Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed to interface various components with an Arduino UNO microcontroller. The circuit includes sensors, a display, communication modules, a relay, a buzzer, a servo, and power management components. The Arduino UNO serves as the central processing unit, controlling the peripherals and managing data communication.

Component List

Arduino UNO

• Microcontroller board based on the ATmega328P
• It has 14 digital input/output pins, 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header, and a reset button.

Buzzer

• An electromechanical component that produces sound
• Typically used for audible alerts or alarms.

MQ-4 Gas Sensor

• A gas sensor designed for detecting natural gas and methane levels in the air
• It has both analog and digital output capabilities.

Resistor (10 Ohms)

• A passive two-terminal electrical component that implements electrical resistance as a circuit element.

Temperature Sensor (LM35)

• An analog temperature sensor that provides a voltage output proportional to the ambient temperature.

SIM800L GSM Module

• A compact GSM/GPRS module for mobile communication and SMS services.

1 Channel 5V Relay Module

• An electrically operated switch that allows you to control a high power circuit with a low power signal.

Fan

• An electric device that creates airflow by rotating blades.

Mosfet

• A type of field-effect transistor used for switching and amplifying electronic signals.

5V Battery

• A power source providing a 5V output, typically used for portable electronics.

Rocker Switch

• A switch that rocks back and forth when pressed, with one side of the switch raised while the other side is depressed.

I2C LCD 16x2 Screen

• A liquid crystal display capable of displaying 16 characters per line, with 2 lines, and uses the I2C communication protocol.

Servo

• A rotary actuator or linear actuator that allows for precise control of angular or linear position, velocity, and acceleration.

ESP8266 ESP-01 WiFi Module

• A self-contained SOC with integrated TCP/IP protocol stack that can give any microcontroller access to a WiFi network.

Wiring Details

Arduino UNO

• 3.3V connected to ESP8266 ESP-01 WiFi Module (VCC and CH_PD)
• 5V connected to Servo (VCC), MQ-4 (VCC), I2C LCD 16x2 Screen (VCC), Fan (5V), SIM800L (VCC)
• GND connected to Mosfet (Source), Servo (GND), Buzzer (GND), MQ-4 (GND), Temperature Sensor (LM35) (+Vs), Rocker Switch (output), SIM800L (GND)
• Vin connected to 5V Battery (positive), 1 Channel 5V Relay Module (VCC+)
• A0 connected to MQ-4 (A0)
• A1 connected to Temperature Sensor (LM35) (Vout)
• A4 connected to I2C LCD 16x2 Screen (SDA)
• A5 connected to I2C LCD 16x2 Screen (SCL)
• D2 connected to ESP8266 ESP-01 WiFi Module (TXD), 1 Channel 5V Relay Module (IN), SIM800L (TXD)
• D3 connected to ESP8266 ESP-01 WiFi Module (RXD), SIM800L (RXD)
• D4 connected to SIM800L (RST)
• D8 connected to Buzzer (PIN)
• D9 connected to Servo (PWM)
• D10 connected to Resistor (pin1)

Buzzer

• PIN connected to Arduino UNO (D8)
• GND connected to Arduino UNO (GND)

MQ-4 Gas Sensor

• A0 connected to Arduino UNO (A0)
• D0 not connected
• GND connected to Arduino UNO (GND)
• VCC connected to Arduino UNO (5V)

Resistor (10 Ohms)

• pin1 connected to Arduino UNO (D10)
• pin2 connected to Mosfet (Gate)

Temperature Sensor (LM35)

• +Vs connected to Arduino UNO (GND)
• Vout connected to Arduino UNO (A1)
• GND connected to Arduino UNO (GND)

SIM800L GSM Module

• VCC connected to Arduino UNO (5V)
• GND connected to Arduino UNO (GND)
• RST connected to Arduino UNO (D4)
• RXD connected to Arduino UNO (D3)
• TXD connected to Arduino UNO (D2)

1 Channel 5V Relay Module

• VCC+ connected to 5V Battery (positive)
• VCC- (GND) connected to Arduino UNO (GND)
• IN connected to Arduino UNO (D2)

Fan

• 5V connected to Arduino UNO (5V)
• GND connected to Mosfet (Drain)

Mosfet

• Gate connected to Resistor (pin2)
• Drain connected to Fan (GND)
• Source connected to Arduino UNO (GND)

5V Battery

• positive connected to 1 Channel 5V Relay Module (VCC+), Arduino UNO (Vin)
• negative connected to Rocker Switch (input)

Rocker Switch

• output connected to Arduino UNO (GND)
• input connected to 5V Battery (negative)

I2C LCD 16x2 Screen

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

Servo

• VCC connected to Arduino UNO (5V)
• GND connected to Arduino UNO (GND)
• PWM connected to Arduino UNO (D9)

ESP8266 ESP-01 WiFi Module

• CH_PD connected to Arduino UNO (3.3V)
• VCC connected to Arduino UNO (3.3V)
• GND connected to Arduino UNO (GND)
• RXD connected to Arduino UNO (D3)
• TXD connected to Arduino UNO (D2)

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:

}

Additional Notes

• The provided code is a template and does not contain any functional code specific to the circuit's operation.
• The user is expected to write the setup and loop functions to initialize the components and define the circuit's behavior during operation.