How to convert string variable to integer in Arduino

How to convert a string variable to int, long in Arduino code?

Answer

There are two types of string: String() object and char array.

If you uses String() object, call myString.toInt()

void setup() { Serial.begin(9600); String myString = "125"; int myInt = myString.toInt(); Serial.println(myInt); } void loop() { }

COM6

Send

125

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Clear output

9600 baud

Newline

If it's a char array, call atoi(myString) .

void setup() { Serial.begin(9600); char myString[6] = "126"; int myInt = atoi(myString); Serial.println(myInt); } void loop() { }