String cod = "4532, 4488, 548, 1694, 574"; char *str = cod.c_str(); Edit 2: The ESP8266 compiler doesn't allow implicit conversion from const char* (read only) to char* (as strtok argument). To get around it, the clean solution is to copy it, as explained in my first edit.

It is the number of parameters and the assumption that plus will concatenate string literals. lcd.print("1234 " + number); This gives "34 " when number is 2. Why? This is because that is the result of adding 2 to the string literal pointer, i.e. the string starting at the character "3". Please use separate print statements instead:

Oct 8, 2016 · @max246: I just did a simple comparison printing a constant string (or format string) and an int variable. Not only is the sprintf() version 871 CPU cycles slower than individual Serial.print()s, it also makes the program 1314 bytes larger, and it creates an extra copy of the message in RAM.

Aug 26, 2018 · I'm new to Arduino and my first project is an RFID reader. since I need a lot of known tags list , i have a problem with not enough memory. for that reason I want to convert strings like : "426d9244", "1265dd39"... to a long int. I know it's been asked but as a new programer I find it hard to understand. an example would be very appreciated also.

May 4, 2015 · int val = Serial.parseInt() But, you will have to be sure that the non-number part of the message ("Slider") has already been dealt with. You could also put the data into an arduino String Object and use it's toInt method, or put it in a C style string and use the atoi method.

Now, it just happens that in Arduino HIGH means 1 and LOW means 0. And single digit numbers can be converted into character by just adding the numeric code of character “0”, which is 48 but can written as '0' in C++.

I wander what is the best option for formatting strings in Arduino for output. I mean what's a preferable way in the point of view of performance, memory usage – things like that. I see, people usually use direct Serial.print/println, like this: int x = 5; // 1st option Serial.print("x = "); Serial.println(x); Or like this:

The compiler (Arduino IDE v. 1.8.10) really produces warnings: ISO C++ forbids converting a string constant to 'char' [-Wwrite-strings]. Perhaps the simulator is more meticulous than the compiler and therefore refuses to work with a code thar generates warnings.

I am sending a list of servo positions via the serial connection to the arduino in the following format 1:90&2:80&3:180 Which would be parsed as: servoId : Position & servoId : Positi...

Nov 15, 2015 · Convert text array/buffer to integer and string. hi! i'm sending text to an arduino and the output of that library is a uint8_t array. Atm the text send is a number between "0" and "1023" void