How to Use Serial Array Unit to Read a Human Presence Sensor via UART on RA0E1 Fast Prototyping Board

Learn how we use the Serial Array Unit (SAU) on the RA0E1 Fast Prototyping Board to communicate with a human presence sensor through Universal Asynchronous Receiver/Transmitter (UART) operation. We configure the SAU to receive sensor data through the TXD and RXD pins and analyze the incoming values to determine whether a person is near the sensor. This content supports evaluation of UART‑based sensor interfaces and helps accelerate development of RA0E1 applications that rely on real‑time presence detection.