’ Do You Want a Receipt for Your Packets ? ’ … 
arduino uno code
/*------------------------------------------------------------------------
ttnlogo on GOOJPRT QR701 58mm Mini Embedded Receipt Thermal Printer TTL
https://www.aliexpress.com/item/GOOJPRT-QR701-58mm-Mini-Embedded-Receipt-Thermal-Printer-TTL-Low-Noise-Thermal-Dot-Printing-Support-ESC/32890543330.html
-power from a separate supply min 5-9v - 2 A !
BMP to .h converter howto :
https://cdn-learn.adafruit.com/downloads/pdf/mini-thermal-receipt-printer.pdf
--------------------------------------------------------------------------*/
#include "Adafruit_Thermal.h"
#include "ttnlogo.h"
#include "SoftwareSerial.h"
#define TX_PIN 5 // Arduino transmit blue
#define RX_PIN 6 // Arduino receive yellow
SoftwareSerial mySerial(RX_PIN, TX_PIN);
Adafruit_Thermal printer(&mySerial);
void setup() {
mySerial.begin(9600);
printer.begin();
printer.feed(1);
printer.printBitmap(ttnlogo_width, ttnlogo_height, ttnlogo_data);
printer.feed(3);
}
void loop() {
}