Difference between revisions of "BeagleBone/GeigerCapePrototype"
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<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 name="cape_winner"> [http://beagleboard.org/CapeContest/entries/ Beagleboard.org Cape Contest Winners] | ||
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Revision as of 20:58, 4 February 2013
Contents
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[1]. There are demo applications available in the links below.
Communication with the cape is using 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
- Video Links
- Geiger Cape Sample App
- CapeBus + Geiger Cape
ELC Europe 2012 Presentation
Matt Ranostay | Beaglebone: The Perfect Telemetry Platform? |
Samples X11 + Python demo scripts + Schematic design:
- ↑ Cite error: Invalid
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