#apertus IRC Channel Logs

morning

good morning

sebastian closed T160: invite all crowd funding backers to the lab as "Resolved". http://lab.apertus.org/T160

grab this rope!

control concept v3: https://lh4.googleusercontent.com/-esn_bhh1MXw/VIWbLKA8VkI/AAAAAAAAA-o/nxk0HUotv94/w750-h562-no/apertus_control_v3e_processed4.jpg

back

morning folks!

Adobe sent a draft for extending the cinemadng standard with some new tags for camera manufacturers

I see for example that they offer tags like cameraPosition v3f (3 floats)

I am not familiar with the standard though so I dont know what changed compared to the last approved standard

but I am sure we can research the changes if we consider it worth the effort

se6astian: I'm not familiar with the standard either, you might want to get Gabe involved

I know we wont write raw cinema dng data that soon

but considering its the only widely supported AND open raw standard and they ask us to participate in it we should consider it carefully :)

Konstantin: so, IIRC, you want to help with electronic design?

well, sounds good to me, are you already familiar with the current designs?

let's hear what you figured out on your own so far and please do not hesitate to comment or critizise

I have to say im a heavy analog guy not that i know nothing about digital but im not so into programming unfortunately

yes, indeed, that's why I'm always interested in feedback

yup Power management would be something and i thing that is portably easier to integrate

im open to every thing ;)

i think too

we've done some successful test with a switching regulator to cover the 6-35V range so far

ok but the rage is not that difficult

depends on the specs, of curse

the interface board (which goes between sensor and Beta board) has another two voltages

at least two of the sensor voltages need to be capable of up to 1.5A

probablythe biggest issue would proabably be the space for the differnt supplies

witch powerlevels are involved like over all for the sensor Supply etc

the interface board will most likely require 1.8 to 3.3V

is there currently a spreadsheet witch the "needed" supplies and there raitings?

if you check out the CMV12000 datasheet, you will see a list for this particular sensor

yes, the sensor supply must be low noise (i.e. well conditioned and filtered)

ok but the good thing is that the supply powere is not that big so that makes it easy

ok the limits have to be set by the software and the rest is up to the control loop of the supply

so basically the sensor tells the power supply (with two signals) that a provided voltage is over or under the desired range

and if that is the case, no power will be supplied to the sensor

the circuitry on the sensor board

http://vserver.13thfloor.at/Stuff/AXIOM/BETA/axiom_beta_sensor_cmv12000_v0.12.pdf

ok then we have to be carefull not to disturb the control loop

please reload, it should now contain all pages

ok u will use different refs

and then generate over/under voltage signals accordingly

ok over that u can get the conditions

yes, the process is like this:

the beta board checks for the eeprom and reads the identification as well as the ranges and default voltages

the sensor board immediately checks the voltages and gives the okay feedback via over/under voltage signals

i.e. the beta board can now enable the actual voltages to the sensor

jup ok

(i.e. new phase of power sequencing)

within the ranges, the power subsystem should do the best to regulate the voltage

correct, that's the idea behind it

I had a simpler concept first, which basically used power mosfets to short-circuit in overvoltage conditions (which would be harmless because of the current limited supply) but I decided to choose a more complex but also more flexible design instead

i know both solution if ur power supply is well enough design u can switch fast enough

the complexer one is often used in expensive gear

great! then let's get started! :)

how many people are actually working on the beta itselve

maybe more precise on the hardware?

is probably easier to answer

so for coordination, checking with me is probably more then enough

one good thing is that u are using eagle too

yeah, Eagle is more a left over here, we still plan to switch to KiCad at some point, but I've been using Eagle for a long time now and thus I'm very comfortable with it

is there any like FTP were i can find projects Documents and stuff?

you can find the designs either on my server (http://vserver.13thfloor.at/Stuff/AXIOM/BETA/) or on github (once I checked them in :)

ok maybe it would be a idear to work out a hole powere plan makes designing much easier

it is probably better if we talk about these things. IRC could be a bit involved,

ok

maybe somebody even starts transcribing the ideas to the wiki at some point, which would save us spending more time on documentation

great!

se ya all

bye all

se6astian: are you subscribed to some DNG mailing list or did adobe approach you directly?

mailing list

which email address should I subscribe?

christophvarga created T216: phabricator, communication, web, basic understanding of this interface. http://lab.apertus.org/T216

good night!