RTC Module for Triaxial Numechron Clock

The Real Time Clock module increases the clocks time accuracy. No need for tuning of the clock speed as described in the original model. The price for a DC3231 RTC model is usually less than 12€ for 3 pieces. The housing is made for an Arduino Nano.

1) Build the clock as described in the original model.
2) Solder the stepper motor driver board to your processor board (Arduino Nano) as described in the original model. Use D4-D7 on the Arduino Nano and solder it directly to the stepper motor driver board, so that everything fits together later in the housing.

Additional Steps

3) Solder the RTC Module to the processor board (Arduino Nano)

• Connect GND and 5V
• Wire SCL on the RTC module to SCL on the processor board, for the Arduino Nano this is pin A5 
• Wire SDA on the RTC module to SDA on the processor board, for the Arduino Nano this is pin A4
• The other pins on the RTC module (SQW and 32K) stay unconnected

4) Download numechron.ino from the files section. Load the code to the processor. The code is written for Arduino Nano, there SCL/SDA connect to the default pins which are already set by the RTClib. If you have another processor make sure you set the pins correctly (see RTClib docu how to do this)

5) Print the housing and the part to press the reset button and fit everything into the housing. Use five 2mm tapping screws (length 5mm) to fix the boards to the housing. Use four 2mm tapping screws (length 8mm) to attach the lid to the box. The housing fits for Arduino Nano.

Have fun :-)

No changes to the clock itself. Added a DS3231 RTC module for time accuracy. Built new housing to contain also the RTC module. Changed and simplified Source Code.