pot value

Projects Programming
22

well, I am getting or something similar...also will get greek letters if I change to read or available:

<

<




2
7
2




>
<
27
>

Using this code, without availabable and read commented, I get available '0' and read is '-1'.

int potPin = 0; // select input pin 
int val; // variable to store the value
int lastVal = 0;

void setup() {
Serial.begin(9600);
}

void loop() 
{
  val = analogRead(potPin); // read the value from the pot
  if(abs(val - lastVal) > 5)
  {
    Serial.println("<");
    Serial.println(val); 
    Serial.println(">");
    lastVal=val;
  }
}

receiver

//read in value from first arduino of slide pot
//#include "RoboClaw.h"
//#include "BMSerial.h"
 
//read till end of packet
char string[4]; //can be 4, 8 is fine
int var;
int index = 0;
boolean started=false;
boolean ended=false;


void setup()
{
  Serial.begin(9600);
    //int v=Serial.available();
    //Serial.println(v);
      //var=Serial.read();
      //Serial.println(var);
}

void loop()
{

    while(Serial.available() > 0)
    {
      var=Serial.read();
      if(var=='<') 
      {
        started = true;
        index=0;
        string[index]='\0';
      }
      else if(var=='>')
      {
        ended = true;
        break; //break out of while loop when '>' received
      }
      
      else if(started)
      {
        string[index]=var;
        index++;
        string[index]='\0';
        string[index]=var; //store character
      }
    //x = Serial.read(); //read another string
    }
    
    if(started && ended)
    {
      //convert portion of string to integer representation
      int val=atoi(string); 
      Serial.println("<");
      Serial.println(val);
      Serial.println(">");
      
      //next time
      started = false;
      ended = false;
      
      index = 0;
      string[index]='\0';
    }
  }

Testing the sender code and I seems to be correct as I get the correct output.

475
>
<
487
>
<
499
>
<
510
>
<
521