Circuit Documentation

Summary

This circuit involves an Arduino Mega 2560 microcontroller interfacing with various components including stepper motors, an I2C LCD, an RFID reader, a membrane keypad, and ULN 2003 motor drivers. The circuit is designed to control multiple stepper motors, display information on an LCD, read RFID tags, and accept input from a keypad.

Component List

1. Arduino Mega 2560

   • Description: A microcontroller board based on the ATmega2560.
   • Pins: IOREF, RESET, 3V3, 5V, GND, VIN, A0-A15, D0-D53, AREF, SDA, SCL

2. 28BYJ-48 Stepper Motor

   • Description: A small, inexpensive stepper motor.
   • Pins: BLUE, PINK, YELLOW, ORANGE, RED

3. Connector 5V

   • Description: A connector providing 5V power.
   • Pins: GND, VCC

4. 16x2 I2C LCD

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

5. RFID-RC522

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

6. 4X4 Membrane Matrix Keypad

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

7. ULN 2003

   • Description: A Darlington transistor array used to drive the stepper motors.
   • Pins: IN1-IN7, GND, +, COIL1-COIL5

Wiring Details

Arduino Mega 2560

• 5V to 16x2 I2C LCD VCC
• 3V3 to RFID-RC522 VCC (3.3V)
• GND to 16x2 I2C LCD GND
• GND to RFID-RC522 GND
• D21/SCL to 16x2 I2C LCD SCL
• D20/SDA to 16x2 I2C LCD SDA
• D2 PWM to 4X4 Membrane Matrix Keypad R1
• D3 PWM to 4X4 Membrane Matrix Keypad R2
• D4 PWM to 4X4 Membrane Matrix Keypad R3
• D5 PWM to 4X4 Membrane Matrix Keypad R4
• D6 PWM to 4X4 Membrane Matrix Keypad C1
• D7 PWM to 4X4 Membrane Matrix Keypad C2
• D8 PWM to 4X4 Membrane Matrix Keypad C3
• D9 PWM to 4X4 Membrane Matrix Keypad C4
• D52 to RFID-RC522 SDA
• D50 to RFID-RC522 SCK
• D53 to RFID-RC522 MOSI
• D51 to RFID-RC522 MISO
• D44 to ULN 2003 IN4
• D42 to ULN 2003 IN3
• D40 to ULN 2003 IN2
• D38 to ULN 2003 IN1
• D30 to ULN 2003 IN4
• D28 to ULN 2003 IN3
• D26 to ULN 2003 IN2
• D24 to ULN 2003 IN1
• D45 to ULN 2003 IN4
• D43 to ULN 2003 IN3
• D41 to ULN 2003 IN3
• D39 to ULN 2003 IN2
• D37 to ULN 2003 IN1
• D31 to ULN 2003 IN4
• D29 to ULN 2003 IN3
• D27 to ULN 2003 IN2
• D25 to ULN 2003 IN1

28BYJ-48 Stepper Motor

• BLUE to ULN 2003 COIL1
• PINK to ULN 2003 COIL2
• YELLOW to ULN 2003 COIL3
• ORANGE to ULN 2003 COIL4
• RED to ULN 2003 COIL5

Connector 5V

• VCC to ULN 2003 +
• GND to ULN 2003 GND

16x2 I2C LCD

• VCC to Arduino Mega 2560 5V
• GND to Arduino Mega 2560 GND
• SCL to Arduino Mega 2560 D21/SCL
• SDA to Arduino Mega 2560 D20/SDA

RFID-RC522

• VCC (3.3V) to Arduino Mega 2560 3V3
• GND to Arduino Mega 2560 GND
• SDA to Arduino Mega 2560 D52
• SCK to Arduino Mega 2560 D50
• MOSI to Arduino Mega 2560 D53
• MISO to Arduino Mega 2560 D51

4X4 Membrane Matrix Keypad

• R1 to Arduino Mega 2560 D2 PWM
• R2 to Arduino Mega 2560 D3 PWM
• R3 to Arduino Mega 2560 D4 PWM
• R4 to Arduino Mega 2560 D5 PWM
• C1 to Arduino Mega 2560 D6 PWM
• C2 to Arduino Mega 2560 D7 PWM
• C3 to Arduino Mega 2560 D8 PWM
• C4 to Arduino Mega 2560 D9 PWM

ULN 2003

• + to Connector 5V VCC
• GND to Connector 5V GND
• IN1 to Arduino Mega 2560 D38, D24, D37, D25
• IN2 to Arduino Mega 2560 D40, D26, D39, D27
• IN3 to Arduino Mega 2560 D42, D28, D43, D29
• IN4 to Arduino Mega 2560 D44, D30, D45, D31
• COIL1 to 28BYJ-48 Stepper Motor BLUE
• COIL2 to 28BYJ-48 Stepper Motor PINK
• COIL3 to 28BYJ-48 Stepper Motor YELLOW
• COIL4 to 28BYJ-48 Stepper Motor ORANGE
• COIL5 to 28BYJ-48 Stepper Motor RED

Code Documentation

Arduino Mega 2560 Code

sketch.ino

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

}

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

}

documentation.txt

This documentation provides a comprehensive overview of the circuit, including a summary, detailed component list, wiring details, and the code used in the Arduino Mega 2560 microcontroller.