Daylight Saving Time and 7-Segment example

[neptune2]

Hi Daniel,

Here is the WeatherStationDemoExtendedDST example for inclusion in the library. This is mostly the same code as https://github.com/neptune2/esp8266-weather-station-oled-DST but moved into the examples directory and renamed. Recent improvements include a settings.h file and #defines to support both SPI and I2C version of the SSD1306 display. I have verified that this works with both interface versions of the display.

Specific customizations include:

• Added Wifi Splash screen and credit to Squix78
• Modified progress bar to a thicker and symmetrical shape
• Replaced TimeClient with built-in lwip sntp client (no need for external ntp client library)
• Added Daylight Saving Time Auto adjuster with DST rules using simpleDSTadjust library
  • https://github.com/neptune2/simpleDSTadjust
• Added Locale Setting examples for Boston, Zurich and Sydney
  • Selectable NTP servers for each locale
  • DST rules and timezone settings customizable for each locale
  • See https://www.timeanddate.com/time/change/ for DST rules
  • Added AM/PM or 24-hour option for each locale
  • Added metric settings for each locale
• Changed Clock screen to 7-segment font from http://www.keshikan.net/fonts-e.html
• Added Forecast screen for days 4-6
  • includes a one line update to WundergroundClient.h to support 6 days of forecasts
• Added support for DHT22, DHT21 and DHT11 Indoor Temperature and Humidity Sensors
  • Verified on a DHT22 and DHT11 sensors
• Fixed bug preventing display.flipScreenVertically() from working (removed double ui init)
• Slight adjustments to overlay
• Moved user settings into settings.h
• Added #defines in settings.h to make it easier to select SPI or I2C interface for OLED in settings.h

Additional required library for automatic Daylight Saving Time adjust

• simpleDSTadjust Library

Regards,
Neptune

[squix78]

Hi Neptune

Wonderful code and many thanks for creating a pull request!

Regards,
Daniel