Ultrasonic Sensor

DYP-A02YY-V2.0

Preparation

• Rhino Pi X1
• DYP-A02YY-V2.0 ultrasonic sensor (RS485 output mode, UART output is also optional)
• USB-to-RS485 adapter board

Hardware Connection

1. The sensor requires a minimum 5V power supply: connect the VCC and GND pins of the sensor to PIN2 and PIN6 (Raspberry Pi pin side) of Rhino Pi X1 respectively.
2. Connect the RS485A and RS485B pins of the ultrasonic sensor to the RS485A and RS485B pins of the USB-to-RS485 adapter board for communication.

3. Identify the USB-to-RS485 adapter board device:

ls -l /dev/ttyU*

Testing

The DYP ultrasonic sensor requires a manual distance measurement command to be sent to return a ranging result—one command sent yields one result.

1. Since the minicom testing tool cannot send hexadecimal data to control the sensor for ranging, a script can be written to convert the data format and send it to the serial port device. The script content is as follows:

#!/bin/bash
# Check the number of parameters
if [ "$#" -ne 2 ]; then
    echo "Usage: $0 [Serial Port Device] [Hexadecimal Data]"
    exit 1
fi
# Serial port device, e.g., /dev/ttyS2
SERIAL_PORT=$1

# Hexadecimal data, e.g., '1F2E3D4C'
HEX_DATA=$2

# Convert hexadecimal data to binary stream and send to the serial port
printf "$HEX_DATA" | xxd -r -p > $SERIAL_PORT

2. Send the control command using the script: sudo ./send_hex.sh /dev/ttyUSB0 '01030100000185F6'

./send_hex.sh /dev/ttyUSB0 '01030100000185F6'

• /dev/ttyUSB0: Device number of the USB-to-RS485 adapter board
• 01030100000185F6: Command to read processed value data. For other commands, refer to the DYP product manual.

3. Receive data using the minicom tool in AidLux (install it first if not present: sudo apt update; apt install minicom).

Open minicom: sudo minicom -D /dev/ttyHS1 -b 9600 -H

sudo minicom -D /dev/ttyUSB0  -b 9600 -H

• /dev/ttyUSB0: Device number of the USB-to-RS485 adapter board
• -b 9600: Set the baud rate to 9600 (default baud rate of the sensor)
• -H: Display data in hexadecimal format