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 Schematic PDF |
Power
Supply
The COM board can be powered with 5 V:
- via the micro-USB connector
- via the CanSat power supply board
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)
Consumption
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.
Connectors
Top and bottom PMOD
A breakout board with the following pins on a standard connector has been created:
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.
USB
The micro-USB connects to an FTDI USB to RS232 bridge. This connects to The Overo's RxD3 / TxD3 pins.
Audio
A 4-pin connector on the side of the board connects the audio signals to the Gumstix Overo.