HiRel/CanSat

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The [http://en.wikipedia.org/wiki/CanSat CanSat] is a micro-satellite used for [http://www.cansat.eu student competitions] to educate the whole development chain from design until launch of space equipment.
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The [http://en.wikipedia.org/wiki/CanSat CanSat] is a micro-satellite used for [[CanSat/Comptetition|student competitions]] to educate the whole development chain from design until launch of space equipment.
  
 
The CanSat has the form of a soda can with a diameter of 66 mm and a height of 115 mm. The weight is limited to 350 g.
 
The CanSat has the form of a soda can with a diameter of 66 mm and a height of 115 mm. The weight is limited to 350 g.
  
= Demonstrator =
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= PCBs =
This is a demonstrator of the CanSat for use in the HES-SO MSE HiRel module.
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== Layout ==
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[[File:CanSat_FPGA_XBEE_Gumstix_vertical.jpg|thumb|100px|[[HiRel/CanSat|HEI CanSat]]]]
The first big question to solve is, how to get as much PCB real-estate out of such a limited and unusual satellite form-factor.
+
The CanSat demonstrator for the HES-SO MSE [[HiRel|HiRel]] module is made out of 5 vertical boards held together by a bottom and a top interconnect ring.
We decided to go for a vertical solution with 5 PCBs.
+
Furthermore we like to have all PCBs of the same size.
+
This means that the they will be aligned along the central axis in the form of a star or a pentagon.
+
To find the optimal solution we simulated all the possibilities in between these two geometrical figures.
+
  
[[File:Pcb 5 angles.svg|center]]
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== Vertical Boards ==
  
The biggest PCB board surface is attained at an offset of 18° from the pentagon.
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The boards hold the following components:
 +
# an [[HiRel/CanSat/Master_FPGA|FPGA]]
 +
# [[HiRel/CanSat/Slave_Sensors|sensors]]
 +
# an [[HiRel/CanSat/Slave_XBee|XBee module]]
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# a [[HiRel/CanSat/Slave_Gumstix|microprocessor]]
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# a [[HiRel/CanSat/Slave_Power|power converter]]
  
TBD: insert image with curve
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Standard 2x6 pin connectors compatible to the [http://en.wikipedia.org/wiki/Pmod_Interface Pmod™] specification serve as electronic as well as mechanical connection to the interconnect boards.
  
These boards will be hold in place and connected together with two round boards, one on top and one on the bottom.  
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The FPGA board serves as master (or as a router) and therefore connects to all other boards through 4 double [http://en.wikipedia.org/wiki/Pmod_Interface Pmods], two on the bottom side and two on the top side.
 +
Each of the slave boards connects to the FPGA board through 2 [http://en.wikipedia.org/wiki/Pmod_Interface Pmods], one on each side.
  
TBD: insert 3D image/photo
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== Interconnect Boards ==
  
Standard 2x6 pin connectors compatible to the [http://en.wikipedia.org/wiki/Pmod_Interface Pmod™] serve as electronic as well as mechanical connection.
+
Both [[HiRel/CanSat/InterConnect|Interconnect boards]] share the same layout, but with the connectors mounted once on one side ans once on the other.
  
== Vertical Boards ==
+
Each one of the four 6 pin connectors on the master board connect to exactly one slave board.
  
We decided to fill the boards with the following basic components:
+
[[File:Cansat-Interconnect.svg|center|750 px]]
# [[HiRel/CanSat/Master_FPGA|an FPGA]]
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# [[HiRel/CanSat/Slave_Gumstix|a microprocessor]]
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# [[HiRel/CanSat/Slave_XBEE|an XBEE module]]
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# [[HiRel/CanSat/Slave_Sensors|sensors]]
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# [[HiRel/CanSat/Slave_Power|power converters]]
+
  
The FPGA board is a little bit special, as it serves as master and therefore connects to all other boards.
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= Geometry =
Each of the other slave boards only connects to the FPGA board.
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Therefore the FPGA board holds 2 2x6pin connectors on each side whereas the other boards only need one.
+
  
== Interconnect Boards ==
+
The question is, how to get as much PCB real-estate out of such a limited and unusual satellite form-factor.
 +
We decided to go for a vertical solution with 5 PCBs.
 +
Furthermore we like to have all PCBs of the same size.
 +
This means that the they will be aligned along the central axis in the form of a star or a pentagon.
 +
To find the optimal solution we investigated all the possibilities in between these two geometrical figures.
  
Both interconnect boards share the same layout, but with the connectors mounted on the inverse side.
+
[[File:Pcb 5 angles.svg|center]]
Each one of the four 6 pin connectors on the master board connect to exactly one slave board.
+
 
 +
The biggest PCB board surface is attained at a tilt of 18° from the base pentagon.
 +
 
 +
[[File:Pcb surface 5.svg|200 px|center]]
 +
 
 +
These boards are held in place and connected together with two round boards, one on the top and one on the bottom.  
 +
 
 +
[[File:Cansat.jpg|300 px|center]]
 +
 
 +
= Power Consumption =
 +
Following figure shows the power consumption of a CubeSat containing a [[HiRel/CanSat/Master_FPGA|Master FPGA]] and a [[HiRel/CanSat/Slave_Power|Slave Power]].
 +
A sample design has been loaded into the FPGA which lights up LD1 on the [[HiRel/CanSat/Slave_Power|Slave Power]] and oscillates LD2. The oscillation of the LED is the cause of the oscillation visible on the current.
 +
 
 +
[[File:CanSat_power_consumption.PNG|center]]
  
 
[[Category:Master]] [[Category:HiRel]] [[Category:CanSat]]
 
[[Category:Master]] [[Category:HiRel]] [[Category:CanSat]]

Latest revision as of 09:07, 19 June 2018

Contents

The CanSat is a micro-satellite used for student competitions to educate the whole development chain from design until launch of space equipment.

The CanSat has the form of a soda can with a diameter of 66 mm and a height of 115 mm. The weight is limited to 350 g.

PCBs

HEI CanSat

The CanSat demonstrator for the HES-SO MSE HiRel module is made out of 5 vertical boards held together by a bottom and a top interconnect ring.

Vertical Boards

The boards hold the following components:

  1. an FPGA
  2. sensors
  3. an XBee module
  4. a microprocessor
  5. a power converter

Standard 2x6 pin connectors compatible to the Pmod™ specification serve as electronic as well as mechanical connection to the interconnect boards.

The FPGA board serves as master (or as a router) and therefore connects to all other boards through 4 double Pmods, two on the bottom side and two on the top side. Each of the slave boards connects to the FPGA board through 2 Pmods, one on each side.

Interconnect Boards

Both Interconnect boards share the same layout, but with the connectors mounted once on one side ans once on the other.

Each one of the four 6 pin connectors on the master board connect to exactly one slave board.

Cansat-Interconnect.svg

Geometry

The question is, how to get as much PCB real-estate out of such a limited and unusual satellite form-factor. We decided to go for a vertical solution with 5 PCBs. Furthermore we like to have all PCBs of the same size. This means that the they will be aligned along the central axis in the form of a star or a pentagon. To find the optimal solution we investigated all the possibilities in between these two geometrical figures.

Pcb 5 angles.svg

The biggest PCB board surface is attained at a tilt of 18° from the base pentagon.

Pcb surface 5.svg

These boards are held in place and connected together with two round boards, one on the top and one on the bottom.

Cansat.jpg

Power Consumption

Following figure shows the power consumption of a CubeSat containing a Master FPGA and a Slave Power. A sample design has been loaded into the FPGA which lights up LD1 on the Slave Power and oscillates LD2. The oscillation of the LED is the cause of the oscillation visible on the current.

CanSat power consumption.PNG
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