Monday, February 19, 2018

Circuit Schematic Raspberry Pi RFID Reader Interface using the EM-18 RFID Reader

Eltronicschool. - This is one circuit schematic for you who want to impplement your RFID reader with Respberry Pi in this time. With this circuit schematic, now you can learn more to connect and program your project based on RFID and Raspberry.

In this time, eside we will show you circuit schematic, we also will give you the description of this circuit and the last we will give you the link to read more about this circuit schematic from original source.

Circuit Schematic

Component Part

  • Raspberry Pi 3 Model B
  • EM-18 RFID Reader Module
  • RS232 – to – USB Adapter (as my RFID Reader has only RS232 Output)
  • Few RFID Cards or RFID Tags
  • Power Supply for RFID Reader (my RFID Reader has a 5V Regulator)
  • 5V Supply for Raspberry Pi and RS232-USB Adapter
  • Connecting Wires
  • 680Ω Resistor (1/4 Watt)
  • 1.5KΩ Resistor (1/4 Watt)


Circuit schematic like in Figure 1 above is Raspberry Pi RFID Reader Interface using the EM-18 RFID Reader. Electronicshub site describe that On Raspberry Pi, the GPIO14 and GPIO14 i.e. Physical Pins 8 and 10 are the UART TX and RX Pins respectively. As we have already enabled the Serial Port of the Raspberry Pi, you can connect these pins to the external peripherals.

It is now a good time to note that Raspberry Pi works on 3.3V Logic. Hence, the RX Pin of the Raspberry Pin must only be given with 3.3V Logic. In order to do that, we need to level convert the TX line of the RFID Reader to 3.3V using a simple Voltage Divider Network consisting to two resistors.

I have used 680Ω and 1.5KΩ resistors. The output of the voltage divider is connected to the UART RXD pin of the Raspberry Pi i.e. GPIO15. Make a common ground connection between the Raspberry Pi and the RFID Reader Module.

And now you can read more about the Raspberry Pi RFID Reader Interface using the EM-18 RFID Reader circuit schematic from original source using link HERE.

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