-1. Connect **Vcc** and **GND**.
-2. Connect **Clock** and **Data** line.
- - **Interrupt**: **Clock** is on `PD1` and **Data** on `PD0`.(Recommended. Soarer's converter compatible)
- - **Busywait**: **Clock** is on `PD1` and **Data** on `PD0`.
- - **USART**: **Clock** is on `PD5` and **Data** on `PD2`.
-3. Optionally you need pull-up resistor. 1K-10K Ohm is OK.