Circuit Documentation

Summary

This circuit involves an Arduino Nano microcontroller interfacing with various components including LEDs, a servo motor, an RFID reader, an I2C LCD, and a buzzer. The circuit is designed to demonstrate basic input/output operations, control of a servo motor, and communication with an RFID reader and an LCD display.

Component List

1. Arduino Nano

   • Description: A small, complete, and breadboard-friendly board based on the ATmega328P.
   • Pins: D1/TX, D0/RX, RESET, GND, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11/MOSI, D12/MISO, VIN, 5V, A7, A6, A5, A4, A3, A2, A1, A0, AREF, 3V3, D13/SCK

2. LED: Two Pin (red)

   • Description: A red LED with two pins.
   • Pins: cathode, anode

3. LED: Two Pin (green)

   • Description: A green LED with two pins.
   • Pins: cathode, anode

4. Tower Pro SG90 servo

   • Description: A small servo motor used for precise control of angular position.
   • Pins: Signal, +5V, GND

5. Resistor (220 Ohms)

   • Description: A resistor with a resistance of 220 Ohms.
   • Pins: pin1, pin2

6. RFID-RC522

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

7. 16x2 I2C LCD

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

8. Buzzer

   • Description: A simple buzzer for sound output.
   • Pins: PIN, GND

Wiring Details

Arduino Nano

• GND connected to:

  • RFID-RC522 (GND)
  • Tower Pro SG90 servo (GND)
  • LED: Two Pin (red) (cathode)
  • LED: Two Pin (green) (cathode)
  • Buzzer (GND)
  • 16x2 I2C LCD (GND)

• D9 connected to:

  • Tower Pro SG90 servo (Signal)
  • RFID-RC522 (RST)

• 5V connected to:

  • Tower Pro SG90 servo (+5V)
  • 16x2 I2C LCD (VCC)

• D2 connected to:

  • Resistor (pin1)

• D3 connected to:

  • Resistor (pin1)

• D8 connected to:

  • Buzzer (PIN)

• D10 connected to:

  • RFID-RC522 (SDA)

• D11/MOSI connected to:

  • RFID-RC522 (MOSI)

• D12/MISO connected to:

  • RFID-RC522 (MISO)

• A5 connected to:

  • 16x2 I2C LCD (SCL)

• A4 connected to:

  • 16x2 I2C LCD (SDA)

• 3V3 connected to:

  • RFID-RC522 (VCC (3.3V))

• D13/SCK connected to:

  • RFID-RC522 (SCK)

LED: Two Pin (red)

• cathode connected to:
  • Arduino Nano (GND)
• anode connected to:
  • Resistor (pin2)

LED: Two Pin (green)

• cathode connected to:
  • Arduino Nano (GND)
• anode connected to:
  • Resistor (pin2)

Tower Pro SG90 servo

• Signal connected to:
  • Arduino Nano (D9)
  • RFID-RC522 (RST)
• +5V connected to:
  • Arduino Nano (5V)
  • 16x2 I2C LCD (VCC)
• GND connected to:
  • Arduino Nano (GND)
  • RFID-RC522 (GND)

Resistor (220 Ohms)

• pin1 connected to:
  • Arduino Nano (D2)
  • Arduino Nano (D3)
• pin2 connected to:
  • LED: Two Pin (red) (anode)
  • LED: Two Pin (green) (anode)

RFID-RC522

• GND connected to:
  • Arduino Nano (GND)
  • Tower Pro SG90 servo (GND)
• RST connected to:
  • Arduino Nano (D9)
  • Tower Pro SG90 servo (Signal)
• VCC (3.3V) connected to:
  • Arduino Nano (3V3)
• SDA connected to:
  • Arduino Nano (D10)
• MOSI connected to:
  • Arduino Nano (D11/MOSI)
• MISO connected to:
  • Arduino Nano (D12/MISO)
• SCK connected to:
  • Arduino Nano (D13/SCK)

16x2 I2C LCD

• GND connected to:
  • Arduino Nano (GND)
• VCC connected to:
  • Arduino Nano (5V)
  • Tower Pro SG90 servo (+5V)
• SDA connected to:
  • Arduino Nano (A4)
• SCL connected to:
  • Arduino Nano (A5)

Buzzer

• PIN connected to:
  • Arduino Nano (D8)
• GND connected to:
  • Arduino Nano (GND)

Documented Code

Arduino Nano Code (sketch.ino)

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

}

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

}

Additional Documentation (documentation.txt)