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Systems / On-Board Computer

On-Board Computer

Command and data handling for nanosatellite missions.

EOS-OBC-DSH-04 / Flown on LOGSATS-2

On-Board Computer flight unit render
Processor
Arm Cortex-M4, 80 MHz
Flight software
MicroPython v1.23
Interfaces
CAN, UART, SPI, I2C, USB
Mass
150 g

Overview

The EOS Orbit OBC runs command and data handling for nanosatellite missions: telecommand processing, telemetry collection, logging, and coordination of subsystems over the satellite bus. The module starts on power and operates at 0.3 W in normal mode.

Flight software runs in MicroPython on an Arm Cortex-M4. Mission teams write and revise flight logic in readable code, against a library set covering CAN, UART, SPI, I2C, USB, temperature monitoring, and logging to external storage.

Features

  • Arm Cortex-M4 32-bit at 80 MHz
  • MicroPython v1.23 flight software environment
  • 1 MB program memory, 320 KB SRAM
  • External storage expandable to 64 GB
  • CAN, UART, SPI, I2C, and USB interfaces
  • Start-on-power, 0.3 W typical consumption
  • PC-104 form factor
  • Optional Cortex-M7 upgrade, 8 Mbit FRAM, RTC, 3-axis magnetometer, extended RS-485/RS-422 interfaces

Specifications

Processing

Processor Arm Cortex-M4 32-bit, 80 MHz
Program memory 1 MB
SRAM 320 KB
External storage Up to 64 GB
Language MicroPython v1.23

Electrical

Supply 5.0 V nominal
Power, normal mode 0.3 W typical, 0.5 W max
Operating temperature -40 to +80 °C

Physical

Size 92 x 94 x 23.24 mm
Mass 150 g
Mounting PC-104 stack, 4x M3
Enclosure Aluminum 6061

Qualification

Thermal vacuum 8 cycles, -20 to +60 °C, < 10⁻⁵ Torr, 1 h dwell at extremes
Radiation TID evaluated to 20 krad (Si), SEE tolerance, latch-up protection
Random vibration 14.1 gRMS, 20-2000 Hz
Functional burn-in 72-96 h continuous operation in vacuum

Mechanical

On-Board Computer mechanical drawing
92 x 94 x 23.24 mm / 4x M3 / dimensions in mm

Heritage

Flown on LOGSATS-2. Launched January 15, 2025, on a SpaceX Falcon 9. 440 days of orbital operations.

Commission this system

Write to contact@eosorbit.com with your mission parameters. The engineering team responds with configuration options, lead time, and test documentation.

Contact engineering →

EOS-OBC-DSH-04 / datasheet on request