Circuit Documentation

Summary

This circuit involves an Arduino UNO microcontroller interfacing with various components including resistors, LEDs, a buzzer, an ESP8266 NodeMCU, a 16x2 I2C LCD, and an RFID-RC522 module. The circuit is designed to demonstrate basic interfacing and control of these components using the Arduino platform.

Component List

Resistor

• Description: A passive electrical component that implements electrical resistance as a circuit element.
• Pins: pin1, pin2
• Properties:
  • Resistance: 100 Ohms

Resistor

• Description: A passive electrical component that implements electrical resistance as a circuit element.
• Pins: pin1, pin2
• Properties:
  • Resistance: 330 Ohms

LED: Two Pin (red)

• Description: A red light-emitting diode.
• Pins: cathode, anode

LED: Two Pin (green)

• Description: A green light-emitting diode.
• Pins: cathode, anode

Buzzer

• Description: An audio signaling device.
• Pins: PIN, GND

ESP8266 NodeMCU

• Description: A low-cost Wi-Fi microchip with full TCP/IP stack and microcontroller capability.
• Pins: D0, D1, D2, D3, D4, 3V3, GND, D5, D6, D7, D8, RX, TX, A0, RSV, SD3, SD2, SD1, CMD, SD0, CLK, EN, RST, VIN

16x2 I2C LCD

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

RFID-RC522

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

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

Wiring Details

Resistor (100 Ohms)

• pin1 connected to Arduino UNO D2
• pin2 connected to Buzzer PIN

Resistor (330 Ohms)

• pin1 connected to Arduino UNO D6
• pin2 connected to LED: Two Pin (green) anode

Resistor (330 Ohms)

• pin1 connected to Arduino UNO D3
• pin2 connected to LED: Two Pin (red) anode

LED: Two Pin (red)

• cathode connected to GND
• anode connected to Resistor pin2

LED: Two Pin (green)

• cathode connected to GND
• anode connected to Resistor pin2

Buzzer

• PIN connected to Resistor pin2
• GND connected to GND

ESP8266 NodeMCU

• 3V3 connected to Arduino UNO 3.3V
• GND connected to GND
• D5 connected to Arduino UNO D13
• D6 connected to Arduino UNO D12
• D7 connected to Arduino UNO D11
• D4 connected to Arduino UNO D10
• D3 connected to Arduino UNO D9
• D1 connected to Arduino UNO D8
• D2 connected to Arduino UNO D7

16x2 I2C LCD

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

RFID-RC522

• VCC (3.3V) connected to Arduino UNO 3.3V
• GND connected to GND
• SCK connected to ESP8266 NodeMCU D5
• MISO connected to ESP8266 NodeMCU D6
• MOSI connected to ESP8266 NodeMCU D7
• SDA connected to ESP8266 NodeMCU D4
• RST connected to ESP8266 NodeMCU D3

Arduino UNO

• 3.3V connected to ESP8266 NodeMCU 3V3
• 5V connected to 16x2 I2C LCD VCC
• GND connected to GND
• D2 connected to Resistor pin1
• D3 connected to Resistor pin1
• D6 connected to Resistor pin1
• D7 connected to ESP8266 NodeMCU D2
• D8 connected to ESP8266 NodeMCU D1
• D9 connected to ESP8266 NodeMCU D3
• D10 connected to ESP8266 NodeMCU D4
• D11 connected to ESP8266 NodeMCU D7
• D12 connected to ESP8266 NodeMCU D6
• D13 connected to ESP8266 NodeMCU D5
• A4 connected to 16x2 I2C LCD SDA
• A5 connected to 16x2 I2C LCD SCL

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)