Download Arduino Pinout I2C Images. The two pins which you need for the i2c communication are the following: I see on arduino uno there is twice sda and sdl:

My LCD Qapass with MH i2c does not display text. from www.alselectro.com

In this tutorial we will learn how the i2c communication protocol works and also we will make a practical example of it with the arduino board and a sensor which uses this protocol. We saw that arduino boards are programmed i2c is a communication protocol commonly referred to as the i2c bus. If you are not using an arduino uno, the sda and scl pins can be at a different location.

Lcd i2c uses i2c interface, so it has 4 pins

Maybe it is because many of the pinout diagrams for the nano have scl and sda on the wrong pins. Maybe it is because many of the pinout diagrams for the nano have scl and sda on the wrong pins. In this tutorial we will learn how the i2c communication protocol works and also we will make a practical example of it with the arduino board and a sensor which uses this protocol. Lcd i2c uses i2c interface, so it has 4 pins