ESP32 and RFID-RC522 Based Smart Access Control System with LCD Display
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Circuit Documentation
Summary
This document provides a detailed overview of a circuit that includes an ESP32 microcontroller, an LCD display, and an RFID reader. The ESP32 serves as the central controller, interfacing with the LCD display via I2C and the RFID reader via SPI. The document includes a component list, wiring details, and code documentation.
Component List
ESP32 DEVKIT V1 (30 pins)
- Description: A versatile microcontroller with built-in Wi-Fi and Bluetooth capabilities.
- Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, VIN, 3V3, D15, D2, D4, RX2, TX2, D5, D18, D19, D21, RX0, TX0, D22, D23
LCD 20x4 I2C
- Description: A 20x4 character LCD display with I2C interface.
- Pins: GND, 5V, SCA, SCL
RFID-RC522
- Description: An RFID reader module that operates at 13.56 MHz.
- Pins: VCC (3.3V), RST, GND, IRQ, MISO, MOSI, SCK, SDA
Wiring Details
ESP32 DEVKIT V1 (30 pins)
- GND: Connected to GND of LCD 20x4 I2C and GND of RFID-RC522
- VIN: Connected to 5V of LCD 20x4 I2C
- 3V3: Connected to VCC (3.3V) of RFID-RC522
- D13: Connected to RST of RFID-RC522
- D15: Connected to SDA of RFID-RC522
- D18: Connected to SCK of RFID-RC522
- D19: Connected to MISO of RFID-RC522
- D21: Connected to SCA of LCD 20x4 I2C
- D22: Connected to SCL of LCD 20x4 I2C
- D23: Connected to MOSI of RFID-RC522
LCD 20x4 I2C
- GND: Connected to GND of ESP32 DEVKIT V1
- 5V: Connected to VIN of ESP32 DEVKIT V1
- SCA: Connected to D21 of ESP32 DEVKIT V1
- SCL: Connected to D22 of ESP32 DEVKIT V1
RFID-RC522
- VCC (3.3V): Connected to 3V3 of ESP32 DEVKIT V1
- RST: Connected to D13 of ESP32 DEVKIT V1
- GND: Connected to GND of ESP32 DEVKIT V1
- SDA: Connected to D15 of ESP32 DEVKIT V1
- SCK: Connected to D18 of ESP32 DEVKIT V1
- MISO: Connected to D19 of ESP32 DEVKIT V1
- MOSI: Connected to D23 of ESP32 DEVKIT V1
Code Documentation
No code is provided for this circuit.
This document provides a comprehensive overview of the circuit, including the components used and their interconnections. The ESP32 microcontroller serves as the central unit, interfacing with both the LCD display and the RFID reader to perform various tasks.