Soldered Header 13.56Mhz MFRC-522 RC522 RFID + S50 Card + Keychain

### Lesson Plan: Understanding and Utilizing the MFRC-522 RC522 RFID Module with S50 Card and Keychain in Electronic Circuits


In this lesson, we will explore the operational principles and practical applications of the MFRC-522 RC522 RFID module, along with the S50 card and keychain. RFID (Radio Frequency Identification) technology is widely used for contactless data exchange, commonly seen in access control systems, payment systems, and inventory tracking. By the end of this lesson, you will have a comprehensive understanding of how the MFRC-522 RC522 works and how to incorporate it into your electronic projects.

**Learning Objectives**

Upon completing this lesson, you will be able to:
1. Identify the physical characteristics of the MFRC-522 RC522 RFID module and S50 card/keychain.
2. Explain the function of an RFID system and its role in electronic circuits.
3. Implement the MFRC-522 RC522 module to read and write data to RFID cards and keychains.

**Materials Needed**

– MFRC-522 RC522 RFID Module
– S50 RFID Card
– S50 RFID Keychain
– Breadboard
– Jumper wires
– Raspberry Pi Pico WH
– Multimeter (optional)

**Background Information**

The MFRC-522 is a highly integrated reader/writer IC for contactless communication at 13.56MHz. It supports various protocols such as ISO/IEC 14443A/MIFARE, and it can interact with RFID cards and keychains to read and write data.

**RFID Module Characteristics**

The MFRC-522 module has several key pins:
– **VCC**: Power supply (typically 3.3V).
– **GND**: Ground.
– **SCK**: Serial Clock.
– **MISO**: Master In Slave Out.
– **MOSI**: Master Out Slave In.
– **SS**: Slave Select.
– **RST**: Reset.
– **IRQ**: Interrupt Request (optional, not used in this lesson).

**Principles of Operation**

RFID systems operate based on radio frequency communication:
– **Transmitting Data**: The reader transmits a signal to power the passive RFID card/keychain.
– **Receiving Data**: The card/keychain sends back data, which is received and processed by the reader.
– **Reading/Writing Data**: The reader can read from and write data to the RFID card/keychain using specific commands.

**Circuit Diagram and Setup**

**Step-by-Step Instructions**

1. **Identify the RFID Module Pins**:
– Locate the VCC, GND, SCK, MISO, MOSI, SS, and RST pins on the MFRC-522 module.

2. **Set Up the Breadboard Circuit**:
– Place the MFRC-522 RFID module on the breadboard.
– Connect the VCC pin of the MFRC-522 to the 3.3V pin on the Raspberry Pi Pico WH.
– Connect the GND pin of the MFRC-522 to the ground (GND) pin on the Raspberry Pi Pico WH.
– Connect the SCK pin of the MFRC-522 to the GPIO pin (e.g., GP2) on the Raspberry Pi Pico WH.
– Connect the MISO pin of the MFRC-522 to the GPIO pin (e.g., GP4) on the Raspberry Pi Pico WH.
– Connect the MOSI pin of the MFRC-522 to the GPIO pin (e.g., GP3) on the Raspberry Pi Pico WH.
– Connect the SS pin of the MFRC-522 to the GPIO pin (e.g., GP5) on the Raspberry Pi Pico WH.
– Connect the RST pin of the MFRC-522 to the GPIO pin (e.g., GP6) on the Raspberry Pi Pico WH.

3. **Write the Control Code**:
– Open your MicroPython IDE and write the following code to interface with the RFID module and read data from the RFID card/keychain:

from machine import Pin, SPI
from mfrc522 import MFRC522

# Initialize SPI and MFRC522
spi = SPI(0, sck=Pin(2), mosi=Pin(3), miso=Pin(4))
rfid = MFRC522(spi, cs=Pin(5), rst=Pin(6))

while True:
(stat, tag_type) = rfid.request(rfid.REQIDL)
if stat == rfid.OK:
print(“Tag detected”)
(stat, raw_uid) = rfid.anticoll()
if stat == rfid.OK:
print(“UID:”, raw_uid)
key = [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]
stat = rfid.auth(rfid.AUTHENT1A, 8, key, raw_uid)
if stat == rfid.OK:
data =
print(“Data:”, data)
print(“Authentication error”)

4. **Upload and Test the Code**:
– Connect your Raspberry Pi Pico WH to your computer using a Micro USB cable.
– Upload the code to the Raspberry Pi Pico WH.
– Place the S50 RFID card or keychain near the RFID reader module and observe the output in the IDE’s console.

5. **Optional: Measure Signal Characteristics**:
– Use a multimeter or an oscilloscope to measure the signal characteristics of the RFID module’s communication lines. Observe the changes in the signal when the RFID card/keychain is brought near the reader.

**Applications and Extensions**

1. **Access Control Systems**:
– Use the MFRC-522 to create access control systems where users can unlock doors or access secured areas by presenting an RFID card/keychain.
– Experiment with different authentication methods and security levels.

2. **Inventory Management**:
– Implement the RFID system to track and manage inventory items, associating each item with a unique RFID tag.
– Create a database to log the movement and status of each item.

3. **Interactive Projects**:
– Use the RFID module in interactive projects where users can trigger actions or events by presenting an RFID card/keychain.
– Combine with other sensors and actuators to create complex interactive systems.

**Summary and Review**

This lesson has provided a detailed exploration of the MFRC-522 RC522 RFID module, covering its identification, operational principles, and practical applications in electronic circuits. By understanding and utilizing RFID technology, you can create contactless data exchange systems for a variety of applications, enhancing the functionality and convenience of your electronic projects.

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