- Written by Jan Holbo Rasmussen Jan Holbo Rasmussen
- Published: 24 September 2016 24 September 2016
The Kaddu Klock is modular by design, making expanding and development easier.
The main (required) modules are:
- Display module
- Core module
- Power module
Other possible expansions could be
- Real Time Clock (RTC) module
- GPS module (for time and possibly zonal position)
- Radio module (e.g. DCF77)
- WiFi module
This could be any type of display. So far this has been 7 Segments (x6) LED and a 16 x 8 LED matrix, both built on solderless breadboards and driven by SN74HC595 shift registers.
The next (planned) Display module is the first to be built on a fixed circuit board and will be a 24 x 16 LED matrix built on a 90 x 70 mm prototype veroboard with 6x 788BS (1.9mm LED 8 x 8 matrix) modules, driven by 5 SN74HC595 serial shift registers; 2 controlling the rows and 3 controlling the columns.
As the Display module will probably be the largest module it will probably be the base upon which all other modules are mounted on.
The Display module will be driven by two powerlines; Vcc (5V) and GND; and by 4 datalines controlling the cascaded SN74HC595s; SER, RCLK, SRCLK and SRCLR (Texas Instruments naming style)
The Core module hosts the (main) microcontroller that controls the other modules and runs the main code.
The current Core module is an Arduino Nano sat in a development board.
Provides power from an outside power source and/or internal battery storage, including charging circuitry fir said batteries.
The current Power module is an off-the-shelf USB PowerBank.