Adressing variable using a string and an int in Arduino

Question

I wonder how I can address a variable by putting together a string and an int in Arduino. I´m using many variables of the same type and with almost the same name. I´m just append a number to each variable. The names of the variables are e.g. int sensorValue_1; int sensorValue_2; and so on. I´d like to write less because my code is becoming too long. When addressing the variables, I´d like to write something like this: sensorValue_[+ intVariable];

Here is an example of what I mean:

int sensorIndex_1 = 1;
int sensorIndex_2 = 2;
int sensorIndex_3 = 3;

int sensorValue_1;
int sensorValue_2;
int sensorValue_3;


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

void loop()
{
  doSomething(sensorIndex_1);
//doSomething(sensorIndex_2);
//doSomething(sensorIndex_3);
}

void doSomething(int sensorIndex)
{
  if(sensorIndex == 1)
  {
    Serial.print("Sensor 1: ");
    sensorValue_1 = analogRead(A1);
    Serial.println(sensorValue_1);
  }

  if(sensorIndex == 2)
  {
    Serial.print("Sensor 2: ");
    sensorValue_2 = analogRead(A2);
    Serial.println(sensorValue_2);
  }

  if(sensorIndex == 3)
  {
    Serial.print("Sensor 3: ");
    sensorValue_3 = analogRead(A3);
    Serial.println(sensorValue_3);
  }

  delay(1000);
}

And I want to shorten the code in the doSomething() method. I want to have something like this: Notice the "[+ sensorIndex]"

void doSomething(int sensorIndex)
{
  Serial.print("Sensor [+ sensorIndex]: ");
  sensorValue_[+ sensorIndex] = analogRead(A[+ sensorIndex]);
  Serial.println(sensorValue_[+ sensorIndex]);

  delay(1000);
}

By the way: I´d like to avoid for-loops, if possible. In my case, the code would become too complicated.
How do I manage this?

Jeff · Accepted Answer · 2013-08-02 15:03:28Z

2

User2461391 has a great start but the rest of the puzzle I think you want is:

int array1[3];
int array2[3];
int arrayx[3];


void setup()
{
}

void loop()
{
   int index=1;

   array1[2]=doSomething(2);
   arrayx[index]=doSomething(index);
   Serial.print("Sensor ");
   Serial.print(index);
   Serial.print(": ");
   Serial.println(arrayx[index]);         

   while(1);
}

int doSomething(int sensorIndex) // It probably makes more sense to return the value
{         
      return  (analogRead(sensorIndex));
}

edited Aug 2, 2013 at 15:03

answered Jul 29, 2013 at 18:05

Jeff

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Comments

user2461391 · Accepted Answer · 2013-07-29 13:22:15Z

1

You don't need to use A1 and A2 and the likes to define the analog pin you want to read. Just 1 or 2 will do.

void doSomething(int sensorIndex)
{
      Serial.print("Sensor ");
      Serial.print(sensorIndex);
      Serial.print(": ");
      sensorValue = analogRead(sensorIndex);
      Serial.println(sensorValue);

      delay(1000);
}

answered Jul 29, 2013 at 13:22

user2461391

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