Difference between revisions of "BeagleBone/GeigerCapePrototype"

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(ELC Europe 2012 Presentation)
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== Introduction ==
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{|  border="1" cellspacing="0" cellpadding="4"
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|- bgcolor="#c0e0e0"
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| '''Name'''
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| '''Role'''
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|-
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| Matt Ranostay
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| Backup HW design/Userspace applications/Presenter
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|-
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| Dimitris Sapountzakis
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| HW design
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|-
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| Pantelis Antoniou
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| Cape Manager + DT overlay support
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|-
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|}
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Winner of Beagleboard.org Cape Contest <ref name="cape_winner" />
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== Design ==
 
== Design ==
  
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There are demo applications available in the links below.
 
There are demo applications available in the links below.
  
Communication with the cape is using Capemanager + DT overlays driver interface (example output below):
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Communication with the cape is using Pantelis Antoniou's Capemanager + DT overlays driver interface (example output below):
  
 
<pre>
 
<pre>
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'''NOTE:''' These values may change if inductor on future revs is different.
 
'''NOTE:''' These values may change if inductor on future revs is different.
  
{| class="wikitable"
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| '''Name'''
 
| '''Name'''
 
| '''Status'''
 
| '''Status'''
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<references>
 
<references>
<ref name="kernel_tree"> [https://github.com/beagleboard/kernel Beaglebone.org GitHub tree]
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<ref name="kernel_tree"> [https://github.com/beagleboard/kernel Beaglebone.org GitHub tree] </ref>
<ref name="cape_winner"> [http://beagleboard.org/CapeContest/entries/ Beagleboard.org Cape Contest Winners]
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<ref name="cape_winner"> [http://beagleboard.org/CapeContest/entries/ Beagleboard.org Cape Contest Winners] </ref>
 
</references>
 
</references>

Revision as of 20:15, 4 February 2013

Introduction

Name Role
Matt Ranostay Backup HW design/Userspace applications/Presenter
Dimitris Sapountzakis HW design
Pantelis Antoniou Cape Manager + DT overlay support

Winner of Beagleboard.org Cape Contest [1]

Design

The Geiger uses a simple circuit design (see references for schematic) and LND-712 tube but the magic is everything is an extension of Beaglebone + AM335x chip:

  • PWM controls the boost converter
  • Analog (AIN) feedback reports back current voltage of boost converter
  • GPIO interrupts for radiations events

Future design work (some in progress):

  • Fix current limiter with op-amps
  • Use resistors that are within spec
  • eCAP support to get rid of pulse extender part of PCB

Software

Geiger Cape kernel support is available in Beagleboard.org GitHub tree[2]. There are demo applications available in the links below.

Communication with the cape is using Pantelis Antoniou's Capemanager + DT overlays driver interface (example output below):

Confirm Cape Manager picked up device
	# cd /sys/devices/ocp.2/bone-cape-geiger.11

	(start running)
	# echo 1 > run

	(power LED turns on and the event LED lights up on a “click”)

Display counts:
	# cat counter
	4344

Display VSENSE (voltage feedback loop) in Millivolts:
	# cat vsense
	538004

Hardware

Tubes Tested

NOTE: These values may change if inductor on future revs is different.

Name Status Duty Percent @ 20kHz
LND-712 Passed 60%
SBM-20 Passed 40%

Multimedia

ELCE 2012 Demo Picture
Video Links
Geiger Cape Sample App
CapeBus + Geiger Cape

ELC Europe 2012 Presentation

Matt Ranostay Beaglebone: The Perfect Telemetry Platform? PDF


Samples X11 + Python demo scripts + Schematic design:

Beaglebone Telemetry Presentation Resources