README.md
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DIAC - Digital (Analog) Clock

The DIAC is a digital controlled clock with 88 controllable LEDs over shiftregisters. 84 LEDs are used to display time/date and 4 LEDs are for signaling the current status of the clock. There is an RTC MCP7940 for managing the time of accurately. For acoustic signalization, there is a buzzer on board. The core of the clocks is built by an ATTiny1606. The clock can be extended over an external/analog-pin. Powering the clock can be granted through USB or an external Supply (5V - 9V). The input voltage is line regulated to 3V3. The configuration of the clock can be done through a Terminal or with the push-buttons on the backside of the clock.

Downloads




  
Type
  
File
  
Description




  
Schematic
  
]]>pdf]]>/cadlab
  
Schematic files


  
Board
  
]]>pdf]]>/cadlab
  
Board file


  
Gerber
  
]]>zip]]>
  
Gerber/Drill files


  
Housing
  
]]>step/stl (zip)]]>
  
Housing (STEP) files


  
Firmware
  
]]>zip]]>
  
Firmware for Tiny1606




Hardware

There are two parts of the hardware. The pcb and the housing of the DIAC. The pcb is created with  KiCAD and the housing with FreeCAD. All files are build with github actions so that they are ready for a production environment. The housing is printed with a 3D-printer (Dremel 3D40).

PCB

The circuit board is populated on both sides. The best way for soldering is within a vapor phase soldering system.

Top Layer



Bottom Layer



Mechanical

The housing has a tolerance of 0.2mm on each side of the case. So the pcb should fit perfectly in the housing. The tolerance can be modified with FreeCAD in the setup Spreadsheet.




  
Assembled
  
Exploded




  

  





Programming

The Firmware of the DIAC can be programmed over UPDI. With a simple Adapter and a USB/UART bridge (e.g. FT232) the DIAC can be programmed with avrdude and serialupdi. Details of the adapter can be found ]]>here]]>.

Configuration

The DIAC can be configured throug UART or integrated push-buttons on the back side. The configuration throug UART is guided through a menu.

Additional Information




  
Type
  
Link
  
Description




  
ATTiny1606
  
]]>pdf]]>
  
Microcontroller datasheet


  
MCP7940
  
]]>pdf]]>
  
RTC (over I2C) datasheet


  
Crystal
  
]]>pdf]]>
  
Datasheet


  
Crystal
  
]]>pdf]]>
  
Basic information sheet


  
Font
  
]]>html]]>
  
Black Future Font




R. GAECHTER