it. These RFID tags are usually made using a CMOS IC EM4102. It obtains enough power and master clock for its operations of the electromagnetic fields produced by RFID Reader.
![[Image: RFID-System-Principle-600x457.jpg]](https://electrosome.com/wp-content/uploads/2014/11/RFID-System-Principle-600x457.jpg)
By changing the modulation current through the coils, the label will return the information contained in the factory programmed memory array.