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#apertus IRC Channel Logs

2014/07/07

Timezone: UTC


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fsteinel_
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se6astian
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06:43
se6astian
good morning
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11:16
Bertl
morning folks!
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se6astian
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14:41
se6astian
hello!
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mgielda
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14:49
mgielda
hellp
14:49
mgielda
*hello
14:49
mgielda
wasn't crying for help ;)
14:49
se6astian
hello :D
14:50
Bertl
hey mgielda! how's going?
14:50
mgielda
is Herbert here?
14:50
Bertl
indeed he is :)
14:51
mgielda
hi :)
14:51
mgielda
I should use my nickname instead I suppose
14:51
Bertl
whatever rows your boat ...
14:51
mgielda
changed nick to: thalain
14:52
thalain
I don't know if it rows my boat
14:52
thalain
I don't have a boat :(
14:53
Bertl
okay, so I heard (from sebastian) you want to help with (pre-)Beta development
14:56
thalain
well, if we can
14:57
thalain
depends on where you are. I saw some extra boards in the recent announcement, how about the sensor board itself?
14:57
Bertl
I'm sure you can, we just have to figure out what you would like to do and where you can help best
14:58
Bertl
yes, we did a few test boards for the clock chips and what you probably saw in the announcement a first version of the dual sd board
14:59
thalain
yup
14:59
thalain
so, the sensor board - I heard you did ver1, tested, did some corrections and now, is it in production?
15:00
Bertl
you are talking about the sensor frontend used on the AXIOM Alpha?
15:04
thalain
I thought you wanted to use a different on the beta?
15:04
thalain
i.e. different sensor
15:05
Bertl
yes, indeed, but we didn't make any board for the KAC sensor yet
15:06
thalain
so, are you working now on putting together the original sensor + microzed?
15:08
Bertl
no, not at all, currently we are testing sub-parts of the future AXIOM Beta 'sensor' board, which is more like the main board, i.e. sensor plus certain peripherials plus power supply and connectors for all kind of stuff
15:08
Bertl
give me a second to show you the concept
15:09
Bertl
http://vserver.13thfloor.at/Stuff/AXIOM/BETA/beta_pre03_1024x640.png
15:09
Bertl
what you see in the middle is the Beta board which directly plugs into the microzed
15:11
Bertl
it is supposed to features an FTDI for interfacing and jtag, a PIC32 microcontroller for low speed general I/O, a bunch of sensors and a 'sensor' socket
15:11
Bertl
on the left and the right you can see so called I/O modules which directly plug into the beta board via connectors on the top/bottom
15:18
Bertl
so the main question is, are you more interested in working on the software side or the hardware side (from the discussion so far I'd say hardware :)
15:31
intracube
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15:32
thalain
well, we were kind of looking to speed you up, which is not so easy to do while there is no hardware :) did you start with the Beta board design as such? I see the image so "start" you did, but how advanced are you?
15:33
thalain
the problem is e.g. different tools and such, so I believe it would be hard to help on the hw design itself, but perhaps with e.g. testing and debugging when you have produced the first batch
15:34
Bertl
I think I know what parts we need by now (for the beta board) but we still need to do some testing first I guess
15:34
thalain
we just would need to produce one/two more pieces once the design is done and ship the extra one(s) to us
15:34
Bertl
yes, that is no problem, if you really want to help right now with hardware, then the power supply would be the best place
15:34
thalain
what kind of testing do you have in mind? some pre-Beta boards to test if the parts are OK?
15:36
Bertl
mostly if the parts are suited for the task and if they work as intended
15:36
Bertl
I like to build and test such things systematically :)
15:38
Bertl
so, we did a test board for the dual power supply, and for example, I'm not very happy with the chosen (suggested) components and the overall performance
15:38
Bertl
I'm currently missing the tools (and time) to do systematic testing on variations of the board
15:39
mars_
what's the problem with the power supply?
15:42
Bertl
as you know, we decided to go for a two step regulation, the first one is done by a switching regulator, the second by LDOs to reduce noise
15:43
mars_
yes, i remember that
15:44
Bertl
the existing test board mainly focuses on the switcher
15:44
Bertl
and I went with the suggested part there (basically from the datasheet)
15:45
Bertl
now those parts are somewhat problematic to assemble at home, rather expensive compared to alternatives and seem to give suboptimal performance
15:46
Bertl
so the required testing is twofold:
15:47
Bertl
first, we need to figure out if something is wrong in the design by properly testing the performance of the current layout
15:48
Bertl
and then we need to apply those tests to variations in the components (I already have picked a bunch of alternative parts) to see how they perform
15:49
Bertl
this also includes reducing the noise where possible while keeping it small to fit onto the beta board
15:50
mars_
so, those boards show too much noise?
15:51
Bertl
not just that, they also gave bad performance in the lower input voltag range and with light loads
15:53
danieel
getting good performance in corner cases is more complex than avoiding those corner cases
15:57
Bertl
indeed
15:59
mars_
so, do we need those corner cases?
15:59
Bertl
well, we want to handle a wide input voltage range
15:59
danieel
light load.. solve it by hibernation/quick boot and complete power off
15:59
Bertl
the switcher is designed to work between 5 and 40V, we can probably limit this to 6-35V or so
16:00
Bertl
(although it would be nice to have the 5V input case working)
16:00
danieel
what is the expected consumption?
16:00
Bertl
on the output, we have the microzed and the devices from the Beta board
16:01
Bertl
(including the sendor)
16:02
danieel
in W ? :)
16:05
Bertl
the switcher design is for up to 3W
16:24
thalain
thanks mars_ for asking questions I would have had to ask :) doing too many things at once
16:24
thalain
have to run now but will copy-paste all this to Peter, thanks Herbert for the explanations!
16:25
Bertl
you're welcome!
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fsteinel_
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21:52
se6astian
good night!
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