Current Server Time: 23:35 (Central Europe)

#apertus IRC Channel Logs

2017/03/18

Timezone: UTC


23:16
jucar
joined the channel
23:22
slikdigit__
changed nick to: slikdigit
23:23
arpu
left the channel
23:37
arpu
joined the channel
00:18
RL
joined the channel
00:45
slikdigit
left the channel
00:45
slikdigit
joined the channel
00:57
intracube
changed nick to: intracube_afk
02:00
slikdigit
left the channel
02:05
RL
left the channel
02:40
slikdigit
joined the channel
02:47
Spirit532
left the channel
03:44
jucar
left the channel
03:50
slikdigit
left the channel
04:08
ItsMeLenny
joined the channel
06:29
ItsMeLenny
left the channel
08:14
ItsMeLenny
joined the channel
08:55
Bertl_oO
off to bed now ... have a good one everyone!
08:55
Bertl_oO
changed nick to: Bertl_zZ
09:42
dimaursu16
left the channel
10:04
se6astian|away
changed nick to: se6astian
11:52
Spirit532
joined the channel
12:01
niculescu_vlad
joined the channel
12:01
niculescu_vlad
left the channel
12:29
niculescu_vlad
joined the channel
12:33
niculescu_vlad
left the channel
13:08
ItsMeLenny
left the channel
13:35
fysal
joined the channel
14:33
jucar
joined the channel
14:38
fysal
hi i am abdelrahman fysal, i want to ask about switching regulator, what is meant by control loop?...and switcher? ....and are switching modes(buck,boost ...)?
14:42
niculescu_vlad
joined the channel
14:42
niculescu_vlad
left the channel
15:03
jucar
left the channel
15:05
dimaursu16
joined the channel
15:50
intracube_afk
changed nick to: intracube
16:14
Bertl_zZ
changed nick to: Bertl
16:14
Bertl
morning folks!
16:14
Bertl
hey fysal!
16:18
Bertl
check out the IRC logs, there has been some discussions regarding the smart switcher
16:19
Bertl
http://irc.apertus.org/index.php?day=13&month=03&year=2017
16:39
fysal
left the channel
16:40
Elbehery
joined the channel
16:43
Elbehery
Hey bertl, where can i find info about the control daemon interface?
16:44
Bertl
probably the best soure right now would be BAndiT1983|away when he's around
16:44
Bertl
(currently working on defining the interface)
16:44
Elbehery
Hmmm alright
16:44
Elbehery
I started a simulink environment simulating a mass being heated and a fan cooling it
16:45
Elbehery
i am not at the point of defining a very simple pid controller and inserting it to the fan controller in the simulink environment
16:45
Bertl
s/not/now/?
16:46
Elbehery
but at the moment i am abit confused about the state controlled fan you mentioned earlier like based on what we will decide to stop the fan of being noise
16:46
Elbehery
sorry i meant now*
16:47
Bertl
maybe it would suffice to have different target temperatures and hysteresis values for each state?
16:47
Bertl
like for example, when the camera is 'idle' or when 'between action' and 'recording'
16:48
RexOrCine
IRC Highlights - https://wiki.apertus.org/index.php/IRC_Highlights
16:48
Elbehery
Aha
16:49
Bertl
because ultimately it doesn't make sense to stop the fan despite heat building up or have it running full speed just because nothing is going on, etc
16:51
Bertl
so for example, when the 'operator' decides that 'between shots' the camera should really cool down as good as possible, then setting the temp limit low should achieve that quite well
16:51
Bertl
during a shot, the defaults would simply allow more heat to build up, keeping the system more quiet
16:52
Bertl
but maybe a limit to the fan PWM would be a good idea there too, like a min/max
16:52
Bertl
e.g. keep a 20% min for the fan, but limit it to 50% (unless the system starts to overheat, of course)
16:54
Bertl
(just doing some brainstorming here :)
16:54
Elbehery
Aha, good point. Min and Max values for pwm are set based on the current state and of course as long as the system temp. is within the allowed range am i getting this correctly ?
16:55
Bertl
yes, I don't think that it makes sense to force a max when the camera will shut down or reboot because of overheating
16:56
Bertl
which brings us to the definition of 'safe' themperatures
16:56
Bertl
there will probably be two sets of limits for those for each sensor
16:57
Bertl
something like a 'desired' range in which 'good' performance can be expected
16:57
Bertl
and an 'absolute maximum' range within operation is guaranteed
16:58
Elbehery
Once t is bigger than the absolute maximum temperature should the target temp be adjusted ? or the system will shutdown ?
17:00
Bertl
I'd say at least we need to produce a warning that the system has left the safe operating range
17:01
Bertl
i.e. some kind of alert signal is required and software should check for the reason and act accordingly
17:02
Bertl
note that the controller inside the FPGA does not need to be aware of the different states, they can (and should) be adjusted from userspace
17:03
Bertl
(just in case this wasn't clear)
17:04
Elbehery
Where exactly the alert signal is sent to? i mean is there something like an LED that indicates safe operating mode ? or this is sent to other software?
17:05
Bertl
definitely other software for now
17:06
Elbehery
aha, so the t732 software should also communicate with this software informing it the safe operating modes are not exceeded based on the reading + do the communication with the plant [fan controller]
17:07
Elbehery
+ use the control daemon interface to gather all the reading
17:07
Bertl
I think that would be the best approach for now
17:07
Bertl
at some point, it could even be integrated into the control deamon
17:08
Elbehery
aha
17:10
Elbehery
thanks so much for your time, i will probably send a very simple prototype for the controller once i am done.
17:10
Bertl
excellent! thanks for working on it!
17:11
Bertl
please try to add information to the lab task where it is missing
17:12
Elbehery
great, here is what i think is missing in the lab description
17:13
Elbehery
1- the control algorithm uses the T757 interface to collect the readings, 2- the control alg. decides which mode of operation the system is at, 3- it will report the current mode of operation to another software, 4- it will adjust the fan speed and limit the target temp/ max - min pwm values based on the current state of operation
17:14
Elbehery
I will probably add these in a comment under the T732 link is it okay ?
17:15
Bertl
yes, that's the idea, extend the lab task with information gathered and ideas you have how to improve it ...
17:16
Elbehery
alright
17:31
se6astian
changed nick to: se6astian|away
17:48
slikdigit__
joined the channel
17:52
slikdigit__
changed nick to: slikdigit
18:20
dimaursu16
left the channel
18:33
se6astian|away
changed nick to: se6astian
18:35
dimaursu16
joined the channel
18:35
dimaursu16
left the channel
18:35
dimaursu16
joined the channel
18:53
niculescu_vlad
joined the channel
18:53
niculescu_vlad
left the channel
19:22
niculescu_vlad
joined the channel
19:22
niculescu_vlad
left the channel
19:23
niculescu_vlad
joined the channel
19:23
niculescu_vlad
left the channel
20:05
Elbehery
left the channel
20:16
slikdigit
left the channel
21:05
Elbehery
joined the channel
21:22
se6astian
off to bed
21:22
se6astian
good night
21:23
se6astian
changed nick to: se6astian|away
22:03
slikdigit
joined the channel
22:18
intracube
changed nick to: intracube_afk
22:52
jucar
joined the channel
22:53
Bertl
off for a nap ... bbl
22:53
Bertl
changed nick to: Bertl_zZ