Rs485 and arduino mini pro

Using Arduino Programming Questions
1

hi
I want to connect two arduino mini pro via rs 485. All settings and code are as follows. But there is no communication.

master :

int enablePin = 8;  
void setup()
{
  Serial.begin(9600);           
  pinMode(enablePin, OUTPUT);
  delay(10); 
  digitalWrite(enablePin, HIGH);  
}
void loop()
{
    Serial.println(460);      
    delay(3000);
}

Slave :

int enablePin = 8; 
void setup() 
{
  Serial.begin(9600);                   
  pinMode(enablePin, OUTPUT);
  delay(10);
  digitalWrite(enablePin, LOW);        //  (Pin 8 always LOW to receive value from Master)
  
}

void loop() 

{                                                  
  while (Serial.available())                 
     {         
        int pwmval = Serial.parseInt();        
        int convert = map(pwmval,0,1023,0,255);    
        Serial.println(convert);     
        delay(100);
    }
 }

(Code tags added by Moderator)

3jFWZ
3jFWZ1355×651 238 KB

2

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3

Hi,
So you read the data into the Tx and Rx of the slave.
Then try and send it back out the same Tx and Rx to the IDE monitor? ? ? ?

What baud rate have you got selected in the IDE monitor?

What do you see in the IDE monitor when it looking at the Master Tx Rx?

Thanks.. Tom.. :grinning: :+1: :coffee: :australia:

5

HI
The sender sends the number 460 and I see it on the IDE monitor
I also looped tx and rx on the transmitter side , So Arduino sends but is not received on the Receiver side.
I guess the data is not exchanged between rs485's.

I tried 4800, 9600 and 115200 baud rate but it still did not work.
Thankful

6

HI
Thankful

7

are you using the same pins (0&1) as the serial monitor?

where do you expect to see the following output?

8

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