Circuit Documentation

Summary

This circuit is a comprehensive home automation system that integrates various sensors, actuators, and communication modules. It includes an Arduino UNO microcontroller, an LCD display, a Bluetooth module, an IR receiver, a temperature sensor, a soil moisture sensor, a gas sensor, a piezo buzzer, a red LED, a membrane keypad, a relay module, and a rocker switch. The system is designed to monitor environmental conditions and control devices based on sensor inputs and user commands.

Component List

LED: Two Pin (red)

• Description: A red LED used for visual indication.
• Pins: Cathode, Anode

16x2 I2C LCD

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

HC-05 Bluetooth Module

• Description: A Bluetooth module for wireless communication.
• Pins: Key, VCC, TXD, RXD, State, GND

Rocker Switch

• Description: A simple on/off switch.
• Pins: 1, 2

VS1838B IR Receiver

• Description: An IR receiver module for remote control.
• Pins: OUT, GND, VCC

Temperature Sensor (LM35)

• Description: A temperature sensor that provides an analog output proportional to the temperature.
• Pins: +Vs, Vout, GND

MQ-2

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

220V Fan

• Description: A fan operating at 220V AC.
• Pins: N, L

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

Membrane Matrix Keypad

• Description: A 4x3 matrix keypad for user input.
• Pins: Row 1, Row 2, Row 3, Row 4, Column 1, Column 2, Column 3

Piezo Buzzer

• Description: A buzzer for audio alerts.
• Pins: Pin 1, Pin 2

Red Light 220VAC

• Description: A red indicator light operating at 220V AC.
• Pins: -, +

240V Power Source

• Description: A power source providing 240V AC.
• Pins: Live, Neutral

2 Channel Relay Module

• Description: A relay module with two channels for switching high voltage devices.
• Pins: N.O. 2, COM 2, N.C. 2, N.O. 1, COM 1, N.C. 1, Pin 7, Pin 8, Pin 9, Pin 10, Pin 11, Pin 12, VCC+, VCC- (GND), IN 1, IN 2

SparkFun Soil Moisture Sensor

• Description: A sensor for measuring soil moisture levels.
• Pins: VCC, GND, SIG

Wiring Details

LED: Two Pin (red)

• Cathode: Connected to GND (Arduino UNO)
• Anode: Connected to Pin 2 of Piezo Buzzer and D13 (Arduino UNO)

16x2 I2C LCD

• GND: Connected to GND (common ground)
• VCC: Connected to 5V (common power)
• SDA: Connected to SDA (Arduino UNO)
• SCL: Connected to SCL (Arduino UNO)

HC-05 Bluetooth Module

• VCC: Connected to 5V (common power)
• GND: Connected to GND (common ground)
• TXD: Connected to D2 (Arduino UNO)
• RXD: Connected to D3 (Arduino UNO)

Rocker Switch

• Pin 1: Connected to D4 (Arduino UNO)
• Pin 2: Connected to GND (common ground)

Rocker Switch

• Pin 1: Connected to D5 (Arduino UNO)
• Pin 2: Connected to GND (common ground)

VS1838B IR Receiver

• OUT: Connected to A0 (Arduino UNO)
• GND: Connected to GND (common ground)
• VCC: Connected to 5V (common power)

Temperature Sensor (LM35)

• +Vs: Connected to 5V (common power)
• Vout: Connected to A1 (Arduino UNO)
• GND: Connected to GND (common ground)

MQ-2

• GND: Connected to GND (common ground)
• VCC: Connected to 5V (common power)
• ANALOG: Connected to A3 (Arduino UNO)

220V Fan

• N: Connected to Neutral (240V Power Source)
• L: Connected to N.C. 1 (2 Channel Relay Module)

Arduino UNO

• 5V: Connected to 5V (common power)
• GND: Connected to GND (common ground)
• A0: Connected to OUT (VS1838B IR Receiver)
• A1: Connected to Vout (Temperature Sensor)
• A2: Connected to SIG (SparkFun Soil Moisture Sensor)
• A3: Connected to ANALOG (MQ-2)
• SCL: Connected to SCL (16x2 I2C LCD)
• SDA: Connected to SDA (16x2 I2C LCD)
• D13: Connected to Anode (LED: Two Pin (red))
• D12: Connected to Row 1 (Membrane Matrix Keypad)
• D11: Connected to Row 2 (Membrane Matrix Keypad)
• D10: Connected to Row 3 (Membrane Matrix Keypad)
• D9: Connected to Row 4 (Membrane Matrix Keypad)
• D8: Connected to Column 1 (Membrane Matrix Keypad)
• D7: Connected to Column 2 (Membrane Matrix Keypad)
• D6: Connected to Column 3 (Membrane Matrix Keypad)
• D5: Connected to Pin 1 (Rocker Switch)
• D4: Connected to Pin 1 (Rocker Switch)
• D3: Connected to RXD (HC-05 Bluetooth Module)
• D2: Connected to TXD (HC-05 Bluetooth Module)
• D1: Connected to IN 2 (2 Channel Relay Module)
• D0: Connected to IN 1 (2 Channel Relay Module)

Membrane Matrix Keypad

• Row 1: Connected to D12 (Arduino UNO)
• Row 2: Connected to D11 (Arduino UNO)
• Row 3: Connected to D10 (Arduino UNO)
• Row 4: Connected to D9 (Arduino UNO)
• Column 1: Connected to D8 (Arduino UNO)
• Column 2: Connected to D7 (Arduino UNO)
• Column 3: Connected to D6 (Arduino UNO)

Piezo Buzzer

• Pin 1: Connected to Cathode (LED: Two Pin (red)) and GND (Arduino UNO)
• Pin 2: Connected to Anode (LED: Two Pin (red)) and D13 (Arduino UNO)

Red Light 220VAC

• -: Connected to Neutral (240V Power Source)
• +: Connected to N.C. 2 (2 Channel Relay Module)

240V Power Source

• Live: Connected to COM 1 and COM 2 (2 Channel Relay Module)
• Neutral: Connected to - (Red Light 220VAC) and N (220V Fan)

2 Channel Relay Module

• VCC+: Connected to 5V (common power)
• VCC- (GND): Connected to GND (common ground)
• IN 1: Connected to D0 (Arduino UNO)
• IN 2: Connected to D1 (Arduino UNO)
• COM 1: Connected to Live (240V Power Source)
• COM 2: Connected to Live (240V Power Source)
• N.C. 1: Connected to L (220V Fan)
• N.C. 2: Connected to + (Red Light 220VAC)

SparkFun Soil Moisture Sensor

• VCC: Connected to 5V (common power)
• GND: Connected to GND (common ground)
• SIG: Connected to A2 (Arduino UNO)

Code Documentation

int Buzzer = 13;
int Thres = 90;
int val;
int SensorPin = A2;
int limit = 500;
int output;

#include <Keypad.h>
#include <Adafruit_Liquid