from lcd4bit import*

lcd_start()
cmd_wrt(0xc0+0)
string_write("BMT4033")
cmd_wrt(0xc0+8)
string_write("EMBEDDED")
while 1:
    for i in range(0,80,2):
        cmd_wrt(0x80+3)
        string_write("Count:")
        string_write(str(zfl_0(i,2)))
        sleep(0.2)




main.py

diagram.json

from machine import Pin
from time import sleep

dataline=[Pin(5,Pin.OUT),Pin(4,Pin.OUT),
          Pin(3,Pin.OUT),Pin(2,Pin.OUT)] #d4-d7

e=Pin(10,Pin.OUT)
rs=Pin(11,Pin.OUT)

def write(value):    
    dataline[0].value((value&0x10)>>4)
    dataline[1].value((value&0x20)>>5)
    dataline[2].value((value&0x40)>>6)
    dataline[3].value((value&0x80)>>7)    
    e.value(0)
    sleep(0.02)
    e.value(1)
    sleep(0.02)   
    dataline[0].value((value&0x01)>>0)
    dataline[1].value((value&0x02)>>1)
    dataline[2].value((value&0x04)>>2)
    dataline[3].value((value&0x08)>>3)    
    e.value(0)
    sleep(0.02)
    e.value(1)
    sleep(0.02)   

def cmd_wrt(value):  # write cmd
    rs.value(0)
    write(value)

def data_wrt(value): #cmd write
    rs.value(1)
    write(value)

def lcd_start():   
    cmd_wrt(0x02)
    sleep(0.1)
    cmd_wrt(0x28)
    sleep(0.1)
    cmd_wrt(0x0c)
    sleep(0.1)
    cmd_wrt(0x01)
    cmd_wrt(0x80)

def string_write(value):
    for i in value:
        data_wrt(ord(i))

def zfl(s,width):
    return '{:''>{w}}'.format(s,w=width)

def zfl_0(s,width):
    return '{:''0''>{w}}'.format(s,w=width)




   