6 layers100 × 100 mm
Imx8x eps leviathan v2
BroncoSpace-Lab/scales-hardware
Hardware design files for the Spacecraft Compartmentalized Autonomous Learning and Edge Computing System (SCALES)
449 parts6
2 layers27 × 27 mm
Squirrelbrain
qwertpas/squirrelbrain1Main control PCB for Pinto robot squirrel
- Size
- 27 × 27 mm
- Copper layers
- 2
- Thickness
- 0.8 mm
- Parts
- 38
- Nets
- 39
- Pads
- 141
- Tracks, vias
- 353, 83
- Pours
- 8
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 2 Jan 2024
- Updated
- 15 Apr 2024
Overview
Squirrelbrain is an open-source printed circuit board by qwertpas, from the qwertpas/squirrelbrain repository on GitHub, published under the MIT licence. It is a 2-layer board of 27 × 27 mm with 38 parts on 39 nets, routed with 353 tracks and 83 vias.
It is built around the RPM5.0-6.0, TPS1HB08BQPWPRQ1 and TPS22992SRXNR, with the SDM2U30CSP among its other parts. Its parts include 8 resistors, 7 ICs, 6 connectors, 5 capacitors and 1 diode. It belongs with the robots and motor control boards and the ESP32 boards of this library.
Main components
4
RPM5.0-6.0
BLGA-25UncategorisedRECOM Power
TPS1HB08BQPWPRQ1
HTSSOP-16-40℃~+125℃ 1 6V~18V 70A 8mΩ Active High High Side Switch Short-Circuit Protection(SCP)、Undervoltage Protection(UVP)、Overcurrent Protection(OCP)、Over Temperature Protection HTSSOP-16 Power Distribution Switches ROHSTexas InstrumentsPower Distribution Switches
TPS22992SRXNR
WQFN-8-HR(1.25x1.25)-40℃~+125℃ 1 1V~5.5V 6A 8.7mΩ Active High Load Switch Short-Circuit Protection(SCP)、Over Temperature Protection WQFN-8-HR(1.25x1.25) Power Distribution Switches ROHSTexas InstrumentsPower Distribution Switches
SDM2U30CSP
X3-WLB1608-2150uA@30V 2A 30V 480mV@2A X3-WLB1608-2 Schottky Diodes ROHSDiodes IncorporatedSchottky Diodes
README
readme.mdSquirrelbrain v2
Main control board for the Pintobotics robotic squirrel. It uses a Seeeduino XIAO ESP32S3 for wireless communication with a base station, is able to drive dynamixel 5V TTL servos up to 6A, and has two separate RS485 buses.
The RS485 buses are intended for:
- Ø32controller, a miniature closed-loop brushless motor driver
- Ø12encoder, a miniature magnetic encoder (MA702)
- Ø12imu, a miniature IMU with built-in sensor fusion for orientation (LSM6DSV)
Squirrelbrain has two load switches to allow the ESP32 to cut off power to the motors when the battery is still connected. One load switch operates an XT30 output, featuring current sensing and a programmed current limit of 38A (limit can be adjusted by replacing a resistor). The other load switch operates on the 5V supply intended for dynamixel servos.
Size: 27mm x 27mm
Mounting: 4x M2 on 32mm diameter circle
Connections:
- 2x JST-SH 2pin connectors for RS485 communication (1 for each bus)
- 2x 4pin 0.5mm pitch double-sided FFC connectors for RS485 communication (1 for each bus)
- 2x solder pads for 3.3V output
- JST-EH 3pin connector for dynamixel TTL
- USB-C on the ESP32S3
- Optional camera module on the ESP32S3
- XT30U-M power in (5-15V)
- XT30U-F power out
- 4pin header for current sense output, extra GPIO, and 5V/GND output
Changelog from Squirrelbrain v1:
Squirrelbrain v1 does not have the FFC connectors and is missing a pullup on the dynamixel data line.
Parts
38| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 10k | Resistor_SMD:R_0402_1005Metric | R2, R3, R5, R6, R7, R8 |
| 6 | TestPoint | squirrelbrain:TestPoint_Pad_Rect | TP1, TP2, TP3, TP4, TP5, TP6 |
| 5 | 100nF | Capacitor_SMD:C_0402_1005Metric | C1, C2, C3, C4, C5 |
| 5 | LOGO | LOGO | G***, G***, G***, G***, G*** |
| 2 | BM02B-SRSS-TB_LF__SN_ | squirrelbrain:JST_BM02B-SRSS-TB_LF__SN_ | J1, J3 |
| 2 | THVD1420DRLR | squirrelbrain:THVD1420DRLR_SOT-585 | U5, U7 |
| 1 | 1k | Resistor_SMD:R_0402_1005Metric | R9 |
| 1 | 390R | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | BATT | squirrelbrain:AMASS_XT30U-M_1x02_P5.0mm_Vertical | J4 |
| 1 | BLDC_PWR | squirrelbrain:AMASS_XT30U-F_1x02_P5.0mm_Vertical | J5 |
| 1 | Conn_01x03 | Connector_JST:JST_EH_B3B-EH-A_1x03_P2.50mm_Vertical | J2 |
| 1 | GPIO1 | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J6 |
| 1 | RPM5.0-6.0 | Converter_DCDC:Converter_DCDC_RECOM_RPMx.x-x.0 | U1 |
| 1 | SDM2U30CSP | squirrelbrain:SDM2U30CSP-7 | D1 |
| 1 | SEEEDUINO-XIAO-ESP32S3 | squirrelbrain:XIAO-ESP32S3-2.54-21X17.8MM | U4 |
| 1 | SN74LVC2G241DCUR | squirrelbrain:SN74LVC2G125DCU | U6 |
| 1 | TPS1HB08BQPWPRQ1 | squirrelbrain:TPS1HB08 | U2 |
| 1 | TPS22992SRXNR | squirrelbrain:TPS22992S | U3 |
Questions
How big is the Squirrelbrain PCB?
It measures 27 × 27 mm and has 2 copper layers, 0.8 mm thick.
What parts does the Squirrelbrain use?
38 parts, built around the RPM5.0-6.0, TPS1HB08BQPWPRQ1, TPS22992SRXNR and SDM2U30CSP. 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 Squirrelbrain KiCad files?
From the qwertpas/squirrelbrain repository on GitHub, at the commit this page was made from: the board is v1/squirrelbrain.kicad_pcb and its schematic v1/squirrelbrain.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Squirrelbrain 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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