Convert strings to inputs and outputs names?

Using Arduino Programming Questions
1

I know its a little bit strange but this is what I need to do.
The code gets some string (*char or String), in the name "A0" or "A1"

Then I need to use this string to read the relevant analog - A0 or A1 accordingly.
so I can't just use the string as the pin name, and the only way I see is to use some conditions:

//pseudo
  if( A0)
      read A0
  else if (A1)
      read A1

Is there any other elegant way to do this directly using the strings names with some conversion ?

2

No, there is no direct way.

A way would be to

  • Read the full string. A delimiter like newline can assure you read it all
  • Split it into the right category. If you only want to do analog (aka start with A) then you're done
  • Convert the number part from ASCII to a value. (hint, atoi() )
  • Use that value to do the reading analogRead(0) will read A0 etc

Btw, just go for the char array version.

3

Since you are only interested in analog names, you could do something like (haven't tested it):

  char Name[2];
  analogRead(int(Name[1]) - int('0'));

Obviously you need to ensure that what you read is actually the correct name of an analog pin.

4

Since a char is an int, just:

 char Name[3];  // leave space for null
 ...    // populate the string
 if (Name[1] >= '0' && Name[1] <= '5')  // be paranoid
   value = analogRead(Name[1]-'0');
5

gil22:
I know its a little bit strange but this is what I need to do.
The code gets some string (*char or String), in the name "A0" or "A1"

Then I need to use this string to read the relevant analog - A0 or A1 accordingly.
so I can't just use the string as the pin name, and the only way I see is to use some conditions:

//pseudo

if( A0)
      read A0
  else if (A1)
      read A1





Is there any other elegant way to do this directly using the strings names with some conversion ?

Encapsulate it in a function.

val = analogRead(strToPort(inputString));
6