Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an Arduino Nano, a LoRa Ra-02 SX1278 module, an XL6015 buck converter, a 12V battery, a green LED, an MQ-2 gas sensor, and a resistor. The circuit is designed to interface the Arduino Nano with the LoRa module for wireless communication, power the system using a 12V battery, and include a gas sensor and an LED indicator.

Component List

Arduino Nano

• Description: A small, complete, and breadboard-friendly board based on the ATmega328P.
• Pins: D1/TX, D0/RX, RESET, GND, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11/MOSI, D12/MISO, VIN, 5V, A7, A6, A5, A4, A3, A2, A1, A0, AREF, 3V3, D13/SCK

LoRa Ra-02 SX1278

• Description: A wireless communication module based on the SX1278 chip.
• Pins: GND, NSS, MOSI, MISO, SCK, D105, DI04, 3.3V, RST, DI00, DI01, D102, DI03

XL6015 Buck Converter

• Description: A DC-DC buck converter for stepping down voltage.
• Pins: INPUT -, INPUT +, OUTPUT +, OUTPUT -

Battery 12V

• Description: A 12V battery for powering the circuit.
• Pins: +, -

LED: Two Pin (green)

• Description: A green LED for visual indication.
• Pins: cathode, anode

MQ-2 Gas Sensor

• Description: A gas sensor for detecting various gases.
• Pins: GND, VCC, ANALOG, Digital

Resistor

• Description: A resistor with a resistance of 200 Ohms.
• Pins: pin1, pin2

Wiring Details

Arduino Nano

• GND is connected to:

  • GND of LoRa Ra-02 SX1278
  • OUTPUT - of XL6015 Buck Converter
  • GND of MQ-2 Gas Sensor

• D6 is connected to the cathode of the green LED.

• D8 is connected to DI00 of LoRa Ra-02 SX1278.

• D9 is connected to RST of LoRa Ra-02 SX1278.

• D10 is connected to NSS of LoRa Ra-02 SX1278.

• D11/MOSI is connected to MOSI of LoRa Ra-02 SX1278.

• D12/MISO is connected to MISO of LoRa Ra-02 SX1278.

• VIN is connected to OUTPUT + of XL6015 Buck Converter and pin2 of the resistor.

• 5V is connected to VCC of MQ-2 Gas Sensor.

• A0 is connected to ANALOG of MQ-2 Gas Sensor.

• 3V3 is connected to 3.3V of LoRa Ra-02 SX1278.

• D13/SCK is connected to SCK of LoRa Ra-02 SX1278.

LoRa Ra-02 SX1278

• GND is connected to GND of Arduino Nano and OUTPUT - of XL6015 Buck Converter.

• DI00 is connected to D8 of Arduino Nano.

• RST is connected to D9 of Arduino Nano.

• NSS is connected to D10 of Arduino Nano.

• MOSI is connected to D11/MOSI of Arduino Nano.

• MISO is connected to D12/MISO of Arduino Nano.

• 3.3V is connected to 3V3 of Arduino Nano.

• SCK is connected to D13/SCK of Arduino Nano.

XL6015 Buck Converter

• OUTPUT - is connected to GND of Arduino Nano and GND of LoRa Ra-02 SX1278.

• OUTPUT + is connected to VIN of Arduino Nano and pin2 of the resistor.

• INPUT - is connected to - of the 12V battery.

• INPUT + is connected to + of the 12V battery.

Battery 12V

• - is connected to INPUT - of XL6015 Buck Converter.

• + is connected to INPUT + of XL6015 Buck Converter.

LED: Two Pin (green)

• cathode is connected to D6 of Arduino Nano.

• anode is connected to pin1 of the resistor.

MQ-2 Gas Sensor

• GND is connected to GND of Arduino Nano.

• VCC is connected to 5V of Arduino Nano.

• ANALOG is connected to A0 of Arduino Nano.

Resistor

• pin1 is connected to the anode of the green LED.

• pin2 is connected to OUTPUT + of XL6015 Buck Converter and VIN of Arduino Nano.

Documented Code

Arduino Nano 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 a summary, component list, wiring details, and documented code.