2 layers40 × 30 mm
Esphome xiao base
0rax/esphome-xiao-base
XIAO base board PCB & configuration for ESPHome based sensors.
10 parts5CERN-OHL-S-2.0
2 layers82.7 × 51.9 mm
Hollow Alarm
NLEVEL-GIT/Hollow-Alarm1An Alarm with Hollow Knight features
- Size
- 82.7 × 51.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 11
- Nets
- 15
- Pads
- 60
- Tracks, vias
- 63, 0
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 3 Sep 2026
- Updated
- 8 Sep 2026
Overview
Hollow Alarm is an open-source printed circuit board by NLEVEL-GIT, from the NLEVEL-GIT/Hollow-Alarm repository on GitHub. It is a 2-layer board of 82.7 × 51.9 mm with 11 parts on 15 nets, routed with 63 tracks and 0 vias.
It is built around the XIAO ESP32C3. It belongs with the ESP32 and RISC-V boards of this library.
Main components
1README
README.mdHollowAlarm
HollowAlarm was my ship for the Blare Mission of Stardance Hackclub
HollowAlarm features a simple clock like shape design with 4 keys to controlFeatures:
- 2.25 Inch TFT Display
- 4 Keys
- Buzzer... cuz its and alarmCAD Model:
HollowPad is divided in 4 parts.
- the main shell where eveything connects that include a sorta of cabinet design and dovetail joints to connect to the shell of the alarm.
- The shell itself consisting of the front piece and back piece to close the clock design
Everything was in Fusion cuz its lowk fire
PCB
It was made in KiCad. Only requiring extra footprints ansd symbols provided by the Blare page!
The footprints for the Switches are standart MX style Switches!Schematic:
PCB Layout:
Also it has a lot of small silkscreens cuz they lowk cool!Firmware Overview
The firmware can be described as spaghetti code secured by hopes and dreams.
It gives each button its own function and has a way to swap between 4 background which I made! More can be added by changing the background.h file on the firmware
BOM:
Here should be everything you need to make this hackpad
- 4x Cherry MX Switches
- 4x DSA Keycaps (or you can make some if u want)
- 1x Buzzer
- 1x 2.25" 284x76 TFT Display
- 1x XIAO ESP32C3
- 1x Case (4 Printed Parts)Extra stuff
To anyone that is reading the end of this READ ME i wana say thanks for atleast checking out my project.
With that thanks again and Good Luck on your projects!!!Parts
11| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | SW_Push | Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB | MX_Cherrry, Mx_Cherry, MX_Cherry, MX_Cherry |
| 1 | Buzzer | Buzzer_Beeper:Buzzer_12x9.5RM7.6 | Buzzer |
| 1 | Conn_01x08_Pin | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | Screen |
| 1 | LOGO | _Customs:HackClubFlag | G*** |
| 1 | LOGO | _Customs:GUDHK | |
| 1 | XIAO_ESP32_C3 | Seeed_Studio_XIAO_Series:XIAO-ESP32-C3-DIP | XIAO_ESP32_C3 |
The 9 most common of 11 parts.
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Questions
How big is the Hollow Alarm PCB?
It measures 82.7 × 51.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Hollow Alarm use?
11 parts, built around the XIAO ESP32C3. 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 Hollow Alarm KiCad files?
From the NLEVEL-GIT/Hollow-Alarm repository on GitHub, at the commit this page was made from: the board is pcb/Hollow Alarm.kicad_pcb and its schematic pcb/Hollow Alarm.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Hollow Alarm design in my own project?
Its repository states no licence, so its author keeps all rights: ask NLEVEL-GIT before reusing the design.