Serial.print(" Var 3:") Serial.println(var3) Serial.print(" Var 2:") Serial.println(var2) Using Streaming.h, in place of Serial.print("Var 1:") Serial.println(var1) So I added ESP8266 mention and a printf wrapper for common AVR modules As mentioned, it's not available on most of the AVR modules. \n is the escape sequence for the line feed.Įscape sequences are used to represent certain special characters within string literals and character literals. More details about formatting tips on the printf format reference page : No need for additional library or function. Its built-in in Serial class of the framework. Usage examples: p("Var 1:%s\nVar 2:%s\nVar 3:%s\n", var1, var2, var3) // strings Serial.print(buf) // Output result to Serial ![]() You can change the limit based on your requirements #include Ĭhar buf // resulting string limited to 128 chars The usage will depend of the data type of your variables. This is the function definition: #ifndef ARDPRINTFįor(i=0 str!='\0' i ) if(str='%') count Ĭase 'd': Serial.print(va_arg(argv, int)) Ĭase 'l': Serial.print(va_arg(argv, long)) Ĭase 'f': Serial.print(va_arg(argv, double)) Ĭase 'c': Serial.print((char)va_arg(argv, int)) Ĭase 's': Serial.print(va_arg(argv, char *)) It returns the number of arguments detected in the function call. The function prototype is: int ardprintf(char *. The output as expected is: test 2 123456789 g test 2.30 See it in action in this example:Īrdprintf("test %d %l %c %s %f", l, k, s, j, f) This function (given at the bottom) can be pasted in the beginning of the files where the function is needed. ![]() Ardprintf is a function that I hacked together which simulates printf over the serial connection.
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