A little USB A timer user for the Pomdoro Technique.
- small and powerful ATTiny412 as MCU
- 12 WS2813B RGB LEDs
- 3 Buttons
- I2C Header for playing around
- power over USB C or integrated USB A connector
pcb/
: KiCAD Files for the electronic schematics and the routed layout
code/
: Arduino Code for a simple implementation of the pomodoro technique
housing/
: FreeCAD Model for a simple housing for the board
doc/
: Datasheets
- Components Library - Component library used for the PCB
- Serial D11C Programmer - UPDI Programmer used for flashing together with this adapter, but also possible with e.g.:
- MegaTinyCore - arduino library used for programming the ATTiny412
- an arduino environment, more in here
- KiCAD for editing the PCB/ creating other production files
- FreeCAD for editing the housing
| Designator | Footprint | Quantity | Designation |
|---|---|---|---|
| U6,U8,U3,U9,U11,U10,U2,U12,U4,U7,U5,U13 | LED_ADDR_Worldsemi_WS2812B | 12 | WS2812B |
| R2,R7 | R_1206 | 2 | 0R |
| J2 | PinHeader_01x04_P2.54mm_Vertical_THT_D1.4mm | 1 | I2C Header |
| P1 | Conn_USB_A_Plain | 1 | Conn_USB_A_Plain |
| C3 | C_1206 | 1 | 100nF |
| R3 | R_1206 | 1 | 100R |
| SW3 | Button_Omron_B3SN_6.0x6.0mm | 1 | Restart |
| R6,R1 | R_1206 | 2 | 1kR |
| D4 | LED_1206 | 1 | Power LED |
| SW1 | Button_Omron_B3SN_6.0x6.0mm | 1 | Start/Stop |
| U1 | SOIC-8_3.9x4.9mm_P1.27mm | 1 | ATtiny412 |
| J1 | PinHeader_01x03_P2.54mm_Vertical_THT_D1.4mm | 1 | UPDI Flash Header |
| J3 | Conn_USB_C_Socket_GCT_USB4125-GF-A-0190 | 1 | Conn_USB_C_Socket_PowerOnly |
| R5 | R_1206 | 1 | 499R |
| SW2 | Button_Omron_B3SN_6.0x6.0mm | 1 | Skip |