Circuit Documentation

Summary of the Circuit

This circuit is designed to interface various sensors and modules with an Arduino UNO microcontroller. It includes a BMP180 barometric pressure sensor, an ESP-01 WiFi module, a photocell (LDR), a DHT03 humidity and temperature sensor, an MQ-4 methane gas sensor, and an LCD screen with I2C communication. The circuit is powered by an MB102 Breadboard Power Supply Module that provides both 3.3V and 5V outputs. A resistor is used in conjunction with the photocell to create a voltage divider for light intensity measurement. The Arduino UNO serves as the central processing unit, reading sensor data, and potentially sending data to the ESP-01 for WiFi communication.

Component List

Arduino UNO

• Microcontroller board based on the ATmega328P
• Provides digital and analog I/O pins
• Can be powered via USB or external power supply

Adafruit BMP180

• Barometric pressure sensor
• Can measure temperature as well
• Uses I2C communication

ESP-01

• WiFi module based on the ESP8266 chip
• Provides WiFi connectivity to the Arduino
• Communicates with the Arduino via serial (RX/TX)

Resistor

• Passive component used to limit current or divide voltage
• Resistance: 10,000 Ohms

Photocell (LDR)

• Light-dependent resistor
• Changes resistance based on the intensity of light

MB102 Breadboard Power Supply Module 3.3V/5V

• Provides both 3.3V and 5V outputs
• Powers the circuit components

LCD screen 16x2 I2C

• Alphanumeric liquid crystal display
• 16 characters by 2 lines
• Uses I2C communication for displaying data

Humidity and Temperature Sensor (DHT03)

• Measures ambient humidity and temperature
• Provides a digital signal output

MQ-4

• Methane gas sensor
• Provides both analog and digital outputs

Wiring Details

Arduino UNO

• 5V connected to the 5V power rail
• GND connected to the ground rail
• A0 connected to the DHT03 data signal
• A1 connected to one side of the photocell and to one side of the 10k resistor (forming a voltage divider)
• A2 connected to the MQ-4 analog output
• A4 (SDA) connected to the I2C data line
• A5 (SCL) connected to the I2C clock line
• D10 connected to the ESP-01 TX
• D11 connected to the ESP-01 RX

Adafruit BMP180

• +3V3 connected to the 3.3V power rail
• GND connected to the ground rail
• SCL connected to the I2C clock line
• SDA connected to the I2C data line

ESP-01

• VCC and CH_PD connected to the 3.3V power rail
• GND connected to the ground rail
• RX connected to Arduino UNO D11
• TX connected to Arduino UNO D10

Resistor

• One side connected to the photocell
• The other side connected to the ground rail

Photocell (LDR)

• One side connected to the 5V power rail
• The other side connected to one side of the 10k resistor and to Arduino UNO A1

MB102 Breadboard Power Supply Module 3.3V/5V

• 3.3V output connected to the 3.3V power rail
• 5v output connected to the 5V power rail
• GND connected to the ground rail

LCD screen 16x2 I2C

• VCC connected to the 5V power rail
• GND connected to the ground rail
• SCL connected to the I2C clock line
• SDA connected to the I2C data line

Humidity and Temperature Sensor (DHT03)

• Vcc connected to the 5V power rail
• Data-signal connected to Arduino UNO A0
• GND 1 connected to the ground rail

MQ-4

• VCC connected to the 5V power rail
• GND connected to the ground rail
• A0 connected to Arduino UNO A2

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 Documentation (documentation.txt)

No additional code documentation provided.