Forget using a RTC module, even though they are accurate and cheap. Use an NTP server instead.
See https://www.youtube.com/ralphbacon video #139
(Direct link to video: https://youtu.be/RCDBPsi01_c)
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I need to know the date & time for my project - but no DS3231 RTC (Real Time Clock) is required.
So my current Home Alone project requires the Date and Time to work properly. I immediately ordered a small RTC shield for my Wemos D1 mini - only to quickly realise I should not have bothered as I can get the date and time very accurately from a Network Time Protocol server and keep a local, accurate clock that drifts very infrequently thanks to a wonderful library, courtesy of Arduino.cc
And the local clock can be updated every so often by another call to the NTP pool, perhaps once a day or so.
Works like a dream. Even better, should the call to the NTP fail there is no need to panic. Eventually, it will resync and all will be well again.
Here we dive deep into the simple C++ code that is required to do all this with the help of a couple of libraries.
In a future video, I'll show you how you can convert the UTC (universal coordinated time) to local time. Easy to do, and works worldwide.
Wemos D1 Mini ESP8266 One is cheap but better value if you get 3 or 5. Also check out the different warehouses, in USA, CN and UK.
https://www.banggood.com/Wemos-D1-Mini-V3_0_0-WIFI-Internet-Of-Things-Development-Board-Based-ESP8266-4MB-p-1264245.html?p=FQ040729393382015118&utm_campaign=25129675&utm_content=3897
What I'm using for parameter and data, a micro SD card shield:
https://www.banggood.com/3Pcs-WeMos-Micro-SD-Card-Shield-For-WeMos-D1-Mini-TF-WiFi-ESP8266-Compatible-SD-Wireless-Module-p-1211052.html?p=FQ040729393382015118&utm_campaign=25129675&utm_content=3897
A power shield so you can it from a 7-12v supply (but the 5v phone charger on the ESP8266 board works too):
https://www.banggood.com/3Pcs-WeMos-DC-Power-Shield-V1_0_0-For-WeMos-D1-Mini-p-1189337.html?p=FQ040729393382015118&utm_campaign=25129675&utm_content=3897
All about the NTP protocol:
https://tttapa.github.io/ESP8266/Chap15%20-%20NTP.html
List of all ports in use:
https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers
More on time zones (I will implement this in my project code):
https://github.com/JChristensen/Timezone
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My channel and blog are here:
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