Thermal Print always print unwanted characters before printing

Projects Programming
1

I'm using Arduino Mega for using thermal print.
I've tried using software serial and hardware serial and using Adafruit_thermal libraries and Pos_Printer libraries, those combination still printing unwanted characters, even when using printer.begin(); its still print unwanted characters, pls help

2

Your topic was MOVED to its current forum category as it is more suitable than the original

3

Please post a sketch that illustrates the problem, using code tags when you do

4 

#include "Pos_Printer.h"
#include "hal9klogo.h"

Pos_Printer printer(&Serial1);

void setup() {

  Serial1.begin(9600);  // Initialize SoftwareSerial
  printer.begin();        // Init printer (same regardless of serial type)

  // Print the 500x85 pixel logo in Hal9klogo.h:
  printer.printBitmap(Hal9klogo_width, Hal9klogo_height, Hal9klogo_data);
  printer.feed();
}

void loop() {
}

this is using Pos_printer, with this library the printer always prints "8" everytime it about to print, even when I'm only using

printer.begin();

the Adafruit_Thermal isn't much better either, it prints a character before the things I tell it to print

5

I don't know the library but I found this in the source on github:

// *** EDIT THIS NUMBER *** Printer firmware version is shown on test
// page (hold feed button when connecting power). Number used here is
// integerized, e.g. 268 = 2.68 firmware.
#define PRINTER_FIRMWARE 629 //268

If this does not match your printer then certain control sequences could be interpreted as printable characters.

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6

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