Mihaela Florescu - AAC

The scope of this project is to create an air quality monitoring system using an ESP32 board and a BMP180 sensor. This system will check some environmental parameters such as temperature, pressure, altitude and humidity. These values read by the sensor will be send to a web page.

In order to develop this project, the following components have been used: ESP32 MCU, BMP180 sensor, breadboard and jumper wires.

• ESP32 is a low-power system on a chip microcontroller with integrated Wi-Fi and dual-mode Bluetooth.
• BMP180 is ideal for measuring temperature, pressure, altitude and humidity.

In order to connect the sensor to the ESP32 board, the following pins need to be linked:

• VIN pin of BMP180 must be connected to VIN pin of ESP32
• GND pin of BMP180 must be connected to any GND pin of ESP32
• SDA pin of BMP180 must be connected to GPIO 21 of ESP32 (which is marked as P21 on the board)
• SCL pin of BMP180 must be connected to GPIO 22 of ESP32 (which is marked as P22 on the board)

The software part of this project is divided in 2 main functions:

• setup() function - code from here is executed once. In this part of the code, the following functions are called:
  1. initWifi() - this method initializes the WiFi connection and returns the IP Address where the web page is localed.

 void initWifi()
{
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi ..");
  while (WiFi.status() != WL_CONNECTED)
  {
    Serial.print('.');
    delay(1000);
  }
  Serial.println(WiFi.localIP());
} 

1. initBME() - this method initializes the BMP180 sensor

 void initBmp()
{
  if (!bmp.begin()) 
  {
    Serial.println("BMP180 sensor not found");
  }
} 

• loop() function - code from here is executed forever, in a loop. In this part of the code, the web page is created and the environmental parameters are read.

For the development of this project, the following libraries have been used:

• Wifi.h - it is used to connect to Wifi and create the web page
• Adafruit_BMP085.h - it is used to initialise the BMP180 sensor and read the temperature, pressure, humidity parameters. For reading these parameters, the following methods from this library have been used: readTemperature(), readPresure(), readHumidity.

In conclusion, the scope of this project was to create an air quality monitoring system, by reading some environment parameters such as temperature, pressure, altitude, humidity and send them to a web page.

https://randomnerdtutorials.com/esp32-with-bmp180-barometric-sensor/ https://randomnerdtutorials.com/esp32-web-server-arduino-ide/