2 layers142 × 58 mm
2 layers46 × 0.2 mm
Layouts
izzyhub/bbr2_pcbBrain board for a Michael Baddeley–style BB-R2 mini droid: ESP32-S3 (wakeword- capable), I2S mic + speaker amp, IMU, 6 servo outputs, addressable lights, Grove/Qwiic sensor ports (Grove Vision AI V2 camera, mmWave), and…
- Size
- 46 × 0.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 97
- Nets
- 77
- Pads
- 369
- Tracks, vias
- 1,215, 209
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 19 Jul 2026
- Updated
- 31 Jul 2026
Overview
Layouts is an open-source printed circuit board by izzyhub, from the izzyhub/bbr2_pcb repository on GitHub, published under the MIT licence. It is a 2-layer board of 46 × 0.2 mm with 97 parts on 77 nets, routed with 1,215 tracks and 209 vias.
Its parts include 34 capacitors, 25 resistors, 10 ICs, 6 connectors and 5 diodes.
README
README.mdbbr2_pcb
Brain board for a Michael Baddeley–style BB-R2 mini droid: ESP32-S3 (wakeword- capable), I2S mic + speaker amp, IMU, 6 servo outputs, addressable lights, Grove/Qwiic sensor ports (Grove Vision AI V2 camera, mmWave), and a 1S LiPo power system with USB-C + Qi charging.
Read docs/DESIGN.md first — architecture, part choices, GPIO map, connector pinouts, and the current workaround for the atopile registry outage.
Created by Izzy izzy@izzyhub.com
Building
The upstream atopile components API is currently unreachable (July 2026), so parts are served by a local stand-in that must be running during builds:
# Terminal 1 — parts server (needs ../atopile-packages checkout, see below)
python tools/parts_server.py
# Terminal 2 — build, then fix atopile's broken mounting-hole tags syntax
# (KiCad refuses to open the board without the patch)
ato build
python tools/patch_board.pyDependencies are vendored via file:// specs from a sparse clone of
github.com/atopile/packages at ../atopile-packages. To recreate it:
git clone --depth 1 https://github.com/atopile/packages.git ..\atopile-packages
# (a few files with '*' in their names fail to checkout on Windows; harmless)Layout
ato build emits/updates layouts/default/default.kicad_pcb. Open it in
KiCad 9 for placement + routing; re-running ato build preserves layout while
syncing netlist changes.
Project files
| File | Contents |
|---|---|
main.ato | Top-level App: ESP32-S3 + all subsystems, GPIO assignments |
power.ato | Battery, BQ25185 charger, MAX17048 gauge, 3V3 + 5V TPS63020 rails |
audio.ato | MAX98357A amp + speaker connector |
servos.ato | 6x 3-pin servo headers |
lights.ato | Level shifter + on-board SK6805s + LED string connector |
expansion.ato | Grove I2C / Grove UART ports |
parts/ | Local atomic parts (amp, connectors, diodes, bulk caps) |
tools/parts_server.py | Offline components-API stand-in |
tools/patch_board.py | Post-build fix for corrupted (tags ...) in generated boards |
Parts
97| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 100nF ±10% | SAMSUNG_CL05B104KO5NNNC:C0402 | C2, C4, C6, C7, C8, C9, C10, C11, C23, C30, C33, C34 |
| 12 | 10kΩ ±1% | UNI_ROYAL_0402WGF1002TCE:R0402 | R1, R2, R3, R4, R5, R7, R15, R16, R17, R18, R21, R24 |
| 8 | 22µF ±20% | SAMSUNG_CL21A226MAQNNNE:C0805 | C19, C20, C21, C22, C26, C27, C28, C29 |
| 7 | BOOMELE_2_54_1_3P:HDR-TH_3P-P2.54-V-M-1 | H1, H6, H7, H8, H9, H10, H11 | |
| 6 | 10µF ±10% | SAMSUNG_CL21A106KAYNNNE:C0805 | C1, C3, C17, C18, C24, C25 |
| 5 | 100kΩ ±1% | UNI_ROYAL_0402WGF1003TCE:R0402 | R19, R20, R22, R23, R25 |
| 5 | 1µF ±10% | SAMSUNG_CL05A105KA5NQNC:C0402 | C5, C14, C15, C31, C32 |
| 3 | ALPSALPINE_SKRPACE010:KEY-SMD_4P-L4.2-W3.2-P2.20-LS4.6 | SW1, SW2, SW3 | |
| 3 | MountingHole_3_2_M3_Pad:MountingHole_3.2_M3_Pad | H2, H3, H4 | |
| 2 | Hottech_1N5819WS:SOD-323_L1.8-W1.3-LS2.5-RD | D1, D2 | |
| 2 | JST_B2B_PH_K_S_LF__SN:CONN-TH_B2B-PH-K-S | CN1, CN5 | |
| 2 | HONOR_RVT1V101M0607:CAP-SMD_BD6.3-L6.6-W6.6-FD | C12, C13 | |
| 2 | OPSCO_Optoelectronics_SK6805_EC20:LED-SMD_4P-L2.0-W2.0-BR | LED1, LED2 | |
| 2 | CAX_HY2_0_4P_WT:CONN-SMD_HY2.0-4P | CN2, CN3 | |
| 2 | Texas_Instruments_TPS63020DSJR:VSON-14_L4.0-W3.0-P0.50-BL-EP_TI_DSJ | U8, U9 | |
| 2 | 1MΩ ±1% | UNI_ROYAL_0402WGF1004TCE:R0402 | R11, R14 |
| 2 | L 1µH ±20% | cjiang_FHD4020S_1R0MT:IND-SMD_L4.0-W4.0 | L1, L2 |
| 1 | STMicroelectronics_USBLC6_2SC6:SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BL | D3 | |
| 1 | Diodes_Incorporated_74LVC1T45DW_7:SC-70-6_L2.2-W1.3-P0.65-LS2.1-BR | U4 | |
| 1 | JST_S2B_PH_K_S_LF__SN:CONN-TH_S2B-PH-K-S-LF-SN | U6 | |
| 1 | TDK_InvenSense_ICS_43434:MIC-SMD_6P-L3.5-W2.7-P0.90-BL | U5 | |
| 1 | JST_B3B_PH_K_S_LF__SN:CONN-TH_B3B-PH-K-S | CN4 | |
| 1 | Espressif_Systems_ESP32_S3_WROOM_1_N16R8:WIRELM-SMD_ESP32-S3-WROOM-1 | U2 | |
| 1 | BQ25185DLHR_BQ25185DLHR:WSON-10_L2.2-W2.0-P0.40-BL-EP_TI_DLH0010A | U7 | |
| 1 | STMicroelectronics_LSM6DS3TR_C:LGA-14_L3.0-W2.5-P0.50-TL | U3 | |
| 1 | Maxim_Integrated_MAX17048G_T10:TDFN-8_L2.0-W2.0-P0.50-BL-EP1.2 | U10 | |
| 1 | ADI_MAXIM_MAX98357AETE_T:TQFN-16_L3.0-W3.0-P0.50-BL-EP1.5 | U1 | |
| 1 | BHFUSE_BSMD0805_050_15V:F0805 | F1 | |
| 1 | SHOU_HAN_TYPE_C_16PIN_2MD_073:USB-C-SMD_TYPE-C-6PIN-2MD-073 | USB1 | |
| 1 | JST_Sales_America_SM04B_SRSS_TB_LF__SN:CONN-SMD_4P-P1.00_SM04B-SRSS-TB-LF-SN | CN6 | |
| 1 | 102kΩ ±1% | FOJAN_FRC0402F1023TS:R0402 | R12 |
| 1 | 107kΩ ±1% | UNI_ROYAL_0402WGF1073TCE:R0402 | R9 |
| 1 | 10µF ±20% | SAMSUNG_CL05A106MQ5NUNC:C0402 | C16 |
| 1 | 11.3kΩ ±1% | UNI_ROYAL_0402WGF1132TCE:R0402 | R13 |
| 1 | 18kΩ ±1% | UNI_ROYAL_0402WGF1802TCE:R0402 | R8 |
| 1 | 19.1kΩ ±1% | FOJAN_FRC0402F1912TS:R0402 | R10 |
| 1 | 604Ω ±1% | YAGEO_RT0402BRD07604RL:R0402 | R6 |
Questions
How big is the Layouts PCB?
It measures 46 × 0.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Layouts use?
97 parts. 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 Layouts KiCad files?
From the izzyhub/bbr2_pcb repository on GitHub, at the commit this page was made from: the board is layouts/default/default.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Layouts 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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