Arduino Nano and SIM800L GSM-Based Remote Monitoring System with LoRa and Battery Power
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Circuit Documentation
Summary
This document provides a detailed overview of a circuit that integrates various components including an Arduino Nano, SIM 800L GSM module, LoRa Ra-02 SX1278, MQ-2 gas sensor, and other supporting components. The circuit is designed to perform specific tasks as defined by the embedded code running on the Arduino Nano.
Component List
Electrolytic Capacitor
- Description: A capacitor used to store electrical energy.
- Pins: -, +
- Properties:
- Capacitance: 0.000001 Farads
Battery 12V
- Description: A 12V battery used as the power source.
- Pins: +, -
SIM 800L V2.0 GSM
- Description: A GSM module used for communication.
- Pins: SIM_TXD, VDD, SIM.RXD, 5V/4V, GND, RST
Arduino Nano
- Description: A microcontroller board based on the ATmega328.
- 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
MQ-2
- Description: A gas sensor used to detect gas levels.
- Pins: GND, VCC, ANALOG, Digital
Regulator Stepdown DC XL4015 CC CV
- Description: A step-down voltage regulator.
- Pins: IN +, IN -, OUT +, OUT -
Relay Module 5V-30V
- Description: A relay module used to control high voltage devices.
- Pins: common contact, normally open, normally closed, trigger, V-, V+
Siren
- Description: A siren used for alerting.
- Pins: Positive, Ground
Resistor
- Description: A resistor used to limit current.
- Pins: pin1, pin2
- Properties:
- Resistance: 200 Ohms
LED: Two Pin (green)
- Description: A green LED used for indication.
- Pins: cathode, anode
LoRa Ra-02 SX1278
- Description: A LoRa module used for long-range communication.
- Pins: GND, NSS, MOSI, MISO, SCK, D105, DI04, 3.3V, RST, DI00, DI01, D102, DI03
Wiring Details
Electrolytic Capacitor
- Pin + is connected to:
- Regulator Stepdown DC XL4015 CC CV (OUT +)
- Arduino Nano (VIN)
- SIM 800L V2.0 GSM (5V/4V)
- Pin - is connected to:
- LoRa Ra-02 SX1278 (GND)
- Regulator Stepdown DC XL4015 CC CV (OUT -)
- Arduino Nano (GND)
- Resistor (pin2)
- SIM 800L V2.0 GSM (GND)
Battery 12V
- Pin + is connected to:
- Regulator Stepdown DC XL4015 CC CV (IN +)
- Relay Module 5V-30V (V+)
- Pin - is connected to:
- Regulator Stepdown DC XL4015 CC CV (IN -)
- Relay Module 5V-30V (V-)
SIM 800L V2.0 GSM
- Pin SIM_TXD is connected to:
- Arduino Nano (D2)
- Pin SIM.RXD is connected to:
- Arduino Nano (D3)
- Pin 5V/4V is connected to:
- Regulator Stepdown DC XL4015 CC CV (OUT +)
- Arduino Nano (VIN)
- Electrolytic Capacitor (+)
- Pin GND is connected to:
- LoRa Ra-02 SX1278 (GND)
- Regulator Stepdown DC XL4015 CC CV (OUT -)
- Arduino Nano (GND)
- Resistor (pin2)
- Electrolytic Capacitor (-)
Arduino Nano
- Pin D2 is connected to:
- SIM 800L V2.0 GSM (SIM_TXD)
- Pin D3 is connected to:
- SIM 800L V2.0 GSM (SIM.RXD)
- Pin VIN is connected to:
- Regulator Stepdown DC XL4015 CC CV (OUT +)
- SIM 800L V2.0 GSM (5V/4V)
- Electrolytic Capacitor (+)
- Pin GND is connected to:
- LoRa Ra-02 SX1278 (GND)
- Regulator Stepdown DC XL4015 CC CV (OUT -)
- Resistor (pin2)
- SIM 800L V2.0 GSM (GND)
- Electrolytic Capacitor (-)
- Pin D7 is connected to:
- Relay Module 5V-30V (trigger)
- Pin D8 is connected to:
- LoRa Ra-02 SX1278 (DI00)
- Pin D9 is connected to:
- LoRa Ra-02 SX1278 (RST)
- Pin D10 is connected to:
- LoRa Ra-02 SX1278 (NSS)
- Pin D11/MOSI is connected to:
- LoRa Ra-02 SX1278 (MOSI)
- Pin D12/MISO is connected to:
- LoRa Ra-02 SX1278 (MISO)
- Pin 5V is connected to:
- MQ-2 (VCC)
- Pin A4 is connected to:
- LED: Two Pin (green) (cathode)
- Pin A3 is connected to:
- LED: Two Pin (green) (cathode)
- Pin A2 is connected to:
- LED: Two Pin (green) (cathode)
- Pin A0 is connected to:
- MQ-2 (ANALOG)
- Pin 3V3 is connected to:
- LoRa Ra-02 SX1278 (3.3V)
- Pin D13/SCK is connected to:
- LoRa Ra-02 SX1278 (SCK)
MQ-2
- Pin GND is connected to:
- Arduino Nano (GND)
- Pin VCC is connected to:
- Arduino Nano (5V)
- Pin ANALOG is connected to:
- Arduino Nano (A0)
Regulator Stepdown DC XL4015 CC CV
- Pin IN + is connected to:
- Battery 12V (+)
- Relay Module 5V-30V (V+)
- Pin IN - is connected to:
- Battery 12V (-)
- Relay Module 5V-30V (V-)
- Pin OUT + is connected to:
- Arduino Nano (VIN)
- SIM 800L V2.0 GSM (5V/4V)
- Electrolytic Capacitor (+)
- Pin OUT - is connected to:
- LoRa Ra-02 SX1278 (GND)
- Arduino Nano (GND)
- Resistor (pin2)
- SIM 800L V2.0 GSM (GND)
- Electrolytic Capacitor (-)
Relay Module 5V-30V
- Pin common contact is connected to:
- Siren (Ground)
- Pin normally open is connected to:
- Siren (Positive)
- Pin trigger is connected to:
- Arduino Nano (D7)
- Pin V+ is connected to:
- Battery 12V (+)
- Regulator Stepdown DC XL4015 CC CV (IN +)
- Pin V- is connected to:
- Battery 12V (-)
- Regulator Stepdown DC XL4015 CC CV (IN -)
Siren
- Pin Positive is connected to:
- Relay Module 5V-30V (normally open)
- Pin Ground is connected to:
- Relay Module 5V-30V (common contact)
Resistor
- Pin pin1 is connected to:
- LED: Two Pin (green) (anode)
- Pin pin2 is connected to:
- LoRa Ra-02 SX1278 (GND)
- Regulator Stepdown DC XL4015 CC CV (OUT -)
- Arduino Nano (GND)
- SIM 800L V2.0 GSM (GND)
- Electrolytic Capacitor (-)
LED: Two Pin (green)
- Pin cathode is connected to:
- Arduino Nano (