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| 06:43 | se6astian | good morning
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| 11:16 | Bertl | morning folks!
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| 14:41 | se6astian | hello!
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| 14:49 | mgielda | hellp
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| 14:49 | mgielda | *hello
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| 14:49 | mgielda | wasn't crying for help ;)
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| 14:49 | se6astian | hello :D
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| 14:50 | Bertl | hey mgielda! how's going?
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| 14:50 | mgielda | is Herbert here?
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| 14:50 | Bertl | indeed he is :)
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| 14:51 | mgielda | hi :)
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| 14:51 | mgielda | I should use my nickname instead I suppose
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| 14:51 | Bertl | whatever rows your boat ...
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| 14:51 | mgielda | changed nick to: thalain
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| 14:52 | thalain | I don't know if it rows my boat
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| 14:52 | thalain | I don't have a boat :(
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| 14:53 | Bertl | okay, so I heard (from sebastian) you want to help with (pre-)Beta development
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| 14:56 | thalain | well, if we can
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| 14:57 | thalain | depends on where you are. I saw some extra boards in the recent announcement, how about the sensor board itself?
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| 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
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| 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
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| 14:59 | thalain | yup
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| 14:59 | thalain | so, the sensor board - I heard you did ver1, tested, did some corrections and now, is it in production?
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| 15:00 | Bertl | you are talking about the sensor frontend used on the AXIOM Alpha?
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| 15:04 | thalain | I thought you wanted to use a different on the beta?
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| 15:04 | thalain | i.e. different sensor
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| 15:05 | Bertl | yes, indeed, but we didn't make any board for the KAC sensor yet
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| 15:06 | thalain | so, are you working now on putting together the original sensor + microzed?
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| 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
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| 15:08 | Bertl | give me a second to show you the concept
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| 15:09 | Bertl | http://vserver.13thfloor.at/Stuff/AXIOM/BETA/beta_pre03_1024x640.png
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| 15:09 | Bertl | what you see in the middle is the Beta board which directly plugs into the microzed
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| 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
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| 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
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| 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 :)
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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?
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| 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
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| 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
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| 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
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| 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
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| 15:34 | thalain | what kind of testing do you have in mind? some pre-Beta boards to test if the parts are OK?
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| 15:36 | Bertl | mostly if the parts are suited for the task and if they work as intended
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| 15:36 | Bertl | I like to build and test such things systematically :)
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| 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
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| 15:38 | Bertl | I'm currently missing the tools (and time) to do systematic testing on variations of the board
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| 15:39 | mars_ | what's the problem with the power supply?
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| 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
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| 15:43 | mars_ | yes, i remember that
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| 15:44 | Bertl | the existing test board mainly focuses on the switcher
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| 15:44 | Bertl | and I went with the suggested part there (basically from the datasheet)
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| 15:45 | Bertl | now those parts are somewhat problematic to assemble at home, rather expensive compared to alternatives and seem to give suboptimal performance
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| 15:46 | Bertl | so the required testing is twofold:
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| 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
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| 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
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| 15:49 | Bertl | this also includes reducing the noise where possible while keeping it small to fit onto the beta board
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| 15:50 | mars_ | so, those boards show too much noise?
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| 15:51 | Bertl | not just that, they also gave bad performance in the lower input voltag range and with light loads
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| 15:53 | danieel | getting good performance in corner cases is more complex than avoiding those corner cases
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| 15:57 | Bertl | indeed
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| 15:59 | mars_ | so, do we need those corner cases?
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| 15:59 | Bertl | well, we want to handle a wide input voltage range
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| 15:59 | danieel | light load.. solve it by hibernation/quick boot and complete power off
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| 15:59 | Bertl | the switcher is designed to work between 5 and 40V, we can probably limit this to 6-35V or so
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| 16:00 | Bertl | (although it would be nice to have the 5V input case working)
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| 16:00 | danieel | what is the expected consumption?
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| 16:00 | Bertl | on the output, we have the microzed and the devices from the Beta board
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| 16:01 | Bertl | (including the sendor)
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| 16:02 | danieel | in W ? :)
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| 16:05 | Bertl | the switcher design is for up to 3W
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| 16:24 | thalain | thanks mars_ for asking questions I would have had to ask :) doing too many things at once
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| 16:24 | thalain | have to run now but will copy-paste all this to Peter, thanks Herbert for the explanations!
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| 16:25 | Bertl | you're welcome!
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| 21:52 | se6astian | good night!
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