Ultrasonic Sensor

DYP-A02YY-V2.0 Ultrasonic Sensor

Preparation

• Rhino Pi-A1
• DYP-A02YY-V2.0 ultrasonic sensor (output via RS485, UART output also available)
• Several other connecting cables

Hardware Connection

• The sensor requires at least 5V power supply. However, since the 5V pin and GND pin of the Rhino Pi-A1 are still under debugging, this example supplies power to the sensor externally.

• Connect the RS485A and RS485B of the ultrasonic sensor to the RS485A and RS485B of the Rhino Pi-A1 for communication.

Testing

The Dianyingpu ultrasonic sensor only returns a ranging result after a ranging command is manually sent. Each time a command is sent, one result is returned.

1. Since the minicom test tool cannot send hexadecimal data to control the sensor ranging, you can write a script to convert the data and send it to the serial device for control. The script is as follows:

#!/bin/bash
# Check the number of arguments
if [ "$#" -ne 2 ]; then
    echo "Usage: $0 [serial device] [hex data]"
    exit 1
fi
# Serial device, e.g. /dev/ttyS2
SERIAL_PORT=$1

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

# Convert the hex data to a binary stream and send it to the serial device
printf "$HEX_DATA" | xxd -r -p > $SERIAL_PORT

2. Use the script to send the control command:

./send_hex.sh /dev/ttyHS1 '01030100000185F6'

• /dev/ttyHS1: the RS485 device of the Rhino Pi-A1
• 01030100000185F6: reads the processed value data. There are also other commands. For details, please refer to the Dianyingpu product manual.

3. Use the minicom tool in AidLux to receive data. (If not installed, install it via sudo apt update; apt install minicom). Open minicom:

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

• /dev/ttyHS1: the RS485 device of the Rhino Pi-A1
• -b 9600: sets the baud rate to 9600 (the default baud rate of the sensor is 9600)
• -H: displays hexadecimal data