import machine

i2c = machine.I2C(0, scl=machine.Pin(21), sda=machine.Pin(20))

print('Scan i2c bus...')
devices = i2c.scan()

if len(devices) == 0:
  print("No i2c device !")
else:
  print('i2c devices found:',len(devices))

  for device in devices:  
    print("Decimal address: ",device," | Hexa address: ",hex(device))

print()

import ds1307
import time

ds = ds1307.DS1307(i2c)
ds.halt(False)

# Set initial datetime (year, month, day, weekday, hour, minute, second, subsecond)
now = (2023, 10, 27, 1, 5, 16, 3, 0, 0)
def format_datetime(datetime):
    year, month, day, weekday, hour, minute, second, subsecond = datetime
    return f"{year}-{month:02d}-{day:02d} {hour:02d}:{minute:02d}:{second:02d}"

while True:
    current_datetime = ds.datetime()

    formatted_datetime = format_datetime(current_datetime)
    print(formatted_datetime)

    time.sleep(1)