2 layers74 × 240 mm
2 layers93 × 56 mm
Auxiliary board
akshatbansaltech/Light-Doggo1- Size
- 93 × 56 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 33
- Nets
- 81
- Pads
- 229
- Tracks, vias
- 433, 48
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 14 Aug 2026
- Updated
- 4 Sep 2026
Overview
Auxiliary board is an open-source printed circuit board by akshatbansaltech, from the akshatbansaltech/Light-Doggo repository on GitHub, published under the MIT licence. It is a 2-layer board of 93 × 56 mm with 33 parts on 81 nets, routed with 433 tracks and 48 vias.
It is built around the SN74LVC1G14DBV, BSS138 and MMBT2222A. Its parts include 12 resistors, 10 connectors, 3 transistors, 2 ICs and 1 switch.
Main components
3
SN74LVC1G14DBV
SOT-23-5-40℃~+85℃ 1 1 1.16V~3.33V 1.65V~5.5V 10uA 2.3V 32mA 32mA 390mV~1.87V 550mV 6.5ns@2.5V,50pF 74LVC Schmitt trigger 电源关断保护、噪声抑制功能 SOT-23-5 Inverters ROHSTexas InstrumentsInverters
BSS138
SOT-23-55℃~+150℃ 1 N-channel 1.1Ω@10V、1.2Ω@4.5V 1.2V 1.7nC@10V 17.5pF 340mA 350mW 50V 6.5pF N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETsMMBT2222A
SOT-23-55℃~+150℃ 1 NPN 100 100nA 1V 300MHz 300mW 40V 600mA 6V NPN Standalone SOT-23 Bipolar (BJT) ROHShongjiachengBipolar (BJT)
README
pcbs/auxiliary-board/README.mdTODO / Fixes
- Add version number to silkscreen
- Change terminal footprint to match the now used terminal: WM7877-ND
- Add a switch for WiFi AP/Client switching
- LCD holes are not aligned and are off slightly
- Change 40 pin header from SMD to through-hold
- Consider adding a second tactile button
General Thoughts
-
Removing the Black Pill in favor of using a STM32 directly on the board will save space and allow the addition of more breakouts such as buttons.
-
Removing the LCD PCB and directly connecting a LCD to the board will reduce the height of the board that will decrease the chance of screen damage when the quadruped rolls over.
Parts
33| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 10k | Resistor_SMD:R_1206_3216Metric | R2, R4, R5, R6, R7, R8, R10, R11, R12 |
| 5 | Conn_01x03 | Connector_JST:JST_ZH_B3B-ZR_1x03_P1.50mm_Vertical | J3, J4, J5, J10, J11 |
| 2 | 500 | Resistor_SMD:R_1206_3216Metric | R3, R9 |
| 2 | BSS138 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2 |
| 1 | BNO055_Module | general:BNO055 Module | MOD1 |
| 1 | Conn_01x02 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_PT-1,5-2-3.5-H_1x02_P3.50mm_Horizontal | J1 |
| 1 | Conn_01x04 | Connector_JST:JST_ZH_B4B-ZR_1x04_P1.50mm_Vertical | J7 |
| 1 | Conn_01x05 | Connector_JST:JST_ZH_B5B-ZR_1x05_P1.50mm_Vertical | J9 |
| 1 | Conn_02x04_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x04_P2.54mm_Vertical | J8 |
| 1 | Jumper_3_Open | Jumper:SolderJumper-3_P1.3mm_Open_Pad1.0x1.5mm | JP1 |
| 1 | LOGO | graphics:electroPup-graphic-20mm | G*** |
| 1 | MMBT2222A | Package_TO_SOT_SMD:SOT-23 | Q3 |
| 1 | R_Small_US | Resistor_SMD:R_1206_3216Metric | R1 |
| 1 | Raspberry Pi - Hat Template - Full Size | sbcs:Raspberry Pi - Hat Template - Full Size Extended | J2 |
| 1 | SN74LVC1G14DBV | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm_H4.3mm | SW1 |
| 1 | YAAJ_WeAct_BlackPill_Part_Like | mcus:Blackpill WeAct | U1 |
| 1 | ~ | general:PB-09N23P-03Q_MAL | LS1 |
| 1 | ~ | displays:LCD-Display-1.8-128x160-Hiletgo | DISP1 |
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Questions
How big is the Auxiliary board PCB?
It measures 93 × 56 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Auxiliary board use?
33 parts, built around the SN74LVC1G14DBV, BSS138 and MMBT2222A. 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 Auxiliary board KiCad files?
From the akshatbansaltech/Light-Doggo repository on GitHub, at the commit this page was made from: the board is pcbs/auxiliary-board/auxiliary-board.kicad_pcb and its schematic pcbs/auxiliary-board/auxiliary-board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Auxiliary board 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).