MicroPython Forum (Archive)

Code: Select all

ssid = ' ' 
pw   = ' '  
i2c_addr = 0x27  
tz_hour  = 8     
# --------------------------------------------------
import network, ntptime, utime, gc
from machine import Pin, SoftI2C, Timer
from esp8266_i2c_lcd import I2cLcd
gc.enable()
led = Pin(2, Pin.OUT, value=1)
lcd = I2cLcd(SoftI2C(scl=Pin(5), sda=Pin(4)), i2c_addr, 2, 16)
wday  = ('Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun')
def lcd_show(text, clear=True):
    if clear:
        lcd.clear()
    lcd.move_to(0, 0)
    lcd.putstr(text)
lcd_show('Connecting to\n  WiFi...')
wifi = network.WLAN(network.STA_IF)
wifi.active(True)
wifi.connect(ssid, pw)
while not wifi.isconnected():
    pass
def time_update(timer):
    while True:
        try:
            ntptime.settime()
            break
        except:
            utime.sleep(10)
def time_display(timer):
    led.value(not wifi.isconnected())
    dt = list(utime.localtime(utime.time() + tz_hour * 3600))
    dt[6] = wday[dt[6]]
    output = ' {0:4d}-{1:02d}-{2:02d} {6}\n   {3:02d}:{4:02d}:{5:02d}'
    lcd_show(output.format(*dt), clear=False)
    
time_update(None)
timer_ntp, timer_display = Timer(-1), Timer(-1)
timer_ntp.init(mode=Timer.PERIODIC, period=900000, callback=time_update)
timer_display.init(mode=Timer.PERIODIC, period=100, callback=time_display)

Code: Select all

from  machine import Pin,I2C
from esp8266_i2c_lcd import I2cLcd

i2c=I2C(sda=Pin(4), scl=Pin(5), freq=10000)   

devices=i2c.scan()
if len(devices) == 0:
 print("No i2c device !")
else:
 print('i2c devices found:',len(devices))
for device in devices:
    print("At address: ",hex(device))

lcd = I2cLcd(i2c, 0x3f, 2, 16)
lcd.putstr("Hello")

i2c devices found: 1
At address:  0x3f

##just blinks at the end ...

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