Difference between revisions of "BeagleBone/GeigerCapePrototype"

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== Introduction ==
 +
 +
{|  border="1" cellspacing="0" cellpadding="4"
 +
|- bgcolor="#c0e0e0"
 +
| '''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 <ref name="cape_winner" />
 +
 
== Design ==
 
== Design ==
  
TODO
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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 reduce the need of the pulse extender part of PCB, using a small ceramic capacitor versus 1 uF electrolytic one, and which in turn will reduce "dead time".
  
 
== Software ==
 
== Software ==
  
 
Geiger Cape kernel support is available in Beagleboard.org GitHub tree<ref name="kernel_tree" />.
 
Geiger Cape kernel support is available in Beagleboard.org GitHub tree<ref name="kernel_tree" />.
 +
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):
 +
 +
<pre>
 +
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
 +
</pre>
  
== Multimedia ==
+
=== Hardware ===
[[File:ELCE_Demo_Picture.jpg|center|thumb|450px|ELCE 2012 Demo Picture]]
 
  
; Video Links
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====  Tubes Tested ====
: [https://www.youtube.com/watch?v=507uXzhOjfo Geiger Cape Sample App]
+
'''NOTE:''' These values may change if inductor on future revs is different.
:  [https://www.youtube.com/watch?v=UmDwJCW0uzo CapeBus + Geiger Cape]
+
 
 +
{|  border="1" cellspacing="0" cellpadding="4"
 +
|- bgcolor="#c0e0e0"
 +
| '''Name'''
 +
| '''Status'''
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| '''Duty Percent @ 20kHz'''
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|-
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| LND-712
 +
| Passed
 +
| align="right" | 60%
 +
|-
 +
| SBM-20
 +
| Passed
 +
| align="right" |40%
 +
|}
  
 
== ELC Europe 2012 Presentation ==
 
== ELC Europe 2012 Presentation ==
Line 24: Line 88:
 
|-
 
|-
 
|}
 
|}
 
 
Samples X11 + Python demo scripts + Schematic design:
 
 
: [https://github.com/mranostay/beaglebone-telemetry-presentation Beaglebone Telemetry Presentation Resources]
 
 
  
 
<references>
 
<references>
<ref name="kernel_tree"> [https://github.com/beagleboard/kernel Beaglebone.org GitHub tree]
+
<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] </ref>
 
</references>
 
</references>
 +
 +
[[Category:BeagleBoard]]
 +
[[Category:BeagleBoard Expansion Boards]]

Latest revision as of 02:42, 28 November 2019

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 reduce the need of the pulse extender part of PCB, using a small ceramic capacitor versus 1 uF electrolytic one, and which in turn will reduce "dead time".

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%

ELC Europe 2012 Presentation

Matt Ranostay Beaglebone: The Perfect Telemetry Platform? PDF