Error with Wire.write

Projects Programming
1

I am trying to send two byte of data stored as a string to a dual channel potentiometer using I2C. I get an error message that says, "no matching function for call to 'TwoWire::write(String&)' and highlights the second Wire.write function at the very end of my program.

//10EF01FE = VOL+
//10EF718E = VOL-
//10EFC13E = CH+(VOL +10)
//10EF619E = CH-(VOL -10)
//10EF3BC4 = EXIT(MUTE)


#include <IRremote.h>
#include <Wire.h>
int RECV_PIN =  2;
IRrecv irrecv(RECV_PIN);
decode_results results;
int dpVdd = 12;

int potZero;
int potOne;
String zeroString = String(potZero, BIN);
String oneString = String(potOne, BIN);
const byte ds1882 = B01011110;

void setup()
{
  Serial.begin(9600);
  Serial.println("Enabling IRin");
  irrecv.enableIRIn(); // Start the receiver
  Serial.println("Enabled IRin");

  delay(500);// to power Vdd on digital pot after Vcc/V-
  digitalWrite(dpVdd, HIGH);
  
   potZero = 53;
   potOne = potZero+64;
   Serial.println(potZero, potOne);
   
   Wire.begin();
   Wire.beginTransmission(ds1882);
   Wire.write(zeroString);
   Wire.write(oneString);
   Wire.endTransmission();
  //SPI.begin();
  //pinMode(csPin, OUTPUT);
  //digitalWrite(csPin, LOW);
 //SPI.transfer(LR);
  //SPI.transfer(vol);
  //digitalWrite(csPin, HIGH);
  
}

void loop() {
  if (irrecv.decode(&results)) 
  {
    //Serial.println(results.value, HEX);
    if (results.value==0x10EF01FE) //VOL+
    {

      --potZero;//decreases attenuation not volume
      --potOne;//decreases attenuation not volume

    }
    else if (results.value==0x10EF718E) //VOL-
    {

      
      ++potZero;//increases attenuation not volume
      ++potOne;//increases attenuation not volume

    }
    else if (results.value==0x10EFC13E) //VOL+10
    {
      potZero -= 10;//decreases attenuation not volume
      potOne -= 10;//decreases attenuation not volume

    }
   else if (results.value==0x10EF619E) //VOL-10
    {
      potZero += 10;//increases attenuation not volume
      potOne += 10;//increases attenuation not volume

    }
    else if (results.value==0x10EF3BC4) //MUTE
    {
      potZero = 63;//max attenuation 
      potOne = 63;//max attenuation
        }
    potZero = constrain(potZero, 0, 63);
    potOne = constrain(potOne, 0, 63);
    Serial.println(potZero, potOne);    
    irrecv.resume(); // Receive the next value
  }
   Wire.begin();
   Wire.beginTransmission(ds1882);
   Wire.write(zeroString);//writes binary string to pot0
   Wire.write(oneString);//writes binary string to pot1 - error message highlights this line
   Wire.endTransmission();
  //digitalWrite(csPin, LOW);
  //SPI.transfer(LR);
  //SPI.transfer(vol);
  //digitalWrite(csPin, HIGH);
  delay(100);
}

All other examples I've seen of other people doing multiple byte sends shows to do it the way I did. Where did I go wrong?

2

From https://www.arduino.cc/en/Reference/WireWrite:

Syntax

Wire.write(value)
Wire.write(string)
Wire.write(data, length)

Those are the allowed parameters. What you need to understand is that a String and a string are not the same, even though the names are confusingly similar. You're attempting to pass a String to write() but it doesn't support that data type.

More information on String vs string:

3

Ah, I see the difference. I will attempt this project by transferring the data with the int equivalent of the binary value and see if that works.

Thanks for the clarification!