Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an Arduino Nano ESP32, a 16x2 I2C LCD, an SD SDHC module, a 4x4 Keypad, and an RFID-RC522 module. The document includes a list of components, wiring details, and the embedded code used in the microcontrollers.

Component List

Arduino Nano ESP32

• Description: A compact microcontroller board based on the ESP32.
• Pins: D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, GND, RST, RX0, TX1, D13, 3.3V, B0, A0, A1, A2, A3, A4, A5, A6, A7, VBUS, B1, VIN

16x2 I2C LCD

• Description: A 16x2 character LCD display with I2C interface.
• Pins: GND, VCC, SDA, SCL

SD SDHC

• Description: An SD card module for reading and writing data.
• Pins: 3V3, CS, MOSI, CLK, MISO, GND

4x4 Keypad (Simulator)

• Description: A 4x4 matrix keypad for user input.
• Pins: R1, C4, R2, C2, R3, R4, C1, C3

RFID-RC522

• Description: An RFID module for reading RFID tags.
• Pins: VCC (3.3V), RST, GND, IRQ, MISO, MOSI, SCK, SDA

Wiring Details

Arduino Nano ESP32

• D12: Connected to MISO of RFID-RC522 and SD SDHC
• D11: Connected to MOSI of RFID-RC522 and SD SDHC
• D10: Connected to SDA of RFID-RC522
• D9: Connected to R1 of 4x4 Keypad
• D8: Connected to R2 of 4x4 Keypad
• D7: Connected to R3 of 4x4 Keypad
• D6: Connected to R4 of 4x4 Keypad
• D5: Connected to C1 of 4x4 Keypad
• D4: Connected to C2 of 4x4 Keypad
• D3: Connected to C3 of 4x4 Keypad
• D2: Connected to C4 of 4x4 Keypad
• GND: Connected to GND of RFID-RC522, 16x2 I2C LCD, and SD SDHC
• D13: Connected to SCK of RFID-RC522 and SD SDHC
• 3.3V: Connected to VCC (3.3V) of RFID-RC522 and 3V3 of SD SDHC
• A0: Connected to CS of SD SDHC
• A2: Connected to RST of RFID-RC522
• A4: Connected to SDA of 16x2 I2C LCD
• A5: Connected to SCL of 16x2 I2C LCD
• VBUS: Connected to VCC of 16x2 I2C LCD

16x2 I2C LCD

• GND: Connected to GND of Arduino Nano ESP32
• VCC: Connected to VBUS of Arduino Nano ESP32
• SDA: Connected to A4 of Arduino Nano ESP32
• SCL: Connected to A5 of Arduino Nano ESP32

SD SDHC

• 3V3: Connected to 3.3V of Arduino Nano ESP32
• CS: Connected to A0 of Arduino Nano ESP32
• MOSI: Connected to D11 of Arduino Nano ESP32
• CLK: Connected to D13 of Arduino Nano ESP32
• MISO: Connected to D12 of Arduino Nano ESP32
• GND: Connected to GND of Arduino Nano ESP32

4x4 Keypad (Simulator)

• R1: Connected to D9 of Arduino Nano ESP32
• R2: Connected to D8 of Arduino Nano ESP32
• R3: Connected to D7 of Arduino Nano ESP32
• R4: Connected to D6 of Arduino Nano ESP32
• C1: Connected to D5 of Arduino Nano ESP32
• C2: Connected to D4 of Arduino Nano ESP32
• C3: Connected to D3 of Arduino Nano ESP32
• C4: Connected to D2 of Arduino Nano ESP32

RFID-RC522

• VCC (3.3V): Connected to 3.3V of Arduino Nano ESP32
• RST: Connected to A2 of Arduino Nano ESP32
• GND: Connected to GND of Arduino Nano ESP32
• MISO: Connected to D12 of Arduino Nano ESP32
• MOSI: Connected to D11 of Arduino Nano ESP32
• SCK: Connected to D13 of Arduino Nano ESP32
• SDA: Connected to D10 of Arduino Nano ESP32

Code Documentation

Arduino Nano ESP32 Code

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

16x2 I2C LCD Code

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

This document provides a comprehensive overview of the circuit, including the components used, their wiring details, and the embedded code. This should serve as a useful reference for understanding and replicating the circuit.