4 layers45.5 × 69.8 mm
Aero
LtBrain/aero
A control system board/robot for Science Olympiads Robot Tour. It will have 2 brushed motor drivers, at least 2 encoder inputs, and support for ultrasonic and TOF sensors.
53 partsMIT
4 layers45.5 × 69.7 mm
Astrum
LtBrain/astrumA control system board/robot for Science Olympiads Robot Tour. It will have 2 brushed motor drivers, at least 2 encoder inputs, and support for ultrasonic and TOF sensors, all in a compact package.
- Size
- 45.5 × 69.7 mm
- Copper layers
- 4
- Thickness
- 1.61 mm
- Parts
- 77
- Nets
- 69
- Pads
- 323
- Tracks, vias
- 688, 163
- Pours
- 105
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 12 Oct 2025
- Updated
- 31 Mar 2026
Overview
Astrum is an open-source printed circuit board by LtBrain, from the LtBrain/astrum repository on GitHub, published under the MIT licence. It is a 4-layer board of 45.5 × 69.7 mm with 77 parts on 69 nets, routed with 688 tracks and 163 vias.
It is built around the DRV8871DDA, W25Q32JVSSIQ and BSS138DW-7-F-ES, with the LD39015M18R, LDL212PV33R and LSM6DSR among its other parts. Its parts include 21 capacitors, 10 resistors, 10 ICs, 10 connectors and 2 switches. It belongs with the robots and motor control boards and the STM32 boards of this library.
Main components
9
DRV8871DDA
SO-8-EP-40℃~+125℃ 1 10uA 3.6A 565mΩ PWM Yes SO-8-EP Brushed DC Motor Drivers ROHSTexas InstrumentsStepper Motor Driver
W25Q32JVSSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 133MHz 1uA 2.7V~3.6V 20 Years 32Mbit 3ms SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASH
BSS138DW-7-F-ES
SOT-363-55℃~+150℃ 1.5Ω@10V、1.6Ω@4.5V 1V 2 N-Channel 2.2pF 25pF 410mA 417mW 60V 650pC@4.5V 9.7pF N-Channel SOT-363 MOSFETs ROHSElecSuperMOSFETs
LD39015M18R
SOT-23-5-40℃~+125℃@(Tj) 1 1.8V 100mV@(100mA) 150mA 18uA 29uVrms 5.5V 62dB@(10kHz) Fixed Over Temperature Protection、Enable、Short Circuit Protection Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSSTMicroelectronicsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
LDL212PV33R
DFN-6(2x2)-40℃~+125℃@(Tj) 1 1.2A 18V 250uA 3.3V 600mV@(1.2A) 60uVrms 87dB@(120Hz) Fixed Positive Under Voltage Lockout、Over Current Protection、Over Temperature Protection、Enable DFN-6(2x2) Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSSTMicroelectronicsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
LSM6DSR
LGA-14(2.5x3)-40℃~+85℃ 1.71V~3.6V 9KB Accelerometer Gyroscope SPI、I2C、MIPI I3C X,Y,Z X,Y,Z ±16g ±4000dps LGA-14(2.5x3) Accelerometers ROHSSTMicroelectronicsAccelerometers
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
TS-1088-AR02016
SMD,4x3mm-30℃~+80℃ 1.6N 100,000 cycles 12V 2mm 3.9mm 3mm 50mA Black Round Button SMD(SMT) Tab SPST Surface Mount,Vertical Without Bracket SMD,4x3mm Tactile Switches ROHSXUNPUTactile Switches
YC164-JR-0710KL
0603x410kΩ 4 62.5mW 8 ±200ppm/℃ ±5% 0603x4 Resistor Networks, Arrays ROHSYAGEOResistor Networks & Arrays
README
README.mdASTRUM
Astrum was created for the purpose of "placing" at the Mid-Hudson Valley Regionals competition, and to secure Nanuet a medal. Additionally, it serves as an educational tool for other students interested in robotics and control systems. It is able to be programmed in C, as well as Arduino, making it very effective for learning embedded software. This is also practice for myself, testing my design skills with both the hardware, and efficiently programming software to run on said board.
PCB
Wiring Diagram
BOM
Here's the BOM:
| Item # | Name | Link | Amount | Cost |
|---|---|---|---|---|
| 1 | PCB + Assembly + Shipping | jlcpcb.com | 1 order (2 boards) | $170.40 |
| 2 | 25GA-370 Brushed Motors | https://www.aliexpress.us/item/3256807346702379.html? | 2 | $12.94 |
| 3 | Alinan AS5600 Encoder Boards | https://www.aliexpress.us/item/3256809413529733.html? | 1 pack (5 Encoders) | $6.09 |
| 4 | STEMMA QT to Male Header Cable | https://www.aliexpress.com/item/3256805529535394.html? | 2 | $2.78 |
| 5 | 2800 mAh AA NIMH Batteries | https://www.aliexpress.com/item/3256808440628751.html? | 1 pack (12 Batteries) | $7.67 |
| 6 | 4 x AA Battery Holder | https://www.aliexpress.com/item/2255799895517935.html? | 2 | $1.90 |
| 7 | M3 16mm SHCS | M3 SHCS link | 50 | Paid by me |
| 8 | BaneBots T6 Wheel, 2-3/8" x 0.6", Hub Mount | https://banebots.com/t61p-242bp/ | 2 | $6.60 |
| 9 | MF128ZZ Bearings - 8mm x 12mm x 3.5mm | https://www.aliexpress.com/item/3256807566213882.html? | 1 pack (8 bearings) | $6.10 |
| 10 | Polulu 1/2 Inch Metal Ball Caster Wheels | https://www.aliexpress.com/item/3256808387820251.html? | 4 | $4.63 |
| 11 | Pin Headers | https://www.aliexpress.com/item/2255800801798474.html? | 10 | $1.69 |
| Total: | ||||
| $220.80 |
https://github.com/LtBrain/astrum/blob/main/Astrum%20BOM%20-%20Sheet1.csv
This covers the total sum of all the major parts.
There is a more in depth BOM for the PCB assembly components itself: BOM-astrum-JLCPCB Assembly Order.xls
REVIEWERS: Do note that I am aware of the high PCB fabrication costs + shipping, but this is the cheapest I could find it for (at JLCPCB). Additionally, the global standard direct shipping option will not work for this board. Sadly, JLCPCB requires the purchase to be under 59.99 dollars, which this board exceeds. This is why it got so expensive. Also do note that I have optimized my BOMs to be as cheap as possible to lower the amount of money spent by Hackclub.
Parts
77| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | LOGO | LOGO | G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G*** |
| 9 | 100nF | A_HDJ_Library:C_0603_1608Metric | C4, C5, C6, C11, C15, C16, C17, C19, C21 |
| 4 | MountingHole_Pad_MP | MountingHole:MountingHole_2.2mm_M2_ISO7380_Pad | H1, H2, H3, H4 |
| 3 | 10k | Resistor_SMD:R_0603_1608Metric | R8, R9, R10 |
| 3 | 1uF | A_HDJ_Library:C_0603_1608Metric | C9, C12, C13 |
| 2 | clipboard:975089c0-34e4-4fa3-ba18-6809d370517a | , | |
| 2 | 18pF | A_HDJ_Library:C_0603_1608Metric | C7, C8 |
| 2 | 22uF | Capacitor_SMD:CP_Elec_4x5.4 | C18, C20 |
| 2 | 30k | Resistor_SMD:R_0603_1608Metric | R3, R4 |
| 2 | 4.7uF | A_HDJ_Library:C_0603_1608Metric | C3, C10 |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | BSS138DW-7-F | BSS138DW:SOT363_DIO | U7, U10 |
| 2 | Conn_01x04_MountingPin | Connector_JST:JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J5, J6 |
| 2 | Conn_01x05_Pin | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J9, J10 |
| 2 | Conn_01x10_Pin | Connector_PinHeader_2.54mm:PinHeader_1x10_P2.54mm_Vertical | J7, J8 |
| 2 | DRV8871DDA | Package_SO:Texas_HTSOP-8-1EP_3.9x4.9mm_P1.27mm_EP2.95x4.9mm_Mask2.4x3.1mm_ThermalVias | U8, U9 |
| 2 | Screw_Terminal_01x02 | TerminalBlock:TerminalBlock_bornier-2_P5.08mm | J3, J11 |
| 2 | TS-1088-AR02016 | easyeda2kicad:SW-SMD_L3.9-W3.0-P4.45 | SW1, SW2 |
| 2 | YC164-JR-0710KL | YC164-JR-0710KL:RESCAXE80P320X160X70-8N | R5, R7 |
| 1 | 100nF | A_HDJ_Library:C_0402_1005Metric | C22 |
| 1 | 2.2uF | lpddr4-testbed-footprints:C_0402_1005Metric | C2 |
| 1 | 2.2uF | A_HDJ_Library:C_0603_1608Metric | C1 |
| 1 | 25mHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y2 |
| 1 | 4.7k | Resistor_SMD:R_0603_1608Metric | R6 |
| 1 | LD39015M18R | Package_TO_SOT_SMD:SOT-23-5 | U11 |
| 1 | LDL212PV33R | LDL212PV33R:DFN_V33R_STM | U2 |
| 1 | LSM6DSR | LSM6DSR:LGA_M6DSR_STM | U6 |
| 1 | Micro_SD_Card | Connector_Card:microSD_HC_Wuerth_693072010801 | J2 |
| 1 | NSR0530HT3G | Diode_SMD:D_SOD-323 | D3 |
| 1 | STM32H523CEUx | Package_DFN_QFN:QFN-48-1EP_7x7mm_P0.5mm_EP5.6x5.6mm | U1 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U3 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_JAE_DX07S016JA1R1500 | J1 |
| 1 | W25Q32JVSS | Package_SO:SOIC-8_5.3x5.3mm_P1.27mm | U4 |
Questions
How big is the Astrum PCB?
It measures 45.5 × 69.7 mm and has 4 copper layers, 1.61 mm thick.
What parts does the Astrum use?
77 parts, built around the DRV8871DDA, W25Q32JVSSIQ, BSS138DW-7-F-ES and LD39015M18R. 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 Astrum KiCad files?
From the LtBrain/astrum repository on GitHub, at the commit this page was made from: the board is PCB/astrum.kicad_pcb and its schematic PCB/astrum.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Astrum 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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