2 layers178 × 80 mm
Panel 1x5
flummer/dmm-sao
A small digital multimeter specifically for measuring SAO related stuff
326 parts28CC-BY-SA-4.0
2 layers100 × 140 mm
Circle badge
bornhack/badge20253This badge focuses on LoRa and wireless communication in general, as there are also WiFi and Bluetooth Low Energy included in the ESP32-C3 module.
- Size
- 100 × 140 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 45
- Nets
- 51
- Pads
- 202
- Tracks, vias
- 346, 169
- Pours
- 11
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 21 Jul 2025
- Updated
- 23 Nov 2025
Overview
Circle badge is an open-source printed circuit board by bornhack, from the bornhack/badge2025 repository on GitHub, published under the CC-BY-SA-4.0 licence. It is a 2-layer board of 100 × 140 mm with 45 parts on 51 nets, routed with 346 tracks and 169 vias.
It is built around the ESP32-C3-MINI-1, XC6210B332MR and WS2812B-4020, with the BH-AA-A1AJ020, TS5220A and CJ2302 among its other parts. Its parts include 9 capacitors, 8 resistors, 5 diodes, 4 ICs and 3 switches. It belongs with the radio and wireless and lEDs and displays boards and the ESP32, RISC-V and NXP (LPC, Kinetis, i.MX RT) boards of this library.
Main components
9ESP32-C3-MINI-1
--40℃~+81℃ -89dBm 2.4GHz 350mA 3V~3.6V 82mA ESP32-C3 Chip On-board PCB Antenna UART - WiFi Modules ROHSRF CrazyWiFi Modules
XC6210B332MR
SOT-23-5-40℃~+85℃@(Ta) 1 25uA 3.3V 450mV@(800mA) 5.5V 70dB@(1kHz) 800mA Fixed Over Current Protection、Over Temperature Protection Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTECH PUBLICVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
WS2812B-4020
SMD,4x2mm-20℃~+70℃ 0.6mA 1.7mm 2mm 3.7V~5.3V 3.98mm 800Kbit/s B:465nm~475nm、R:620nm~625nm、G:515nm~525nm Built-in power-on reset circuit、Built-in power-on reset circuit、Integrated intelligent reverse connection protection function G:600mcd~1000mcd、B:200mcd~300mcd、R:300mcd~500mcd SMD,4x2mm RGB LEDs(Built-in IC) ROHSWorldsemiRGB LEDs(Built-In IC)BH-AA-A1AJ020
--10~80℃ Battery holder Nickel plated No. 5 - ROHSMYOUNGButton And Strip Battery Connector
TS5220A
SMD-4P,5.2x5.2mm-20℃~+80℃ 100 thousand cycles 12V 2.5N 2mm 5.15mm 5.15mm 50mA Gold Gull Wing No Round Button SPST Surface Mount,Vertical Without Bracket SMD-4P,5.2x5.2mm Tactile Switches ROHSSHOU HANTactile Switches
CJ2302
SOT-23-55℃~+150℃ 1 N-channel 1.2V 10nC@4.5V 115mΩ@2.5V 120pF 2.1A 20V 300pF 400mW 80pF N-Channel SOT-23 MOSFETs ROHSJiangsu Changjing Electronics Technology (CJ)MOSFETsCJ2305
SOT-23-50℃~+150℃ 1 P-Channel 12V 190pF 350mW 4.1A 740pF 90mΩ@1.8V SOT-23 MOSFETs ROHSJiangsu Changjing Electronics Technology (CJ)MOSFETs
MK-12C02-G015
SMD,6.6x1.4mm-20℃~+70℃ 1.4mm 10,000 Cycles 1A 4.2mm 6.6mm 6V Black Rectangular Columnar SPDT Surface Mount, Right Angle SMD,6.6x1.4mm Slide Switches ROHSG-SwitchSlide Switches
TYPE-C16PIN
SMD-25℃~+85℃ 1 10 thousand cycles 16P 3A 5V 7.35mm Black Female Surface Mount, Right Angle Type-C SMD USB Connectors ROHSSHOU HANUSB Connectors
README
README.mdBornHack 2025 Circle Badge with LoRa
This badge focuses on LoRa and wireless communication in general, as there are also WiFi and Bluetooth Low Energy included in the ESP32-C3 module.
It's a relatively bare bone design, with pretty much just the minimum elements to run a Meshtastic node or similar device.
Even though there is an antenna on the PCB for LoRa (868MHz) it's unfortunately not connected as the LoRa module is the variant that has a connector (uf.L/IPEX), so an external antenna is provided in the kit, that is designed to match with the connector on the module. The external antenna has selfadhesive backing, but don't mount it to the PCB, as most of the PCB is covered with copper, which will heavily decrese the performance, so if you want to stick it to something, better use a plastic case or similar.
The badge comes preinstalled with Meshtastic firmware, that you can hook up to and configure using the Mestastic app on your phone (Android or iOS). The two apps are slightly different, but does have more or less the same overall features.
If you want to use Meshtastic for a longer period, it's recommended to power the badge via USB-C (simple 5V, eg. power bank or power adapter).
In addition to the LoRa module, there are 5 RGB LEDs on the side, a qwiic/StemmaQT connector and a footprint for a SAO v1.69bis connector for expansions, mostly for alternative firmwares.
3D Printable case
In the case folder is a desing, done in OpenSCAD, for a half or back case, that snaps on to the PCB and covers the back part with the battery holders, antenna and LEDs.
There are two versions, one fully closed, and one with a cutout for mounting it on a wall using a screw.
Both should print on most FDM printers without the need for support, with the back side facing down on the build plate.
Projects running on the badge
Feel free to submit a PR adding on to this list with your project that runs on the badge.
- Initial Meshtastic firmware (Flasher tool)
- project name and link to more info
Designed in KiCad v9
To open the project, you will need to install a recent release version or one of the nightly builds, KiCad v8 or earlier won't open this design. The schematic as a PDF is included for reference.
License
The hardware design of the main branch of this repository is released under the following license:
- the "Creative Commons Attribution-ShareAlike 4.0 International License" (CC BY-SA 4.0) full text of this license is included in the LICENSE file and a copy can also be found at http://creativecommons.org/licenses/by-sa/4.0/
Parts
45| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | LOGO | LOGO | G***, G***, G***, G***, G***, G*** |
| 5 | WS2812B-4020 | Opto:WS2812B-4020 | D1, D2, D3, D4, D5 |
| 4 | 10K | Resistor_SMD:R_0603_1608Metric | R11, R12, R13, R14 |
| 3 | 1uF | Capacitor_SMD:C_0603_1608Metric | C1, C3, C7 |
| 2 | 100uF | Capacitor_SMD:C_1206_3216Metric | C2, C4 |
| 2 | 5.1K | Resistor_SMD:R_0603_1608Metric | R9, R10 |
| 2 | BH-AA-A1AJ020 | Power:Single_AA | BT1, BT2 |
| 2 | C | Capacitor_SMD:C_0603_1608Metric | C5, C9 |
| 2 | TS5220A | Button_Switch_SMD:SW_SPST_TL3342 | SW4, SW5 |
| 1 | #badgelife | badgelife_sao_v169bis:Badgelife-SAOv169-BADGE-2x3 | X1 |
| 1 | 0 ohm | Inductor_SMD:L_0603_1608Metric | L2 |
| 1 | 1.0T-4P | Connector_JST:JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J4 |
| 1 | 100nF | Capacitor_SMD:C_0603_1608Metric | C8 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric | C6 |
| 1 | 4.7k | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 47uH | Inductor_SMD:L_1210_3225Metric | L1 |
| 1 | 6.8k | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | Antenna_Dipole | Antennas:868 Inverted F Antenna | AE1 |
| 1 | CJ2302 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | CJ2305 | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | ESP32-C3-MINI-1 | PCM_Espressif:ESP32-C3-MINI-1 | U4 |
| 1 | MK-12C02-G015 | Button_Switch_SMD:SW_SPDT_PCM12 | SW1 |
| 1 | QX2304 | Package_TO_SOT_SMD:SOT-23 | U2 |
| 1 | TYPE-C16PIN | Connector_USB:USB_C_Receptacle_XKB_U262-16XN-4BVC11 | J3 |
| 1 | Wio-SX1262 / 113991436 | sensecap:MODULE12P-1.27-11X11.6MM | U3 |
| 1 | XC6210B332MR | Package_TO_SOT_SMD:SOT-23-5 | U1 |
Questions
How big is the Circle badge PCB?
It measures 100 × 140 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Circle badge use?
45 parts, built around the ESP32-C3-MINI-1, XC6210B332MR, WS2812B-4020 and BH-AA-A1AJ020. 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 Circle badge KiCad files?
From the bornhack/badge2025 repository on GitHub, at the commit this page was made from: the board is circle-badge.kicad_pcb and its schematic 5-ws2812.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Circle badge design in my own project?
Its repository publishes it under the CC-BY-SA-4.0 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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