1  # Simple demo of printer functionality.
  2  # Author: Tony DiCola
  3  import board
  4  import busio
  5  
  6  import adafruit_thermal_printer
  7  
  8  # Pick which version thermal printer class to use depending on the version of
  9  # your printer.  Hold the button on the printer as it's powered on and it will
 10  # print a test page that displays the firmware version, like 2.64, 2.68, etc.
 11  # Use this version in the get_printer_class function below.
 12  ThermalPrinter = adafruit_thermal_printer.get_printer_class(2.69)
 13  
 14  # Define RX and TX pins for the board's serial port connected to the printer.
 15  # Only the TX pin needs to be configued, and note to take care NOT to connect
 16  # the RX pin if your board doesn't support 5V inputs.  If RX is left unconnected
 17  # the only loss in functionality is checking if the printer has paper--all other
 18  # functions of the printer will work.
 19  RX = board.RX
 20  TX = board.TX
 21  
 22  # Create a serial connection for the printer.  You must use the same baud rate
 23  # as your printer is configured (print a test page by holding the button
 24  # during power-up and it will show the baud rate).  Most printers use 19200.
 25  uart = busio.UART(TX, RX, baudrate=19200)
 26  
 27  # For a computer, use the pyserial library for uart access.
 28  # import serial
 29  # uart = serial.Serial("/dev/serial0", baudrate=19200, timeout=3000)
 30  
 31  # Create the printer instance.
 32  printer = ThermalPrinter(uart, auto_warm_up=False)
 33  
 34  # Initialize the printer.  Note this will take a few seconds for the printer
 35  # to warm up and be ready to accept commands (hence calling it explicitly vs.
 36  # automatically in the initializer with the default auto_warm_up=True).
 37  printer.warm_up()
 38  
 39  # Check if the printer has paper.  This only works if the RX line is connected
 40  # on your board (but BE CAREFUL as mentioned above this RX line is 5V!)
 41  if printer.has_paper():
 42      print("Printer has paper!")
 43  else:
 44      print("Printer might be out of paper, or RX is disconnected!")
 45  
 46  # Print a test page:
 47  printer.test_page()
 48  
 49  # Move the paper forward two lines:
 50  printer.feed(2)
 51  
 52  # Print a line of text:
 53  printer.print("Hello world!")
 54  
 55  # Print a bold line of text:
 56  printer.bold = True
 57  printer.print("Bold hello world!")
 58  printer.bold = False
 59  
 60  # Print a normal/thin underline line of text:
 61  printer.underline = adafruit_thermal_printer.UNDERLINE_THIN
 62  printer.print("Thin underline!")
 63  
 64  # Print a thick underline line of text:
 65  printer.underline = adafruit_thermal_printer.UNDERLINE_THICK
 66  printer.print("Thick underline!")
 67  
 68  # Disable underlines.
 69  printer.underline = None
 70  
 71  # Print an inverted line.
 72  printer.inverse = True
 73  printer.print("Inverse hello world!")
 74  printer.inverse = False
 75  
 76  # Print an upside down line.
 77  printer.upside_down = True
 78  printer.print("Upside down hello!")
 79  printer.upside_down = False
 80  
 81  # Print a double height line.
 82  printer.double_height = True
 83  printer.print("Double height!")
 84  printer.double_height = False
 85  
 86  # Print a double width line.
 87  printer.double_width = True
 88  printer.print("Double width!")
 89  printer.double_width = False
 90  
 91  # Print a strike-through line.
 92  printer.strike = True
 93  printer.print("Strike-through hello!")
 94  printer.strike = False
 95  
 96  # Print medium size text.
 97  printer.size = adafruit_thermal_printer.SIZE_MEDIUM
 98  printer.print("Medium size text!")
 99  
100  # Print large size text.
101  printer.size = adafruit_thermal_printer.SIZE_LARGE
102  printer.print("Large size text!")
103  
104  # Back to normal / small size text.
105  printer.size = adafruit_thermal_printer.SIZE_SMALL
106  
107  # Print center justified text.
108  printer.justify = adafruit_thermal_printer.JUSTIFY_CENTER
109  printer.print("Center justified!")
110  
111  # Print right justified text.
112  printer.justify = adafruit_thermal_printer.JUSTIFY_RIGHT
113  printer.print("Right justified!")
114  
115  # Back to left justified / normal text.
116  printer.justify = adafruit_thermal_printer.JUSTIFY_LEFT
117  
118  # Print a UPC barcode.
119  printer.print("UPCA barcode:")
120  printer.print_barcode("123456789012", printer.UPC_A)
121  
122  # Feed a few lines to see everything.
123  printer.feed(2)