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Edgar Bonet
Edgar Bonet
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#include <SoftwareSerial.h>
 
SoftwareSerial RS485Serial(10, 11); // RX, TX

void setup() 
{
RS485Serial.begin(4800);   // set the data rate 
Serial.begin(4800);
Serial.println("Start");

pinMode(12, OUTPUT);  
digitalWrite(12, HIGH);  // Init Transceiver   
}

byte buf[8];

int byteReceived;

void loop()
{
digitalWrite(12, HIGH);  

      byte  wind[] = {0x01, 0x03, 0x00, 0x00, 0x00, 0x02, 0xC4, 0x0B}; 
      RS485Serial.write(wind, sizeof(wind));
      Serial.flush();
RS485Serial.flush();
     // Serial.print(wind[0], HEX);
      Serial.println("Send");
      
digitalWrite(12, LOW); 
delayMicroseconds(200);  

RS485Serial.readBytes(buf,8);
delay(10);
Serial.println(buf[0], HEX);
Serial.println(buf[5], HEX);
Serial.println(buf[6], HEX);
Serial.flush();
RS485Serial.flush();
delay (1000);
}

#include <SoftwareSerial.h>

SoftwareSerial RS485Serial(10, 11); // RX, TX

void setup()
{
    RS485Serial.begin(4800);   // set the data rate
    Serial.begin(4800);
    Serial.println("Start");

    pinMode(12, OUTPUT);
    digitalWrite(12, HIGH);  // Init Transceiver
}

byte buf[8];

int byteReceived;

void loop()
{
    digitalWrite(12, HIGH);

    byte wind[] = {0x01, 0x03, 0x00, 0x00, 0x00, 0x02, 0xC4, 0x0B};
    RS485Serial.write(wind, sizeof(wind));
    Serial.flush();
    RS485Serial.flush();
    // Serial.print(wind[0], HEX);
    Serial.println("Send");

    digitalWrite(12, LOW);
    delayMicroseconds(200);

    RS485Serial.readBytes(buf, 8);
    delay(10);
    Serial.println(buf[0], HEX);
    Serial.println(buf[5], HEX);
    Serial.println(buf[6], HEX);
    Serial.flush();
    RS485Serial.flush();
    delay (1000);
}

#include <SoftwareSerial.h>
 
SoftwareSerial RS485Serial(10, 11); // RX, TX

void setup() 
{
RS485Serial.begin(4800);   // set the data rate 
Serial.begin(4800);
Serial.println("Start");

pinMode(12, OUTPUT);  
digitalWrite(12, HIGH);  // Init Transceiver   
}

byte buf[8];

int byteReceived;

void loop()
{
digitalWrite(12, HIGH);  

      byte  wind[] = {0x01, 0x03, 0x00, 0x00, 0x00, 0x02, 0xC4, 0x0B}; 
      RS485Serial.write(wind, sizeof(wind));
      Serial.flush();
RS485Serial.flush();
     // Serial.print(wind[0], HEX);
      Serial.println("Send");
      
digitalWrite(12, LOW); 
delayMicroseconds(200);  

RS485Serial.readBytes(buf,8);
delay(10);
Serial.println(buf[0], HEX);
Serial.println(buf[5], HEX);
Serial.println(buf[6], HEX);
Serial.flush();
RS485Serial.flush();
delay (1000);
}

#include <SoftwareSerial.h>

SoftwareSerial RS485Serial(10, 11); // RX, TX

void setup()
{
    RS485Serial.begin(4800);   // set the data rate
    Serial.begin(4800);
    Serial.println("Start");

    pinMode(12, OUTPUT);
    digitalWrite(12, HIGH);  // Init Transceiver
}

byte buf[8];

int byteReceived;

void loop()
{
    digitalWrite(12, HIGH);

    byte wind[] = {0x01, 0x03, 0x00, 0x00, 0x00, 0x02, 0xC4, 0x0B};
    RS485Serial.write(wind, sizeof(wind));
    Serial.flush();
    RS485Serial.flush();
    // Serial.print(wind[0], HEX);
    Serial.println("Send");

    digitalWrite(12, LOW);
    delayMicroseconds(200);

    RS485Serial.readBytes(buf, 8);
    delay(10);
    Serial.println(buf[0], HEX);
    Serial.println(buf[5], HEX);
    Serial.println(buf[6], HEX);
    Serial.flush();
    RS485Serial.flush();
    delay (1000);
}
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Hench
Hench
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Arduino UNO and RS485 Communication Problem

I am learning Arduino, a beginner in programming. I want to use Arduino UNO to connect a wind direction sensor RS485. The problem is the output in the serial monitor, the return data from the wind direction sensor is unstable. enter image description here

I need to get the return data from the wind direction sensor to get the wind direction. From the factory manual, they said sent a data to the sensor: 0x01 0x03 0x00 0x00 0x00 0x02 0xC4 0x0B and the sensor will return, like 0x01 0x03 0x04 0x06 0x48 0x00 0xA0 0x7A 0xD5

The wind direction dat at the above 5 and 6 position, the 0x00 0xA0 => 00A0H(HEX)=160 degree.

Tools: Arduino Uno Board

Wind Direction Sensor http://www.jnrsmcu.com/equipment/299.html

RS485 Board (3.3V) https://www.waveshare.com/rs485-board-3.3v.htm

The following is my coding:

#include <SoftwareSerial.h>
 
SoftwareSerial RS485Serial(10, 11); // RX, TX

void setup() 
{
RS485Serial.begin(4800);   // set the data rate 
Serial.begin(4800);
Serial.println("Start");

pinMode(12, OUTPUT);  
digitalWrite(12, HIGH);  // Init Transceiver   
}

byte buf[8];

int byteReceived;

void loop()
{
digitalWrite(12, HIGH);  

      byte  wind[] = {0x01, 0x03, 0x00, 0x00, 0x00, 0x02, 0xC4, 0x0B}; 
      RS485Serial.write(wind, sizeof(wind));
      Serial.flush();
RS485Serial.flush();
     // Serial.print(wind[0], HEX);
      Serial.println("Send");
      
digitalWrite(12, LOW); 
delayMicroseconds(200);  

RS485Serial.readBytes(buf,8);
delay(10);
Serial.println(buf[0], HEX);
Serial.println(buf[5], HEX);
Serial.println(buf[6], HEX);
Serial.flush();
RS485Serial.flush();
delay (1000);
}

Connection map: enter image description here