Digital pins 0 & 1 are the TX and RX communication lines. A4 & A5 are shown on the schematic as being on JP2 a connector on the back. They are also known as SLA and SLC and can be used for I2C interfaces.
Digital pins 0 & 1 are the TX and RX communication lines. A4 & A5 are shown on the schematic as being on JP2 a connector on the back. They are also known as SLA and SLC and can be used for I2C interfaces.