As the pin resources of controller is limited, your project may be not able to use normal LCD shield after connected with a certain quantity of sensors or SD card. However, with this I2C interface module, you will be able to realize data display via only 2 wires. If you already has I2C devices in your project, this LCD module actually cost no more resources at all. It is fantastic based project. Specification: I2C Address: 0x27 Supply voltage: 5V the backlight and contrast is adjusted by potentiometer Come with 2 IIC interface, which can be connected by Dupont Line or IIC dedicated cable Compatible for 1602 LCD As the pin resources of controller is limited, your project may be not able to use normal LCD shield after connected with a certain quantity of sensors or SD card. However, with this I2C interface module, you will be able to realize data display via only 2 wires. If you already has I2C devices in your project, this LCD module actually cost no more resources at all. It is fantastic based project. Specification: I2C Address: 0x27 Supply voltage: 5V the backlight and contrast is adjusted by potentiometer Come with 2 IIC interface, which can be connected by Dupont Line or IIC dedicated cable Compatible for 1602 LCD As the pin resources of controller is limited, your project may be not able to use normal LCD shield after connected with a certain quantity of sensors or SD card. However, with this I2C interface module, you will be able to realize data display via only 2 wires. If you already has I2C devices in your project, this LCD module actually cost no more resources at all. It is fantastic based project. Specification: I2C Address: 0x27 Supply voltage: 5V the backlight and contrast is adjusted by potentiometer Come with 2 IIC interface, which can be connected by Dupont Line or IIC dedicated cable Compatible for 1602 LCD polybag