Circuit Documentation

Summary

This document provides a detailed overview of a circuit that integrates various sensors and microcontrollers. The circuit includes an ESP8266 NodeMCU, an Arduino UNO, and several sensors such as the MQ-9 gas sensor, BME/BMP280, BH1750 light sensor, and a water level sensor. The ESP8266 NodeMCU and Arduino UNO are interconnected and communicate with the sensors to collect and process data.

Component List

ESP8266 NodeMCU

• Description: A low-cost Wi-Fi microcontroller with GPIO, ADC, and other features.
• Pins: D0, D1, D2, D3, D4, 3V3, GND, D5, D6, D7, D8, RX, TX, A0, RSV, SD3, SD2, SD1, CMD, SD0, CLK, EN, RST, VIN

Arduino UNO

• Description: A popular 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

MQ-9 Breakout

• Description: A gas sensor module that detects carbon monoxide and other gases.
• Pins: VCC, GND, DO, AO

BME/BMP280

• Description: A sensor module that measures temperature, humidity, and pressure.
• Pins: GND, SCL, SDA, VIN

BH1750

• Description: A digital light sensor module.
• Pins: VCC, GND, SCL, SDA, ADDR

Water Level Sensor

• Description: A sensor module that detects water levels.
• Pins: SIG, VCC, GND

Resistor

• Description: A 10k Ohm resistor.
• Pins: pin1, pin2
• Properties: Resistance: 10k Ohms

Wiring Details

ESP8266 NodeMCU

• D1 connected to BH1750 SCL and BME/BMP280 SCL
• D2 connected to BH1750 SDA and BME/BMP280 SDA
• D6 connected to Resistor pin2
• D7 connected to Arduino UNO D0
• GND connected to BH1750 GND, BME/BMP280 GND, MQ-9 Breakout GND, Arduino UNO GND, and Water Level Sensor GND
• 3V3 connected to BH1750 VCC and BME/BMP280 VIN
• VIN connected to Arduino UNO 5V

Arduino UNO

• D0 connected to ESP8266 NodeMCU D7
• GND connected to ESP8266 NodeMCU GND, MQ-9 Breakout GND, and Water Level Sensor GND
• 5V connected to ESP8266 NodeMCU VIN
• A0 connected to Water Level Sensor SIG
• A1 connected to MQ-9 Breakout AO
• D3 connected to MQ-9 Breakout VCC
• D2 connected to Water Level Sensor VCC
• D1 connected to Resistor pin1

MQ-9 Breakout

• GND connected to ESP8266 NodeMCU GND and Arduino UNO GND
• AO connected to Arduino UNO A1
• VCC connected to Arduino UNO D3

BME/BMP280

• GND connected to ESP8266 NodeMCU GND
• SCL connected to ESP8266 NodeMCU D1
• SDA connected to ESP8266 NodeMCU D2
• VIN connected to ESP8266 NodeMCU 3V3

BH1750

• GND connected to ESP8266 NodeMCU GND
• SCL connected to ESP8266 NodeMCU D1
• SDA connected to ESP8266 NodeMCU D2
• VCC connected to ESP8266 NodeMCU 3V3

Water Level Sensor

• GND connected to ESP8266 NodeMCU GND and Arduino UNO GND
• SIG connected to Arduino UNO A0
• VCC connected to Arduino UNO D2

Resistor

• pin1 connected to Arduino UNO D1
• pin2 connected to ESP8266 NodeMCU D6

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)

This document provides a comprehensive overview of the circuit, including the components used, their connections, and the code running on the microcontrollers.