Circuit Documentation

Summary

This circuit involves an Arduino UNO microcontroller interfacing with various components including LEDs, a 4×4 Keypad, a 16x2 I2C LCD, a Micro servo, an RFID-RC522 module, and a Piezo Buzzer. The circuit is designed to demonstrate basic input and output operations, including reading from a keypad, displaying information on an LCD, controlling a servo motor, and using an RFID reader.

Component List

1. Arduino UNO

   • Description: A microcontroller board based on the ATmega328P.
   • Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0

2. LED: Two Pin (red)

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

3. LED: Two Pin (green)

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

4. 4×4 Keypad

   • Description: A keypad with 4 rows and 4 columns.
   • Pins: C3, C2, C4, C1, R1, R2, R3, R4

5. 16x2 I2C LCD

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

6. Micro servo 9G

   • Description: A small servo motor.
   • Pins: GND, +5V, PWM

7. Resistor (220 Ohms)

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

8. RFID-RC522

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

9. Piezo Buzzer

   • Description: A piezoelectric buzzer.
   • Pins: pin 1, pin 2

Wiring Details

Arduino UNO

• D8 connected to Resistor (pin1)
• 5V connected to 16x2 I2C LCD (VCC), LED: Two Pin (green) (anode), Micro servo 9G (+5V)
• GND connected to 16x2 I2C LCD (GND), Piezo Buzzer (pin 2), LED: Two Pin (red) (cathode), Micro servo 9G (GND), RFID-RC522 (GND)
• D6 connected to Resistor (pin2), Resistor (pin1)
• 3.3V connected to RFID-RC522 (VCC (3.3V))
• A0 connected to 4×4 Keypad (R1)
• A1 connected to 4×4 Keypad (R2)
• A2 connected to 4×4 Keypad (R3)
• A3 connected to 4×4 Keypad (R4)
• A4 connected to 16x2 I2C LCD (SDA)
• A5 connected to 16x2 I2C LCD (SCL)
• D13 connected to RFID-RC522 (SCK)
• D12 connected to RFID-RC522 (MISO)
• D11 connected to RFID-RC522 (MOSI)
• D10 connected to RFID-RC522 (SDA)
• D9 connected to RFID-RC522 (RST)
• D7 connected to Micro servo 9G (PWM)
• D5 connected to 4×4 Keypad (C1)
• D4 connected to 4×4 Keypad (C2)
• D3 connected to 4×4 Keypad (C3)
• D2 connected to 4×4 Keypad (C4)

LED: Two Pin (red)

• anode connected to Resistor (pin1)
• cathode connected to Arduino UNO (GND)

LED: Two Pin (green)

• anode connected to Arduino UNO (5V)
• cathode connected to Resistor (pin2)

4×4 Keypad

• R1 connected to Arduino UNO (A0)
• R2 connected to Arduino UNO (A1)
• R3 connected to Arduino UNO (A2)
• R4 connected to Arduino UNO (A3)
• C1 connected to Arduino UNO (D5)
• C2 connected to Arduino UNO (D4)
• C3 connected to Arduino UNO (D3)
• C4 connected to Arduino UNO (D2)

16x2 I2C LCD

• VCC connected to Arduino UNO (5V)
• GND connected to Arduino UNO (GND)
• SDA connected to Arduino UNO (A4)
• SCL connected to Arduino UNO (A5)

Micro servo 9G

• GND connected to Arduino UNO (GND)
• +5V connected to Arduino UNO (5V)
• PWM connected to Arduino UNO (D7)

Resistor (220 Ohms)

• pin1 connected to Arduino UNO (D8), LED: Two Pin (red) (anode)
• pin2 connected to Resistor (pin1), Arduino UNO (D6), LED: Two Pin (green) (cathode)

RFID-RC522

• VCC (3.3V) connected to Arduino UNO (3.3V)
• GND connected to Arduino UNO (GND)
• SCK connected to Arduino UNO (D13)
• MISO connected to Arduino UNO (D12)
• MOSI connected to Arduino UNO (D11)
• SDA connected to Arduino UNO (D10)
• RST connected to Arduino UNO (D9)

Piezo Buzzer

• pin 1 connected to Resistor (pin2)
• pin 2 connected to Arduino UNO (GND)

Documented Code

Arduino UNO Code (sketch.ino)

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

}

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

}

Documentation (documentation.txt)