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.

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/