SEN0313 A01NYUB Reference: API, Protocol & Pinout

The article provides a comprehensive overview of ultrasonic sensor communication protocols and API usage for Arduino and Raspberry Pi, detailing UART output data, checksum calculation, and distance measurement principles.

Library

Arduino: SoftwareSerial library (included with Arduino IDE)
Raspberry Pi: Ultrasonic Sensor Library

Communication Protocol Description

Output Communication

When "RX" floats or input High level, the module outputs processed value, the data is more steady, response time: 150-300ms; when input Low level, the module outputs real-time value, response time: 150ms.

UART	Data bit	Stop bit	Parity	Band rate
TTL level	8	1	none	9600bps

UART Output Form

Frame Data	Description	Byte
Header	0xFF	1 byte
DATA_H	Distance Data High 8-bits	1 byte
DATA_L	Distance Data Low 8-bits	1 byte
SUM	Checksum	1 byte

UART Output

Header	DATA_H	DATA_L	SUM
0xFF	0x07	0xA1	0xA7

checksum only reserves the low 8-bits of the accumulated value.

SUM=(Header+Data_H+Data_L)&0x00FF
=(0XFF + 0X07 + 0XA1)&0x00FF
=0XA7;

Distance= Data_H*256+ Data_L=0X07A1;
Equal to 1953 when converted into decimal;
Represent the current measured distance is 1953mm.

Principle

Ultrasonic distance sensor determines the distance to a target by measuring time lapses between the sending and receiving of the ultrasonic pulse.

Other Supplementary Information

STP Model
Installation Dimension: