HiRel/CanSat/Slave Gumstix

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The CanSat processor platform provides easy access to data processing and storage. It holds a Gumstix Overo® Computer-on-Module (COM) board.

Type CanSat Slave Gumstix Schematic Description
V1.0 CanSat Slave Gumstix V2.0 CanSat Slave Gumstix v2.0 Schematic PDF



The COM board can be powered with 5 V:

When using the micro-USB connector power supply:

  • the jumper close to the the COM board should be shorted
  • the jumper on the power supply board should be open on both sides (5 V from batteries or from mini-USB)


The Gumstix needs an input voltage of 3.3 – 4.2 V DC. Apart from that, little information is given by the manufacturer. Therefore we did some crude tests on our own, with the CanSat Slave Gumstix board directly connected to a laboratory power supply. The test design (developed for the Kart) serves a webpage over WiFi.

The whole setup works fine for voltages higher than 3.2V and it consumes up to 500 mA.


Top and bottom PMOD

A breakout board with the following pins on a standard connector has been created:

Gumstix Breakout IOs
Name Direction Level [V] Description
N_RESET in Gumstix reset, connected to GND via a pushbutton
TXD1 out 3.3 Serial port
RXD1 in 3.3
SPI1 CLK out 3.3 SPI port
SPI1 MOSI out 3.3
SPI1 MISO in 3.3
SPI1 CS0 out 3.3
SPI1 CS1 out 3.3
GND Common
VCC33 in 3.3 Power Supply
USB5 out 5 Power delivered by the USB connector
not used on the breakout board
provided to the connector via a jumper

The USB5 power is connected to the top connector's 5 V pin through a jumper. This poster supply can be used for the whole CanSat system if no power is provided to the power board.

On the power board, the 3.3 V is generated for all the CanSat boards. This is the source of the VCC33 pin which powers the COM board.


The micro-USB connects to an FTDI USB to RS232 bridge. This connects to The Overo's RxD3 / TxD3 pins.

It gives access to the TTY console. Settings are: 115˙200 baud, 8 bit, no parity.


A 4-pin connector on the side of the board connects the audio signals to the Gumstix Overo.

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