4 layers98 × 75 mm
PiFinder4
brickbots/PiFinder
A plate solving telescope finder based around a Raspberry PI and RPI HQ Camera
157 parts257GPL-3.0
2 layers50 × 100 mm
Computy
gregora/Computy2Flight computer based on STM32 microcontroller
- Size
- 50 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 47
- Nets
- 89
- Pads
- 216
- Tracks, vias
- 350, 34
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 11 May 2025
- Updated
- 19 Mar 2026
Overview
Computy is an open-source printed circuit board by gregora, from the gregora/Computy repository on GitHub. It is a 2-layer board of 50 × 100 mm with 47 parts on 89 nets, routed with 350 tracks and 34 vias.
It is built around the BNO055. Its parts include 14 capacitors, 6 resistors, 5 connectors, 3 ICs and 2 diodes. It belongs with the STM32 boards of this library.
Main components
1README
README.mdComputy
An STM32 based flight computer
Features
- STM32F205 MCU
- BNO055 IMU and magnetometer
- GNSS via UART
- 6 PWM outputs for servos
- Receiver connection via UART
- 433MHz CC1101 telemetry radio
Hardware
Board specifictions:
- 50mm x 100mm board size
- Four M3 mounting holes
- 25Mhz external oscilator
KiCAD files can be found in /PCB directory.
Firmware
MCU is programmed with CubeIDE. Full project is located in firmware/Computy.
Dependencies
- stm32-nmea-gps-hal (modified and included)
Setup
Before you can build and upload the project to your Computy board, you have to create a coordinates.h header file in firmware/Computy/Core/Inc in which you have to define TARGET_LAT and TARGET_LONG variables.
Because the geolocation is sensitive, this file is included in .gitignore and is thus hidden.
Parts
47| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 100nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2, C3, C4, C5, C6, C10, C11, C12, C13 |
| 6 | Motor_Servo | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | M1, M2, M3, M4, M5, M6 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | H1, H2, H3, H4 |
| 2 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5, R6 |
| 2 | 22pF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C7, C8 |
| 2 | 4.7k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3, R4 |
| 2 | 5.1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2 |
| 2 | D_Schottky | Diode_SMD:D_SOD-323_HandSoldering | D1, D3 |
| 1 | 120nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C9 |
| 1 | 1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C14 |
| 1 | 25MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm_HandSoldering | Y1 |
| 1 | 4.7uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1 |
| 1 | BNO055 | Package_LGA:LGA-28_5.2x3.8mm_P0.5mm | U3 |
| 1 | Conn_01x03_Socket | Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical | J3 |
| 1 | Conn_01x04_Socket | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J4 |
| 1 | Conn_02x04_Odd_Even | Connector_PinSocket_2.54mm:PinSocket_2x04_P2.54mm_Vertical | J5 |
| 1 | Conn_ARM_JTAG_SWD_10 | Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical | J2 |
| 1 | LOGO | LOGO | G*** |
| 1 | NCP1117-3.3_SOT223 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U2 |
| 1 | STM32F205RBTx | Package_QFP:LQFP-64_10x10mm_P0.5mm | U1 |
| 1 | TP_3.3V | TestPoint:TestPoint_THTPad_2.0x2.0mm_Drill1.0mm | TP2 |
| 1 | TP_5V | TestPoint:TestPoint_THTPad_2.0x2.0mm_Drill1.0mm | TP1 |
| 1 | TP_SCL | TestPoint:TestPoint_THTPad_2.0x2.0mm_Drill1.0mm | TP5 |
| 1 | TP_SDA | TestPoint:TestPoint_THTPad_2.0x2.0mm_Drill1.0mm | TP4 |
| 1 | TestPoint_GND | TestPoint:TestPoint_THTPad_2.0x2.0mm_Drill1.0mm | TP3 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_GCT_USB4085 | J1 |
Questions
How big is the Computy PCB?
It measures 50 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Computy use?
47 parts, built around the BNO055. 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 Computy KiCad files?
From the gregora/Computy repository on GitHub, at the commit this page was made from: the board is PCB/Computy.kicad_pcb and its schematic PCB/Computy.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Computy design in my own project?
Its repository states no licence, so its author keeps all rights: ask gregora before reusing the design.
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