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.
| 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 |
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).
The circuit board is populated on both sides. The best way for soldering is within a vapor phase soldering system.
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 |
|---|---|
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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.
The DIAC can be configured throug UART or integrated push-buttons on the back side. The configuration throug UART is guided through a menu.
| Type | Link | Description |
|---|---|---|
| ATTiny1606 | Microcontroller datasheet | |
| MCP7940 | RTC (over I2C) datasheet |
|
| Crystal | Datasheet | |
| Crystal | Basic information sheet | |
| Font | html | Black Future Font |
R. GAECHTER