The BEEP terminal will become LOW to indicate valid tag detection. When a RFID Tag is bring in to the field of EM-18 RFID Reader, it will read its tag number and give output via TX terminal. You may also use Software UART if a dedicated UART module is not available. For 3.3V devices you need to add additional voltage divider resistors to reduce 5V to 3.3V. Passive RFID Tag Block Diagram Interfacing with PIC MicrocontrollerĮM-18 RFID Reader Module can be directly interfaced with 5V PIC Microcontrollers using UART module. RFID – System Principleīy changing the modulation current through the coils, tag will send back the information contained in the factory programmed memory array. It gets enough power and master clock for its operations from the electromagnetic fields produced by RFID Reader.
These RFID Tags are usually made using a CMOS IC EM4102. When a 125KHz Passive RFID Tag (have no battery) is brought in to this field, will get energized from it. The EM-18 RFID Reader module generates and radiates RF Carrier Signals of frequency 125KHz through its coils. By understanding the basic idea, you will be able to interface it with any microcontrollers.
In this tutorial we will see How to Interface EM-18 RFID Reader Module with PIC 16F877A Microcontroller. Software UART can be used for microcontrollers having no UART modules. It can be directly interfaced with microcontrollers using UART communication. It features Low Cost, Small Size, Low Power Consumption and Easy to use. EM-18 RFID Reader Module is the one the most commonly used module for Radio Frequency Identification Projects.
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