2 layers22.2 × 46.4 mm
C64-Switchless Quad Kernal Switcher
bwack/C64-Switchless-Multi-Kernal-27C256-adapter
Kernal switcher for the C64/C64C/C128
14 parts112
2 layers56.7 × 83.9 mm
Atlice
Milk-Cool/atliceattiny85-based lice hairclips
- Size
- 56.7 × 83.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 13
- Nets
- 11
- Pads
- 36
- Tracks, vias
- 66, 0
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 12 Jun 2026
- Updated
- 20 Jun 2026
Overview
Atlice is an open-source printed circuit board by Milk-Cool, from the Milk-Cool/atlice repository on GitHub, published under the MIT licence. It is a 2-layer board of 56.7 × 83.9 mm with 13 parts on 11 nets, routed with 66 tracks and 0 vias.
It is built around the ATTINY85-20PU. Its parts include 10 connectors, 2 switches and 1 IC. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
README.mdatlice
attiny85-based multi-purpose lice hairclips
what is this?
this is a hairclip that can be used as either a mood indicator, a tamagotchi, or a portable weather station. well, not a hairclip by itself -- a pcb that can be attached onto a hairclip with rubber bands. it has multiple firmware modes available, all of which let you use the device in their own unique ways. it is based on the attiny85 chip, which isn't too powerful but is more than enough for this.
how do i use this?
first of all, get all the required components (listed in bom.xml, disregard components you don't need) and build it! the gerber files and the source project files are in this repo, too (see kicad/). here are some notes:
- get an SSD1306 display that a. works via i2c and b. has the power pin on the left. from what i could find, these also take 3V as the input just fine, which is perfect for our purposes since we use a CR2302 battery. (note: some sellers might send you the wrong type of display, like mine! please be aware of that)
- solder a 150Ohm resistor at J5-J6 and a 100Ohm resistor at J7-J8 and J9-J10.
- solder/attach the SSD1306 display facing inwards at J2, and the BMP180 temperature sensor also facing inwards at J3. the attiny85 goes at U1.
- attach the battery case at J1, with the top pin being the ground pin and the bottom pin being the +3V0 pin.
you can then attach it to a hairclip using small rubber bands with the grooves on the pcb (the "legs" of the louse).
once you have built it, flash the attiny85 with the appropriate firmware from firmware/. (note: if you want to permanently solder the attiny85 to the board, flash it before that! it'll be very hard to do it otherwise.)
then just turn on the battery and enjoy!!
controls
| mode | FUN | RST |
|---|---|---|
| mood indicator | - | change color/mood |
| weather station | - | turn on |
| tamagotchi | play with | feed/turn on |
why was this made?
i have an old mood indicator hairclip (inspired by a pi pico hot glued to a hairclip, which was gifted to me by a friend), which also has an attiny85. i built it around december of 2025, and wanted to push the concept of wearable hairclips even further ever since then. this is my next attempt, hopefully it's actually good!!
credits
- zine background: https://www.dreamstime.com/illustration/bug-wallpaper.html
Parts
13| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | Conn_01x01_Socket | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J5, J6, J7, J8, J9, J10 |
| 3 | Conn_01x04_Pin | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J2, J3, J4 |
| 2 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1, SW2 |
| 1 | ATtiny85-20P | Package_DIP:DIP-8_W7.62mm | U1 |
| 1 | Conn_01x02_Socket | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
Questions
How big is the Atlice PCB?
It measures 56.7 × 83.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Atlice use?
13 parts, built around the ATTINY85-20PU. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Atlice KiCad files?
From the Milk-Cool/atlice repository on GitHub, at the commit this page was made from: the board is kicad/atlice.kicad_pcb and its schematic kicad/atlice.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Atlice design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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