Convert a Bitstring into an integer value

Question

I have got a String filled up with 0 and 1 and would like to get an Integer out of it:

String bitString = ""; 
int Number;
int tmp;

bitString = "";
  for (i=1;i<=10;i++)
  {
    tmp= analogRead (A0);
    bitString +=  tmp % 2;
    delay(50);
  }
// now bitString contains for example "10100110" 
// Number = bitstring to int <-------------
// In the end I want that the variable Number contains the integer 166

score 6 · Accepted Answer · answered May 12 '14 at 19:33

If you only need the string for printing you can store value in an integer and then use the Serial.print(number,BIN) function to format the output as a binary value. Appending integers to strings is a potentially costly operation both in performance and memory usage.

int Number = 0;
int tmp;

for (int i=9;i>=0;i--) {
  tmp = analogRead (A0);
  Number += (tmp % 2) << i;
  delay(50);
}
Serial.print(Number, BIN);

Doowybbob · Answer 2 · 2014-05-12T19:20:28.937

5

Check out strtoul()

It should work something like this:

unsigned long result = strtoul(bitstring.c_str(), NULL, 2);

Now you have a long variable which can be converted into an int if needed.

edited May 12 '14 at 19:20

answered May 12 '14 at 19:14

Doowybbob

201
1
4

Convert a Bitstring into an integer value

2 Answers2