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I receive some data in a char variable, and the result in teststring is always a number. How can I convert this number to a variable int?
After that I can put the int variable on delay time. There is a piece of my code:
String readString = String(30);
String teststring = String(100);
int convertedstring;
teststring = readString.substring(14, 18); (Result is 1000)
digitalWrite(start_pin, HIGH);
delay(convertedstring); // Result of teststring convert
digitalWrite(start_pin, LOW);
378
In Java, we can convert the Char to Int using different approaches. If we direct assign char variable to int, it will return the ASCII value of a given character. If the char variable contains an int value, we can get the int value by calling Character. getNumericValue(char) method.
Allows you to convert a String to an integer number. The toInt() function allows you to convert a String to an integer number. In this example, the board reads a serial input string until it sees a newline, then converts the string to a number if the characters are digits.
To convert char to String we can use the String() function. This function takes a variable as an input and returns a String object. In the above code, myChar is a variable of type char to store the given char and myString is a variable of type String to store the conversion result.
The atoi() function converts a string to an integer value. It may be because I read somewhere that Arduino now has a string library with the software so I do not need to unzip and drag a WString library to the arduino library. Case is important. The Arduino has a String library.
Use:
long number = atol(input); // Notice the function change to atoL
Or, if you want to use only positive values:
Code:
unsigned long number = strtoul(input, NULL, 10);
Reference: http://www.mkssoftware.com/docs/man3/atol.3.asp
Or,
int convertedstring = atoi(teststring.c_str());
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