EOSEFF (Edge Of Space Electronics Form Factor)

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Summary

EOSEFF (Edge Of Space Electronics Form Factor) is a mechanical and electrical specification for components primarily made for Edge of Space 2, but will also be used in a lot of other projects.
Each board measures 75 mm x 45 mm, and can be stacked on other EOSEFF-boards, providing a common I2C-bus and power for all boards.



Make sure you check out the Edge Of Space 2 project, which is the primary application for these boards.

Main board

Overview

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The EOSEFF main board is a key component in the EOSEFF stack. It will do all the onboard processing before data is transmitted to the ground station, and "tie" together all the electronics. A prototype was first milled at NTNU.

Features

The board is made around a PIC24FJ128GA106. Two of the four UARTs can operate at RS-232-levels.
  • EOSEFF form factor
  • 4 x UART (communication with telemetry radio, GPS, AHRS etc.)
  • 1 x SPI (communication with other boards; sensor board, OSD board etc.)
  • 4 x GPIO pins (for general use)
  • 8 x RC servo outputs


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Power supply

Overview

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The EOSEFF PSU was the first board to feature the EOSEFF standard. A prototype was first milled at NTNU.

Features

  • Linear LDO 12 V regulator
  • Switch mode 5 V regulator
  • Linear 3.3 V regulator powered by the switch mode regulator
  • uC providing voltage and current readout


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IO-board

Overview

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The EOSEFF IO-board was made to control power to e.g. radio transceivers, nichrome wires and brushed motors. It can also be powered by a separate power source and serve as a very robust and failsafe timer triggered cutdown-device.

Features and schematic

  • PIC18LF26K22 (can be powered from the EOSEFF bus or external battery through on-board 3.3 V regulator)
  • 2 x high side power outputs (theoretically 8 A) with selectable power source (5V/12V/VBAT/EXT)
  • 2 x low side power outputs (theoretically 20 A) with selectable power source (12V/VBAT/EXT)
  • Dual channel H-bridge with selectable power source (5V/12V/VBAT/EXT)
  • General purpose pins and prototyping area
  • I2C Temperature sensor

Comments



Design: Jon Petter Skagmo