Auxiliary board
About the Auxiliary board
Auxiliary board is an open source Raspberry Pi PCB design by reubenstr, published on GitHub. It is a 2-layer board measuring 93 × 56 mm, with 31 components from 17 distinct parts.
Its main chip is the Raspberry Pi - Hat Template - Full Size, from the Raspberry Pi family. Other key parts include the YAAJ_WeAct_BlackPill_Part_Like, SN74LVC1G14DBV and BNO055_Module. By type, the board carries 12 resistors, 10 connectors, 3 transistors, 2 ICs, 1 module and 1 speaker.
It belongs with the robotics & motion designs in this gallery.
From the project
DIY 3D printed quadruped robot.
- 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
- 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.
Main components on the Auxiliary board
Auxiliary board bill of materials (BOM)
31 components, 17 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | YAAJ_WeAct_BlackPill_Part_Like | Blackpill WeAct | U1 |
| 1 | SN74LVC1G14DBV | SOT-23-5 | U2 |
| 1 | BNO055_Module | BNO055 Module | MOD1 |
| 2 | BSS138 | SOT-23 | Q1, Q2 |
| 1 | MMBT2222A | SOT-23 | Q3 |
| 1 | Conn_01x02 | TerminalBlock_Phoenix_PT-1,5-2-3.5-H_1x02_P3.50mm_Horizontal | J1 |
| 1 | Raspberry Pi - Hat Template - Full Size | Raspberry Pi - Hat Template - Full Size Extended | J2 |
| 5 | Conn_01x03 | JST_ZH_B3B-ZR_1x03_P1.50mm_Vertical | J3, J4, J5, J10, J11 |
| 1 | Conn_01x04 | JST_ZH_B4B-ZR_1x04_P1.50mm_Vertical | J7 |
| 1 | Conn_02x04_Odd_Even | PinHeader_2x04_P2.54mm_Vertical | J8 |
| 1 | Conn_01x05 | JST_ZH_B5B-ZR_1x05_P1.50mm_Vertical | J9 |
| 1 | ~ | LCD-Display-1.8-128x160-Hiletgo | DISP1 |
| 1 | ~ | PB-09N23P-03Q_MAL | LS1 |
| 1 | SW_Push | SW_PUSH_6mm_H4.3mm | SW1 |
| 1 | R_Small_US | R_1206_3216Metric | R1 |
| 9 | 10k | R_1206_3216Metric | R2, R4, R5, R6, R7, R8, R10, R11 +1 |
| 2 | 500 | R_1206_3216Metric | R3, R9 |
Auxiliary board design files
The KiCad project lives in the reubenstr/ElectroPup repository on GitHub; these links point at the commit this page was built from.
Auxiliary board: common questions
What microcontroller does the Auxiliary board use?
The Auxiliary board is built around the Raspberry Pi - Hat Template - Full Size, from the Raspberry Pi family.
How big is the Auxiliary board?
The Auxiliary board measures 93 × 56 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Auxiliary board?
31 components, from 17 distinct parts. The full bill of materials is listed on this page.
Where can I download the Auxiliary board design files?
From the reubenstr/ElectroPup repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Auxiliary board design in my own project?
The repository has no license, so all rights stay with reubenstr. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Auxiliary board without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Raspberry Pi firmware against it before you order a PCB.
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