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by HowardP
Mon Jun 10, 2013 6:01 pm
Forum: Advanced users
Topic: SD activity after power off
Replies: 13
Views: 2515

Re: SD activity after power off

pjlandry" wrote : So, bottom line... Be safe, don't kill power as soon as GPIO goes down. Thanks all. One after thought - it would be interesting to try a brute force test a few times - might need to burn a few sdcards though :o. As you're probably now planning to do: start writing a large file imm...
by HowardP
Mon Jun 10, 2013 5:41 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: 0-10v PWM possible?
Replies: 36
Views: 11885

Re: 0-10v PWM possible?

cyrano wrote: 0-10V is a[n ...] older standard [ ...] in stage lighting [...] Everything is DMX nowadays, but still, lots of older 0-10V dimmer packs around theatres. True. I've had to work on (too) many of them. :cry: Spiffly, if you want real help, please get us the info everyone's asking for: a ...
by HowardP
Mon Jun 10, 2013 4:53 pm
Forum: Camera board
Topic: Camera focus distance and macro lenses
Replies: 71
Views: 58986

Re: Camera focus distance and macro lenses

Thanks poing and jbeale for the workable solutions and additional resources. Indeed it would be better to avoid a moving system. 8 cm might be OK; am still looking at options. Yes, I will have to fiddle with it, if we commit to the Pi / cam. combination. I will certainly post my results ! I have ano...
by HowardP
Mon Jun 10, 2013 4:23 am
Forum: Camera board
Topic: Camera focus distance and macro lenses
Replies: 71
Views: 58986

Re: Camera focus distance and macro lenses

Interesting trade offs. So imagine the camera pointed downward, parallel to the surface holding the object. If a servo-motor or a stepper motor could move the whole camera assembly up and down, how many images do you think it would take, say, to move through that 1 cm field ? (That'd also determine ...
by HowardP
Sun Jun 09, 2013 1:39 am
Forum: Camera board
Topic: Camera focus distance and macro lenses
Replies: 71
Views: 58986

Re: Camera focus distance and macro lenses

rkinch wrote: [ ... ] an excellent close-up lens : http://www.surplusshed.com/pages/item/pl1047.html jbeale wrote: [ ... ] a +3 lens has a focal length of 0.33 meters (33 cm). [ Diopter: ] http://en.wikipedia.org/wiki/Dioptre Thanks ! Your links and explanations are the starting point I needed. Coo...
by HowardP
Fri Jun 07, 2013 8:41 pm
Forum: Camera board
Topic: Camera focus distance and macro lenses
Replies: 71
Views: 58986

Re: Camera focus distance and macro lenses

Despite their name "All Electronics" [ ... ] Great find, jbeale ! Thanks ... another cool gadget / gizmo store bookmarked ... Those lens look pretty similar to the lens in the cheapo magnifying glasses I mentioned. One more question, please: Since you jumped right to " +3 diopter " based on my simp...
by HowardP
Fri Jun 07, 2013 8:03 pm
Forum: Deutsch
Topic: Suche Partner (Programmierer)
Replies: 3
Views: 1074

Re: Suche Partner (Programmierer)

Es klapt nicht :-\ We are sorry, but you are not authorised to use this [PM] feature. You may have just registered here and may need to participate more to be able to use this feature. Anschient wäre dass gleiche umgekehrt auch nicht funktionieren - keine Lesbarkeit |-) Bin ich trotzdem interessiert...
by HowardP
Fri Jun 07, 2013 7:50 pm
Forum: Camera board
Topic: Camera focus distance and macro lenses
Replies: 71
Views: 58986

Re: Camera focus distance and macro lenses

Hi Everyone, my first post - already glad to see how helpful people are here! Thanks so much for this and related posts about focal length. I lack enough experience at this point to figure out what len(s) are needed to take still shots at about 4 cm away +/- 1 cm. The subject will not be moving. Wha...

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