A simple library for interacting with the Samsung 20S207DA1 VFD

samsungvfd.py

# Library for using Samsung 20S207DA1
# Based on https://www.pollin.de/productdownloads/D120394D.PDF

import serial

class Samsung20S207DA1:
    DIM_0 = b'\x04\x00'
    DIM_20 = b'\x04\x20'
    DIM_40 = b'\x04\x40'
    DIM_60 = b'\x04\x60'
    DIM_80 = b'\x04\x80'
    DIM_100 = b'\x04\xFF'

    BACKSPACE = b'\x08'
    TAB = b'\x09'
    CARRIAGE_RETURN = b'\x0D'

    ALL_DISPLAY = b'\x0F'

    DISPLAY_POSITION = b'\x10'

    CURSOR_OFF = b'\x14'
    CURSOR_ON = b'\x15'
    CURSOR_BLINK = b'\x16'

    DOT_CURSOR_LIGHTING = b'\xFF'
    DOT_CURSOR_BLINKING = b'\x88'
    DOT_CURSOR_NO_LIGHTING = b'\x00'

    RESET = b'\x1F'

    def __init__(self, port, baud=9600, parity=serial.PARITY_NONE,
            stopbits=serial.STOPBITS_ONE, bytesize=serial.EIGHTBITS):
        self.vfd = serial.Serial(
                port=port,
                baudrate=baud,
                parity=parity,
                stopbits=stopbits,
                bytesize=bytesize
        )

    def write(self, string):
        self.vfd.write(string.encode('ascii'))

    def set_dim(self, dim):
        self.vfd.write(dim)

    def backspace(self):
        self.vfd.write(self.BACKSPACE)

    def tab(self):
        self.vfd.write(self.TAB)

    def enter(self):
        self.vfd.write(self.CARRIAGE_RETURN)

    def all_display(self):
        self.vfd.write(self.ALL_DISPLAY)

    def set_pos(self, pos):
        self.vfd.write(self.DISPLAY_POSITION + bytes.fromhex(format(pos, '02x')))
    
    set_cursor_mode = set_dim
    
    set_dot_cursor_mode = set_dim

    def reset(self):
        self.vfd.write(self.RESET)