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#apertus IRC Channel Logs

2017/03/20

Timezone: UTC


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se6astian|away
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07:16
Bertl_oO
morning se6astian!
07:17
Bertl_oO
changed nick to: Bertl
07:35
se6astian
hello!
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anuditverma
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07:58
Bertl
wb anuditverma!
08:09
anuditverma
Hello Bertl :)
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Tanos
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08:16
Bertl
welcome Tanos! welcome Christofpap!
08:19
Christofpap
Hello Bertl! I spoke with Herbert Poetzl that the T728 had one other person, so i could help on this subject
08:20
Bertl
correct, the former is me and the latter is se6astian :)
08:21
Christofpap
Also i interested for T732, could you tell me more details for this because i think that i can help on this subject
08:21
Christofpap
thank you!
08:23
Bertl
well, what would you like to know?
08:24
Bertl
and maybe let's hear how you interpret those tasks and how you would go about solving them?
08:33
Christofpap
i had implemented this circuit with fan(https://www.youtube.com/watch?v=ng-OwJeXQxE) and i will implement it with the similar way but with VHDL on FPGA
08:36
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08:40
Bertl
well, the microcontroller approach won't work on the FPGA
08:41
Bertl
you also need to incorporate a number of sensors not directly connected to the FPGA and user preferences for this task
08:41
Bertl
so basically it consists of a PWM controller attached via e.g. I2C or SPI and remote accessed via the main FPGA (ZYNQ)
08:42
Bertl
the control loop probably should be running on the ARM cores inside the ZYNQ and retrieve the sensor values from the control daemon
08:43
Bertl
how about T728?
08:47
Christofpap
the scope of T728 is the creating a image sensor without using a actual sensor?
08:47
Bertl
correct, at different levels
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08:50
Tanos
Hi Bertl! I am interested for T726, T722, T734, T720. For task T726 I don’t have the required skills for the FPGA implementation, is there any chance getting it? I am asking because it is labeled as  optional .
08:50
Bertl
quite a number of tasks, let me check what they are :)
08:52
Bertl
T720 and T726 you want to talk with se6astian or alexML
08:52
Christofpap
In the original data file i will run machine learning algorithms for classification and i will have some classes as patterns. The same way i will do in the fakes data and i will compare them
08:52
Bertl
Tanos: T722 you probably best chat with BAndiT1983|away when he's around
08:52
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08:53
Bertl
Christofpap: do you have experience with FPGAs and HDL coding? maybe any example code you wrote?
08:54
Bertl
Tanos: for T734 you are right with me and alexML :)
08:54
Christofpap
Yes, my thesis was with FPGA and VHDL coding
08:55
Bertl
Tanos: regarding the FPGA part, sure you can acquire the skills for that, but I would check first if that is something you want to do
08:55
Bertl
Christofpap: any links/URLs?
08:59
Christofpap
https://drive.google.com/open?id=0Bw4975seDipbWWpKWWhJYzhXN00 be in Greek, thes subject is how to connect with bluetooth module on a SMA Inverter(Inverter of Solar Panel) and how to retrieve data of it with FPGA and arduino
09:01
Tanos
Great thank you. I have no experience with FPGAs and I don’t know if it is possible to acquire all the skills needed to complete the task. On the other hand FPGAs is within my field of interest and I plan on investing time learning the craft.
09:04
Bertl
well, I know for sure that half a year is more than enough to learn a HDL and how to progam FPGAs and use that to get a working cinema camera prototype done :)
09:06
Bertl
Christofpap: did you code both the RX.VHD as well as the TX.VHD?
09:09
Christofpap
yes, in these files i wrote a procedure to send bytes (depending baud rate) to bluetooth module via RS232 port
09:09
Christofpap
and in the RX.VHD the inverse way
09:10
Tanos
If that’s the case then I will be more than happy learning it. How do you think I should state it in my application? (That I have no FPGA skills but I am currently developing my skills and knowledge?)
09:14
Bertl
Christofpap: and why do they look so different in capitalization and indentation?
09:14
Bertl
Tanos: sounds good to me
09:16
Bertl
also note, that even if GSoC does not happen for motivated folks, contributions are still welcome and we will figure out a way to compensate those
09:17
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09:17
Christofpap
Sorry, but i don't understand you
09:18
Bertl
well, in a thesis, I would expect you to have some kind of coding style and to adhere to it
09:18
Bertl
now looking at page 52 and 53 I see all lower case and indentation for port signals
09:19
Bertl
but then, the RX.VHD suddenly is all uper case and no indentation in the entity definition at all
09:20
Bertl
so for me it looks more like it came from two different sources
09:23
Tanos
That's so good to hear Bertl! Thank you for the info.
09:24
Christofpap
Ok, i understand it was i way to understand better the code with my professor. Because i would like to do two times the same way. It was a convension with my professor
09:28
Bertl
so what are your questions regarding the tasks you're interested in?
09:32
Christofpap
If i could help on this subject
09:32
Christofpap
thank you!
09:37
Bertl
as I said, all help is welcome, so go ahead and start contributing
09:38
Christofpap
thank you!
09:39
Bertl
you're welcome!
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10:12
niculescu_vlad
Hello!
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niculescu_vlad
Mr. Bertl?
10:12
Bertl
hey niculescu_vlad!
10:12
Bertl
welcome Xumerio
10:13
Xumerio
Thanks
10:13
niculescu_vlad
I we had a discussion on T732 five days ago
10:14
niculescu_vlad
I want to know if you came with new considerations
10:14
niculescu_vlad
till that moment, temperature sensors were the only input in the algorithm
10:15
Bertl
we had a discussion here on IRC a few days ago (check the logs for details) about the control loop
10:15
niculescu_vlad
Furtheremore, as you said, the problem with fan is that it will produce noise sounds that will affect the recording
10:16
niculescu_vlad
I want to propose my own idea, to design an noise canceling adaptive filter that will reject that noise
10:16
niculescu_vlad
what do you think?
10:16
Bertl
interesting, go on ...
10:17
niculescu_vlad
Ok. The noise produced by the fan is almost constant and easy to distinguish. Taking some recordings and training an algorithm can result in impresssive results
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10:18
niculescu_vlad
and the FPGA is very good for digital filters. Especially high order filters, because the adders work in parallel
10:18
Bertl
well, there is one problem though, audio is normally recorded with separate equipment
10:19
niculescu_vlad
but is that equipment close to the camera?
10:19
niculescu_vlad
to the fan
10:19
Bertl
but it is a good idea to collect information about the fan (and record it somewhere) to compensate in post
10:19
Bertl
(post = post production)
10:19
niculescu_vlad
anyway, further processing can be done
10:19
niculescu_vlad
yes
10:20
niculescu_vlad
And about the Fan Application.
10:20
Bertl
yes?
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10:22
niculescu_vlad
All users proposed to use a PID control. Which is quite easy to implement. I suppose the input depends on the sensors values, and their distance from the fan. But I am thinking at a better idea. A machine learning approach. Trained with sensors values, distances, and the appropriate fan speed (PWM vlaue)
10:22
niculescu_vlad
In this way, it can learn what PWM should generate for the fan when specific sensors values are received
10:23
niculescu_vlad
it can provide better results than the PWM, as it can model the nonliniarities better
10:23
niculescu_vlad
it is just an idea
10:23
niculescu_vlad
it deserves to be taken into account
10:23
Bertl
an interesting idea, not sure it isn't overkill though
10:24
Bertl
one aspect I think is very important is that there need to be different 'modes' with different limits and target temperatures
10:24
niculescu_vlad
No, it isn't. A quite small training data set can be suffiecient. (around 30-40 samples)
10:25
Bertl
e.g. you typically want a 'silent' operation during a shot, which doesn't really take that long (normally a few minutes)
10:25
Bertl
then you can cool at full power between two shots
10:26
Bertl
and you want to keep a good but not annoying 'cool' during longer idle periods
10:26
niculescu_vlad
yes. A research should be done to investigate how temperature ranges during a shot
10:27
Bertl
in all cases we want to keep 'acceptable' temperatures in all places and warn if we go over
10:27
niculescu_vlad
yes. The algorithm has to act like a switch-case function
10:28
niculescu_vlad
And all the measurements should be done in warm environments, too. It might work at 17 degrees celsius, but it won't work for 25
10:28
niculescu_vlad
Just an example
10:32
Bertl
yup
10:32
Bertl
maybe add your ideas to the lab task
10:33
niculescu_vlad
Ok
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Captain_Rubik
Hi
13:18
Bertl
hey
13:18
Captain_Rubik
Where can I find GSOC ideas for this organisation?
13:18
Captain_Rubik
TIA
13:19
Bertl
here: https://lab.apertus.org/project/view/20/
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Bertl
welcome rock!
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Bertl
wb Xumerio!
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Xumerio
:)
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derWalter
off now
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Bertl
off for now ... bbl
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se6astian
off to bed
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se6astian
good night
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se6astian
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Bertl_oO
nn
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