Wireless_Technologies_RFID_STM32.pptx project

Embedded

1. Wireless Technologies - Interfacing RFID with STM32 Prepared by Yeswanth Sangamreddi

2. Introduction • RFID (Radio Frequency Identification) is a wireless technology used to identify and track objects. • It uses radio waves to transmit data from an RFID tag to a reader. • STM32 microcontrollers can interface with RFID modules to read tag data for various applications.

3. Components Required • STM32 Nucleo or STM32F4 Board • RFID Reader Module (RC522 or EM-18) • RFID Tags/Cards • Jumper Wires • LCD Display or Serial Monitor

4. Circuit Connection (Example: EM-18 with STM32) RFID Pin | STM32 Pin | Description ---------------------------------- VCC | 5V | Power supply GND | GND | Ground TX | PA10 (RX) | Data from RFID to STM32 RX | PA9 (TX) | Optional

5. Working Principle 1. When an RFID tag comes near the reader, its unique ID is transmitted. 2. The reader converts the radio signal into serial data. 3. STM32 receives this data via UART and processes it. 4. The tag ID can be displayed or used for control actions.

6. Sample Code (UART Interface) #include "stm32f4xx.h" char data[12]; void USART1_IRQHandler(void) { if (USART1->SR & USART_SR_RXNE) { char r = USART1->DR; } } void main(void) { // Initialize UART and wait for tag data }

7. Applications • Attendance and Access Control Systems • Inventory and Asset Tracking • Vehicle Identification • Library Book Management • Smart Retail and Automation

8. Conclusion • RFID provides wireless data communication between tag and reader. • STM32 can easily interface with RFID modules using UART or SPI. • This combination is widely used in automation, security, and tracking applications.