Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an Arduino UNO as the central microcontroller, interfaced with various sensors and modules including the Adafruit BMP180 barometric pressure sensor, ESP-01 WiFi module, a photocell (LDR), a DHT03 humidity and temperature sensor, an MQ-4 methane gas sensor, and a 16x2 LCD screen with I2C interface. The circuit is powered by an MB102 Breadboard Power Supply Module capable of providing both 3.3V and 5V outputs. A resistor is also included in the circuit for the photocell voltage divider.

Component List

Arduino UNO

• Microcontroller board based on the ATmega328P
• Features digital I/O pins, analog input pins, and various power pins

Adafruit BMP180

• Barometric pressure sensor
• Capable of measuring temperature as well
• Interfaces via I2C

ESP-01

• WiFi module based on the ESP8266
• Provides wireless connectivity to the circuit

Resistor

• Passive component used to limit current or divide voltages
• 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 regulated 3.3V and 5V to the breadboard

LCD screen 16x2 I2C

• Alphanumeric liquid crystal display
• 16 characters by 2 lines
• I2C interface for communication

Humidity and Temperature Sensor (DHT03)

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

MQ-4

• Methane gas sensor
• Analog and digital outputs

Wiring Details

Arduino UNO

• 5V connected to sensors and modules requiring 5V
• GND connected to common ground
• A0 connected to DHT03 data signal
• A1 connected to photocell (LDR)
• A2 connected to MQ-4 analog output
• A4 (SDA) connected to I2C data line
• A5 (SCL) connected to I2C clock line
• D10 connected to ESP-01 TX
• D11 connected to ESP-01 RX

Adafruit BMP180

• SDA and SCL connected to I2C bus
• +3V3 and GND connected to 3.3V and ground from the power supply module

ESP-01

• RX connected to Arduino D11
• TX connected to Arduino D10
• VCC and CH_PD connected to 3.3V
• GND connected to common ground

Resistor (10k Ohms)

• One end connected to photocell (LDR) and Arduino A1
• Other end connected to common ground

Photocell (LDR)

• One end connected to 5V through a dot (junction point)
• Other end connected to Arduino A1 through a 10k Ohm resistor

MB102 Breadboard Power Supply Module 3.3V/5V

• 5v output connected to 5V sensors and Arduino 5V
• 3.3V output connected to 3.3V sensors and ESP-01
• GND connected to common ground

LCD screen 16x2 I2C

• SDA and SCL connected to I2C bus
• VCC connected to 5V
• GND connected to common ground

Humidity and Temperature Sensor (DHT03)

• Vcc connected to 5V
• Data-signal connected to Arduino A0
• GND 1 connected to common ground

MQ-4

• A0 connected to Arduino A2
• D0 not connected in this circuit
• VCC connected to 5V
• GND connected to common ground

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:

}

Note: The provided code is a template and does not include specific functionality. It needs to be populated with the setup and loop code to initialize and control the connected sensors and modules.