In this lesson, the BMP390 is explained, with wiring shown for I2C and SPI. Then, it shows how to display barometric pressure, temperature, and approximate altitude on the serial monitor, on an LCD1602, and on an LCD2004. A full wiring diagram is shown. Library installation is shown, and approximate altitude is measured on the first floor and compared with the altitude on the 25th floor. The code is fully explained and demonstrated using an Arduino UNO and an Arduino MEGA.

This code is for an LCD2004 with I2C, which has only 4 wires.