Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an ESP32 microcontroller, a thermal printer, and a GM67 barcode reader module. The ESP32 serves as the central controller, interfacing with the thermal printer and barcode reader to perform various tasks. The document includes a component list, wiring details, and the embedded code used in the microcontroller.

Component List

ESP32 (30 pin)

• Description: A versatile microcontroller with built-in Wi-Fi and Bluetooth capabilities.
• Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, Vin, D23, D22, TX0, RX0, D21, D19, D18, D5, TX2, RX2, D4, D2, D15, 3V3

Thermal Printer

• Description: A thermal printer used for printing receipts or other small documents.
• Pins: RX, TX, +, -

GM67 Barcode Reader Module

• Description: A barcode reader module used for scanning and reading barcodes.
• Pins: 5V, GND, RX, TX

Comment

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

Wiring Details

ESP32 (30 pin)

• GND is connected to:

  • Thermal Printer (-)
  • GM67 Barcode Reader Module (GND)

• Vin is connected to:

  • Thermal Printer (+)
  • GM67 Barcode Reader Module (5V)

• D19 is connected to:

  • Thermal Printer (RX)

• D18 is connected to:

  • Thermal Printer (TX)

• TX2 is connected to:

  • GM67 Barcode Reader Module (RX)

• RX2 is connected to:

  • GM67 Barcode Reader Module (TX)

Thermal Printer

• - is connected to:

  • ESP32 (GND)

• + is connected to:

  • ESP32 (Vin)

• RX is connected to:

  • ESP32 (D19)

• TX is connected to:

  • ESP32 (D18)

GM67 Barcode Reader Module

• GND is connected to:

  • ESP32 (GND)

• 5V is connected to:

  • ESP32 (Vin)

• RX is connected to:

  • ESP32 (TX2)

• TX is connected to:

  • ESP32 (RX2)

Documented Code

ESP32 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)

This document provides a comprehensive overview of the circuit, including the components used, their connections, and the embedded code. This should serve as a useful reference for understanding and replicating the circuit.