Arduino
Lcd
I2C
Normally, lcd can be connected with Arduino with many wires. With the I2C transfer module, we can use the I2C interface with only 4 wires to connect to your Arduino board.
You can find the library in the built-in Arduino libraries manerger or use the expension library below. But you need to notice the little difference between the defult one and the expension one.
LiquidCrystal I2C
GND | Vcc | SDA | SCL |
---|---|---|---|
GND | 5V | A4 | A5 |
GND | Vcc | SDA | SCL |
---|---|---|---|
GND | 5V | A20 | A21 |