Circuit Documentation

Summary

This circuit involves an Arduino UNO microcontroller interfacing with multiple pushbuttons, an RFID module, and a 16x2 I2C LCD display. The pushbuttons are used as input devices, the RFID module is used for reading RFID tags, and the LCD display is used for visual output. The Arduino UNO serves as the central controller, processing inputs and controlling outputs.

Component List

Pushbutton

• Description: A simple pushbutton switch.
• Pins: Pin 1, Pin 2, Pin 3, Pin 4

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

EM-18 RFID Module

• Description: An RFID reader module.
• Pins: TX, VCC, GND

16x2 I2C LCD

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

Comment

• Description: Placeholder for comments in the circuit.
• Pins: None

Wiring Details

Pushbutton 1

• Pin 2: Connected to GND
• Pin 3: Connected to Arduino UNO D6

Pushbutton 2

• Pin 2: Connected to GND
• Pin 1: Connected to Arduino UNO D7

Pushbutton 3

• Pin 2: Connected to GND
• Pin 3: Connected to Arduino UNO D8

Pushbutton 4

• Pin 2: Connected to GND
• Pin 3: Connected to Arduino UNO D9

Arduino UNO

• GND: Connected to GND of Pushbutton 1, Pushbutton 2, Pushbutton 3, Pushbutton 4, 16x2 I2C LCD, and EM-18 RFID Module
• D6: Connected to Pin 3 of Pushbutton 1
• D7: Connected to Pin 1 of Pushbutton 2
• D8: Connected to Pin 3 of Pushbutton 3
• D9: Connected to Pin 3 of Pushbutton 4
• 5V: Connected to VCC of 16x2 I2C LCD and EM-18 RFID Module
• A4: Connected to SDA of 16x2 I2C LCD
• A5: Connected to SCL of 16x2 I2C LCD
• D2: Connected to TX of EM-18 RFID Module

EM-18 RFID Module

• TX: Connected to Arduino UNO D2
• VCC: Connected to Arduino UNO 5V
• GND: Connected to GND

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

Code Documentation

Arduino UNO Code

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

}

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

}

This code is a basic template for the Arduino UNO. The setup() function is where you initialize your components and settings, and the loop() function is where the main logic of your program runs repeatedly.

Additional Documentation

This section is reserved for any additional documentation or comments related to the code or circuit.