﻿OLED-Clock-2-nl - Manual:
=========================
This OLED-Clock has a Date+Time Display, an Alarm-Display, a Flashlight and
a Calendar of actual month+day. Alarm in 2nd. version is replaced with a Timer.
The Display is dimmed between 11:00PM and 7:00AM  (23:00h and 07:00h) at night.

Function of the 2 Buttons (on the right and on the left-side):
=========================

CHANGE-Button D7, (right-side), pressing:
-----------------------------------------
  1x = uC/Display and display time+date
  2x = light-up Flashlight/Torch
  3x = return to Normal-mode (=Mode-0)

SELECT-Button D6 (left-side)
----------------------------
Pressing D6 once selects MODE, rolling the Modes from 1-10 to change Date/Time
(dow, day, year, time, seconds, alarm... on/off) and set them with Button-D8.
To change the seconds, set the clock +1 minute, then press Button-D8 at 59 seconds 
to synchronize to external time.

Soft-Reset Pin
--------------
Reset-Pin-D7 resets all stored data if grounded (open case: bottom-right side).

Month-Calendar:
---------------
If left Button (D6) is pressed more than 0.6 seconds, an actual Month-Calendar 
is displayed. If one of the two Buttons are pressed once again, Calendar is left.

ALARM:
------
Can be set to beep on time match every day at the same time (24h, 60m).
An asterix on top-right of the Display indicates if the Alarm is "On" or not.

Battery:
--------
The battery is a CR2430 Lithium-Battery (ø24x3mm) with about 300mA Power.
A Battery-Symbol indicates the level of the battery (3,25V=full, 2,75V=empty).
The Clock is working with Voltages from +5,0V down to +2,0V (default: 3,0V).
Only the Flash-LED works from max. +4,0V down to +2,7V. Dont activate it with 5V.
Absolute Max.-Voltage for Processor and RTC is 5,25V (+5V USB to program the uC).

To-Do:
------
- Wireless Power-Transfer to charge a rechargeable Lithium-Battery (LIR2430).
- Timer instead of Alarm function.

!! Warning !!:
--------------
Don't recharge a non-rechargeable CR2430 LI-Ion-Battery (dangerous + toxic!).
