2 layers26 × 30 mm
Microcontroller
FrameworkComputer/ExpansionCards
Reference designs and documentation to create Expansion Cards for the Framework Laptop
34 parts1.1kCC-BY-4.0
2 layers37.9 × 69.1 mm
It is a LoRa ( Long Range ) powered pocket off grid pager.
- Size
- 37.9 × 69.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 35
- Nets
- 58
- Pads
- 143
- Tracks, vias
- 346, 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 29 May 2026
- Updated
- 17 Jul 2026
Overview
HUGINN is an open-source printed circuit board by basic-bitch-foundation, from the basic-bitch-foundation/HUGINN repository on GitHub. It is a 2-layer board of 37.9 × 69.1 mm with 35 parts on 58 nets, routed with 346 tracks and 2 vias.
It is built around the AP2112K-3.3. Its parts include 10 capacitors, 7 resistors, 5 switches, 2 ICs and 2 inductors. It belongs with the ESP32 boards of this library.
Main components
1README
README.mdHUGINN
Introduction
Huginn was crow of Odin (Greek God), He was messenger of hims. Thus this will be your personal messenger, let u communicate w/ hommies in any 9 realms.
It is a LoRa ( Long Range ) powered pocket off grid pager.
Build
It have BOM, Custom PCB, 3D printed Enclosure, buttons and suport. Download All files(.stp) from Enclosure printable folder and print 'em
It uses M2 screw everywhere For part link please download .odf not .csv In assembly u may see the MCU as colliding with PCB dw! it just cz I can't remove the header pins. :lollll:
Instructions
First comes the MCU U hve to castellated solder it on top of the board or can use very low height header pins
then Display as display I gave in BOM, Have 8 pin(Goes to HAT) to 8 , I will suggest to solder 'em direct , though half height n 2.54 header can use.
Stating with solder all component On PCB , As most part will be connected using wire to component to SMD solder Pad.
- Part u need to connect like this: ( Component--> wire--> Smd pad)
5 switches 2 LEDs Battery (optional)
-
The semi rotating switch have two part one is switch with rod dropped and a pad put the switch inside carv and then fix the pad on left face of rod so i can press momentary switch. Then, Screw it from bellow (Enough clamp so that It can't move freely but can move!)
-
As most part have support in Enclosure but gluing it make it smooth
-
Glue the disc motor that will send vibration through body
-
I don't gave the outing for LED cz It was ruining the Aesthetics of E ink's calm there so Any who want to see the charging status can place it nea usb input or a small hole behind panel
Code
This is basic firmware code u can compile and flash it in MCU using Platform.io (a extension in VS code) or using Thonny (IDE)
How to use it:
As pager need to be quick I added three code fn! and a local converter: So U navigate up/down between 143 ( I Love u!) 505 ( SOS ) etc. the click the send button when reciver will reciver get it wil automaticall converted in their own device . This save the bytes of daya is trasmitting and saving time
AI- decl.
I use like very little < 10% AI for code.
Outro
Made for Hackclub <3 by Saksham (A.K.A bbb) Feel free to contribute :heart:
Parts
35| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 10uF | Capacitor_SMD:C_0805_2012Metric | C1, C7, C8 |
| 2 | 100uF | Capacitor_SMD:CP_Elec_5x5.3 | C2, C6 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R6 |
| 2 | 4.7uF | Capacitor_SMD:C_0805_2012Metric | C9, C10 |
| 2 | 5.1kΩ | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5, R7 |
| 2 | LED | solderwirepad_1_02_SMD:SolderWirePad_1x02_SMD_5x5mm | L1, L2 |
| 1 | 100nf | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C4 |
| 1 | 100Ω | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | 10uf | Capacitor_SMD:C_0805_2012Metric | C5 |
| 1 | 2kΩ | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | 47uF | Capacitor_SMD:C_1206_3216Metric | C3 |
| 1 | AP2112K-3.3 | Package_TO_SOT_SMD:SOT-23-5 | VR1 |
| 1 | Battery | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | BT1 |
| 1 | D | Diode_SMD:D_SMA | D1 |
| 1 | ESP32-S3-DEVKITC-1U-N8R8 | ESP32-n8r8:ESP32-S3-DEVKITC-1-N8R8 | U1 |
| 1 | MCP73831-2-OT | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | Motor_DC | solderwirepad_1_02_SMD:SolderWirePad_1x02_SMD_5x5mm | M1 |
| 1 | Q_NMOS_GDS | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | SW_C | solderwirepad_1_02_SMD:SolderWirePad_1x02_SMD_5x5mm | SW3 |
| 1 | SW_DW | solderwirepad_1_02_SMD:SolderWirePad_1x02_SMD_5x5mm | SW4 |
| 1 | SW_L | solderwirepad_1_02_SMD:SolderWirePad_1x02_SMD_5x5mm | SW1 |
| 1 | SW_R | solderwirepad_1_02_SMD:SolderWirePad_1x02_SMD_5x5mm | SW5 |
| 1 | SW_SPST | solderwirepad_1_02_SMD:SolderWirePad_1x02_SMD_5x5mm | PSW1 |
| 1 | SW_UP | solderwirepad_1_02_SMD:SolderWirePad_1x02_SMD_5x5mm | SW2 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | J1 |
| 1 | display | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | EP1 |
| 1 | left | RA-02_LORA:MODULE_RA-02_LORA | LoRa1 |
Questions
How big is the HUGINN PCB?
It measures 37.9 × 69.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the HUGINN use?
35 parts, built around the AP2112K-3.3. 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 HUGINN KiCad files?
From the basic-bitch-foundation/HUGINN repository on GitHub, at the commit this page was made from: the board is h/h.kicad_pcb and its schematic Schematic/h.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the HUGINN design in my own project?
Its repository states no licence, so its author keeps all rights: ask basic-bitch-foundation before reusing the design.
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