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The PCB should be 1,6mm thick i order to hide the components inside.
I had them made here: http://dirtypcbs.com/store/designer/details/20546/6202/2d-christmas-tree-decoration-item
They handle the castellation well, if you order them somewhere else check their rules about this.
The Files are made with KiCad 5.0.1
| Reference Type | Quantity | Reference | Value | Footprint | RS | Digikey |
|---|---|---|---|---|---|---|
| BT | 2 | BT1-BT2 | Battery_Cell | CR2016 | - | - |
| C | 1 | C1 | 22µF | 0805 | 790-0682 | 1276-6786-1-ND |
| D | 20 | D1-D20 | LED | 0805 | 176-6117 | 516-1431-1-ND |
| J | 1 | J1 | ISP | - | - | |
| R | 5 | R1-R5 | 75 | 0805 | - | RR12Q75DCT-ND |
| R | 1 | R6 | 10k | 0805 | 125-1189 | RR12P10.0KDCT-ND |
| SW | 1 | SW1 | SW_SPDT | PCM12SMTR | 793-1721 | 401-2016-1-ND |
| U | 1 | U1 | ATTINY25-20SU | SOIC8 | 133-1611 | ATTINY25-20SU-ND |
Arduino IDE is used to programm the ATtiny, you will need to import the ATtiny with the board manager to get support for it.
To burn it onto the AVR an ISP programmer is needed. That can be done with ArduinoISP https://www.arduino.cc/en/Tutorial/ArduinoISP
