Circuit Documentation

Summary

This circuit involves an Arduino Mega 2560 microcontroller interfacing with multiple LEDs, resistors, RFID-RC522 modules, and piezo sensors. The circuit is designed to demonstrate basic LED control, RFID communication, and sensor integration.

Component List

1. LED: Two Pin (green)

   • Pins: cathode, anode
   • Description: Green LED
   • Purpose: Visual indicator

2. LED: Two Pin (red)

   • Pins: cathode, anode
   • Description: Red LED
   • Purpose: Visual indicator

3. LED: Two Pin (yellow)

   • Pins: cathode, anode
   • Description: Yellow LED
   • Purpose: Visual indicator

4. Resistor

   • Pins: pin1, pin2
   • Description: 220 Ohms resistor
   • Purpose: Current limiting for LEDs

5. RFID-RC522

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

6. Arduino Mega 2560

   • Pins: IOREF, RESET, 3V3, 5V, GND, VIN, A0-A15, D0-D53, AREF, SDA, SCL
   • Description: Microcontroller board
   • Purpose: Central control unit

7. Piezo Sensor

   • Pins: +, -
   • Description: Piezoelectric sensor
   • Purpose: Detecting vibrations

Wiring Details

Arduino Mega 2560

• 3V3

  • Connected to VCC (3.3V) of all RFID-RC522 modules

• 5V

  • Connected to pin2 of multiple resistors

• GND

  • Connected to anode of multiple LEDs
  • Connected to GND of all RFID-RC522 modules

• D52

  • Connected to SDA of one RFID-RC522 module

• D50

  • Connected to IRQ of two RFID-RC522 modules

• D48

  • Connected to RST of one RFID-RC522 module

• D44

  • Connected to MISO of all RFID-RC522 modules

• D42

  • Connected to SCK of all RFID-RC522 modules

• D36

  • Connected to pin1 of one resistor

• D34

  • Connected to pin1 of one resistor

• D32

  • Connected to pin1 of one resistor

• D30

  • Connected to pin2 of one resistor

• D28

  • Connected to pin2 of one resistor

• D26

  • Connected to pin2 of one resistor

• D24

  • Connected to IRQ of one RFID-RC522 module

• D22

  • Connected to RST of one RFID-RC522 module

• D53

  • Connected to IRQ of one RFID-RC522 module

• D51

  • Connected to RST of two RFID-RC522 modules

• D49

  • Connected to SDA of one RFID-RC522 module

• D45

  • Connected to MOSI of all RFID-RC522 modules

• D43

  • Connected to SDA of one RFID-RC522 module

• D37

  • Connected to pin1 of one resistor

• D35

  • Connected to pin1 of one resistor

• D33

  • Connected to pin1 of one resistor

• D31

  • Connected to pin2 of one resistor

• D29

  • Connected to pin2 of one resistor

• D27

  • Connected to pin2 of one resistor

• D23

  • Connected to SDA of one RFID-RC522 module

LEDs

• Green LED

  • Cathode connected to pin2 of one resistor
  • Anode connected to GND of Arduino Mega 2560

• Red LED

  • Cathode connected to pin2 of one resistor
  • Anode connected to GND of Arduino Mega 2560

• Yellow LED

  • Cathode connected to pin2 of one resistor
  • Anode connected to GND of Arduino Mega 2560

Resistors

• 220 Ohms Resistor
  • Pin1 connected to various digital pins of Arduino Mega 2560
  • Pin2 connected to cathode of various LEDs and 5V of Arduino Mega 2560

RFID-RC522

• VCC (3.3V)

  • Connected to 3V3 of Arduino Mega 2560

• GND

  • Connected to GND of Arduino Mega 2560

• SDA

  • Connected to various digital pins of Arduino Mega 2560

• IRQ

  • Connected to various digital pins of Arduino Mega 2560

• RST

  • Connected to various digital pins of Arduino Mega 2560

• MISO

  • Connected to D44 of Arduino Mega 2560

• MOSI

  • Connected to D45 of Arduino Mega 2560

• SCK

  • Connected to D42 of Arduino Mega 2560

Piezo Sensors

• +

  • Not connected in the provided net list

• -

  • Not connected in the provided net list

Documented 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