NTP clock on 4 OLED displays

    I wanted to created a special clock as a vintage clock with VFD display, so I realised ca easiest way is to use an i2c expander as TCA9584A chip/module.

   I used info from article Guide for TCA9548A I2C Multiplexer: ESP32, ESP8266, Arduino

   I used this schematic:

and I tested Santos's sketch:

   For a real NTP clock with DST selector (winter/summer time) I used this schematic and NTP_clock_TCA9548A_4OLEDs_1.ino sketch:

so combined schematic

   For DST=1 (summer time):

and for DST=0 (winter time)

  I uploaded 2 movies:

- NTP clock on 4 OLED displays

- NTP clock on 4 OLED displays (2)

After than I added the feature to see clock as VFD display, as in article 

Ceas NTP cu cifre din 7-segmente pe 4 afisaje OLED using my original sketch NTP_clock_TCA9584A_4OLEDs_3.ino

so you find how clock is in this video:

- NTP clock with 7-segment numbers on 4 OLED displays

- NTP clock with 7-segment numbers on 4 OLED displays (2)

   I moved the project from breafboard to a classical PCB (sandwich) with 2 PCBs):

so you can see the 2 other videos:

- NTP clock with 7-segment numbers on 4 OLED displays (3)

- NTP clock with 7-segment numbers on 4 OLED displays (4)

Bibliography:

- Ceas NTP pe 4 afisaje OLED

- Reproducere numere si caractere din 7 segmente pe afisaj OLED

- Ceas NTP cu cifre din 7-segmente pe 4 afisaje OLED

How to solve the issue with incorrect date/year extract from Unix time (with ESP8266 board)

original article

    A reader of my blogs announce my this issue about wrong conversion of the date/year when extract data from Unix Time (Epoch Time). Also, the solution for this issue is simple, like here: https://github.com/arduino-libraries/NTPClient/issues/149.

I open the Serial Monitor and epochTime is ok, but conversion to date not

- 1st step: TOOLS -> BOARD -> BOARD MANAGER

- 2nd step: ssearch ESP8266

- 3th step: search 2.7.4 version

- 4th step: wait to full install a old file

- 5th step: close Arduino IDE and restart Arduino IDE

- 6th: upload the sketch

    I tested and add some feature for clasical Morphing Clock:

- Ceas NTP cu tranzitii animate si date meteo pe afisaj P5 RGB 64x32 cu ESP8266

- Ceas NTP cu tranzitii animate si date meteo pe afisaj P5 RGB 64x32 cu ESP8266 (continuare)

- Ceas NTP cu tranzitii animate si date meteo pe afisaj P5 RGB 64x32 cu ESP8266 (3)

- Ceas NTP cu tranzitii animate si date meteo pe afisaj P5 RGB 64x32 cu ESP8266 (4)

NTP clock using OLED Wemos Lolin ESP32

   I buy an interesting ESP32 development board module because it has built-in OLED display drived with SSD1306 chip (is classc 0.96" OLED display).

  I combine 2 sketches to use NTP clock data (see https://en.wikipedia.org/wiki/Network_Time_Protocol for more info). This sketch is ESP32_OLED_SSD1306_NTP_0.ino who use ESP32-OLED0.96-ssd1306 and NTPtimeESP libraries.

   You can see how is clock displayed on OLED display while whatching NTP clock using OLED Wemis Lolin ESP32 movie.