Open-source hardware and software for a satellite with a custom on-board computer to interface over I2C, SPI, and UART with a flash chip, IMU, barometer, camera, and thermal sensors. Built to fit within a 1U form factor.
Obc is an open-source printed circuit board by harmalkar, from the harmalkar/satellite-prototype repository on GitHub. It is a 4-layer board of 61 × 45.1 mm with 29 parts on 32 nets, routed with 221 tracks and 24 vias.
It is built around the W25Q32JVSSIQ and LSM6DS3. Its parts include 9 capacitors, 6 resistors, 5 ICs, 4 connectors and 3 diodes. It belongs with the sensors and measurement and interfaces and adapters boards and the STM32 boards of this library.
OpenLST board for SEDS@UMD modified by Nathan Kerns. The latest version of Kicad 6 Nightlies is required to view or modify the design. Recent pdf exports of the PCB and schematic are available in the pdf folder, but may not be completely up to date.
BOM is automatically generated in KiCAD using "bom_csv_grouped_by_value" script, and manually separated into formats seen in bom folder. openlst-bom.csv contains entire BOM, openlst-bom-digikey.csv contains Digikey components, and openlst-bom-mouser.csv contains Mouser components.
3.3 V - 85 mA
4.2 V - 600 mA
430-445 MHz
Constraining component is ASFL1-27MHz at -20 to 70 C
Layers
50 ohm traces
Other traces
This repository contains a KiCad project with a hardware reference implementation for the OpenLST. This design is a simplified version of the Texas Instruments CC1110 432 MHz reference design. A 1 watt power amplifier module has been added to increase operating range. The design is intended for use at 437 MHz, however, it may be modified for use at other frequencies.
The user is responsible for obtaining and maintaining the necessary license to operate this radio. The example project uses frequencies in the US Amateur Radio UHF band. Transmissions in this band require a valid FCC license and compliance with CFR Part 97.
This repository contains the following items:
Copyright 2018 Planet Labs Inc. This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
This document may contain technology or software the export of which is or may be restricted by the Export Administration Act and the Export Administration Regulations (EAR), 15 C.F.R. parts 730-774. Diversion contrary to U.S. law is prohibited.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 100n | Capacitor_SMD:C_0603_1608Metric | C2, C3, C4, C7, C8, C9 |
| 2 | 10u | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C1, C5 |
| 2 | 220 | Resistor_SMD:R_0603_1608Metric | R2, R3 |
| 2 | 4.7k | Resistor_SMD:R_0603_1608Metric | R5, R6 |
| 1 | 100u | Capacitor_THT:CP_Radial_D12.5mm_P5.00mm | C6 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 60 | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | AP1117-33 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U3 |
| 1 | ASE-xxxMHz | Oscillator:Oscillator_SMD_Abracon_ASE-4Pin_3.2x2.5mm | X1 |
| 1 | Blue | LED_SMD:LED_0805_2012Metric | D3 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J1 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | Conn_01x08 | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J3 |
| 1 | Green | LED_SMD:LED_0805_2012Metric | D2 |
| 1 | LSM6DS3 | Package_LGA:LGA-14_3x2.5mm_P0.5mm_LayoutBorder3x4y | U5 |
| 1 | MS5607-02BA | Package_LGA:LGA-8_3x5mm_P1.25mm | U4 |
| 1 | Red | LED_SMD:LED_0805_2012Metric | D1 |
| 1 | STM32L041F6Px | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U2 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | Screw_Terminal_01x02 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J4 |
| 1 | W25Q32JVSS | Package_SO:SOIC-8_5.23x5.23mm_P1.27mm | U1 |
It measures 61 × 45.1 mm and has 4 copper layers, 1.6 mm thick.
29 parts, built around the W25Q32JVSSIQ and LSM6DS3. 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.
From the harmalkar/satellite-prototype repository on GitHub, at the commit this page was made from: the board is obc/obc.kicad_pcb and its schematic openlst/CAN_sheet.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask harmalkar before reusing the design.
harmalkar/satellite-prototype
Open-source hardware and software for a satellite with a custom on-board computer to interface over I2C, SPI, and UART with a flash chip, IMU, barometer, camera, and thermal sensors. Built to fit within a 1U form factor.
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