{"id":50474,"date":"2019-05-06T09:06:02","date_gmt":"2019-05-06T09:06:02","guid":{"rendered":"http:\/\/randomnerdtutorials.com\/?p=50474"},"modified":"2019-05-06T10:15:52","modified_gmt":"2019-05-06T10:15:52","slug":"esp32-with-bmp180-barometric-sensor","status":"publish","type":"post","link":"https:\/\/randomnerdtutorials.com\/esp32-with-bmp180-barometric-sensor\/","title":{"rendered":"ESP32 with BMP180 Barometric Sensor – Guide"},"content":{"rendered":"\n

This guide shows you how to use the BMP180 barometric sensor with the ESP32 to read pressure, temperature and estimate altitude. We’ll show you how to wire the sensor to the ESP32, install the needed library, and how to write the sketch in the Arduino IDE.<\/p>\n\n\n\n

\"ESP32<\/figure><\/div>\n\n\n\n

Introducing the BMP180 Barometric Sensor<\/h2>\n\n\n\n

The BMP180 is a digital pressure sensor and it measures the absolute pressure of the air around it.<\/p>\n\n\n\n

\"BMP180<\/figure><\/div>\n\n\n\n

It features a measuring range from 300 to 1100hPa with an accuracy down to 0.02 hPa. <\/p>\n\n\n\n

Because temperature affects the pressure, the sensor comes with a temperature sensor to give temperature compensated pressure readings.<\/p>\n\n\n\n

Additionally, because the pressure changes with altitude, you can also estimate the altitude based on the current pressure measurement.<\/p>\n\n\n\n

Wiring BMP180 Sensor to the ESP32<\/h2>\n\n\n\n

The BMP180 barometric sensor uses I2C communication protocol. So, you need to use the SDA and SCL pins of the ESP32.<\/p>\n\n\n\n

The following table shows how to wire the sensor.<\/p>\n\n\n\n
BMP180<\/strong><\/td>Wiring to ESP32<\/strong><\/td><\/tr>
Vin<\/td>3.3V<\/span><\/td><\/tr>
GND<\/td>GND<\/span><\/td><\/tr>
SCL<\/td>GPIO 22<\/span> (SCL) <\/td><\/tr>
SDA<\/td>GPIO 21<\/span> (SDA) <\/td><\/tr><\/tbody><\/table>\n\n\n\n

Reading Temperature, Pressure, And Altitude<\/h2>\n\n\n\n

In this section we’ll show you how to read pressure and temperature from the BMP180 barometric sensor using the ESP32. We’ll also show you how to estimate altitude.<\/p>\n\n\n\n

Parts required<\/h3>\n\n\n\n

For this example, you need the following parts:<\/p>\n\n\n\n