Code issue. Please help

Projects Programming
1

sprintf(buffer, "%d,%d,%d",giatri1, giatri2, giatri3);
Serial.println(buffer);
delay(200); //
}
It said 'buffer' was not declared in this scope. How can I fix it?

2

Please, search Google for an example and then try to understand the function of sprintf(argument list) function to discover the meanings of the arguments of the function.

3

By declaring buffer.

4

try

    char buffer [40];
    sprintf(buffer, "%d,%d,%d",giatri1, giatri2, giatri3);
    Serial.println(buffer);