discrepancy of time

[CashOlsen]

I'm trying to resolve a discrepancy of approximately -3 minutes in the reported time and the actual time.

MicroPython v1.20.0 on 2023-04-26; ESP module with ESP8266

ESP8266 D1 Mini V2 ESP-12F WiFi Module

gmtime()
(2023, 11, 21, 21, 10, 11, 1, 325)

PS C:\Users\Cash> get-date

Tuesday, November 21, 2023 9:13:45 PM

both timestamps were done with in a matter of seconds manually.

brainelectronics/micropython-ds1307

from ds1307 import DS1307
from machine import I2C, Pin
from time import gmtime, time

DS1307 on 0x68

I2C_ADDR = 0x68 # DEC 104, HEX 0x68

define custom I2C interface, default is 'I2C(0)'

check the docs of your device for further details and pin infos

this are the pins for the Lolin D1 mini board

the first parameter below was 0 which created an error on the ESP8266

the freq parameter below was changed from 800000 to 400000 for the ESP8266

i2c = I2C(scl=Pin(5), sda=Pin(4), freq=400000)
ds1307 = DS1307(addr=I2C_ADDR, i2c=i2c)

get the current RTC time

print("Current RTC time: {}".format(ds1307.datetime))

set the RTC time to the current system time

now = gmtime(time())
ds1307.datetime = now

print("Current RTC time: {}".format(ds1307.datetime))

Print the date and time in ISO8601 format: 2023-04-18T21:14:22

print("Today is {:04d}-{:02d}-{:02d}T{:02d}:{:02d}:{:02d}".format(
ds1307.year, ds1307.month, ds1307.day,
ds1307.hour, ds1307.minute, ds1307.second))