ArduinoDS1302Clock2ButtonMenuSystemOLED

Arduino with a DS1302 Real Time Clock Module and two buttons for setting time and date.
Utilizes the SoftTimer library at: https://github.com/prampec/arduino-softtimer
Original DS1302 code was created by Krodel at: http://playground.arduino.cc/Main/DS1302
Much of the work for the clock was done via the provided playground sketch.

OLED

OLED was a SSD1306 128x64 using the Adafruit SSD1306 library

Other Notes

You probably want to use the playground code "as is" to set the initial time once so values aren't empty when you start setting the time. I did not test this sketch with a blank DS1302, but if it gives you trouble, just use the JUST_THIS_ONCE flag in the original DS1302 code to set the time first.
My code is not great, but does work. I'm sure that someone could make it more efficient, and/or improve upon it. Maybe a rotary encoder, or more buttons, etc...
I could not get the 12 hr clock settings in the DS1302 code to work, so I ended up doing an if statement to set the AM/PM variable to display on the OLED.

To Do

• I did not impement any checks to verify the Day of the Month is valid for a given month. For example, it is possible to set 30 days for Feb, or 31 days for March, etc... Perhaps I'll fix in a later release.
• Add a flag/button to switch from 24hr time to 12hr time.

Schematic

PDF of the circuit at: Arduino_DS1302_RTC_Clock_with_OLED_2_Button.pdf