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16  Using Arduino / Project Guidance / Re: LED strip power consumption on: June 29, 2012, 04:58:48 am
 I won't run anything at 100% and never all LEDs at the same time.

would this do it?
5V 20A 100W, MeanWell SP-100-5
http://www.hed-radio.com/de/Netzteil-SP-100-5.html

Again, I have 33 x 60cm strips in series. So how often do I need to power them, every 5m? that would mean 4 or powerpoints.

fubbi
17  Using Arduino / Project Guidance / Re: LED strip power consumption on: June 28, 2012, 11:20:24 am
Yes, split them up as there is no way you can get 40A through the first strip.

So how much can the strip take? I need to find a small outdoor power supply, or can I use a big one and somehow portion out the power?
Is there a way to divide a 20A output to 10x2A outputs?

thanks

fubbi
18  Using Arduino / Project Guidance / Re: LED strip power consumption on: June 28, 2012, 11:04:56 am
So I need several smaller power sources along the way?

fubbi
19  Using Arduino / Project Guidance / LED strip power consumption on: June 28, 2012, 10:28:33 am
I am about to work with 33 x 60 cm strips of this kind:
http://www.ladyada.net/products/digitalrgbledstrip/index.html

the strips will be connected in series and I am wondering how much power I will need

it states:

"Maximum 5V @ 120mA draw per 2.5" strip segment (all LEDs on full brightness) - about 2A per meter"

does that mean I need 2A x 20 Meter = 40A???

sounds like a lot...

Fubbi

20  Using Arduino / General Electronics / v23092 relay on every pin on: June 14, 2012, 09:13:29 am
Hi, I am currently overhauling an older project.

I have 64 v23092 relays http://pdf.dzsc.com/20090603/200903151022535524.pdf
each has a diode and a resistor on my board, but no transistor.


Now, what I want to do is tap in at the resistor with my new fancy mega screwshields to have each relay on a separate pin (2xMega with each 32 relays)


I am not good at reading data sheets and I wonder:

a. what happens if I have 32 of theses relays written to HIGH at the same time, will the Mega choke/burn/evaporate/create a black hole?
b. can I do this without a transistor, I really want to avoid having another board with 2x32 transistors. (I am well aware I SHOULD have one per channel).

thanks

fubbi


21  Using Arduino / General Electronics / Re: Battery life... on: May 29, 2012, 06:56:24 am
Quote
Here we go again. Lack of detail. Please post a link to the datasheet for the cow in question.

You can get it in dried form for convenience.  Just add milk.

http://www.msd-animal-health.co.uk/products_public/cepravin_dry_cow/product_data_sheet.aspx

yey! thread out of control the day before my installation at the gallery. thats not stressful at all... anyway I ended up going for a Led battery with 12aH, that should last for the day :-)

http://www.kjell.com/sortiment/el/batterier/laddningsbara-batterier/blyackumulatorer/blyackumulator-6v-12-0ah-p32824

thanks peeps

fubbi
22  Using Arduino / General Electronics / Re: Battery life... on: May 29, 2012, 04:02:23 am
With 9V, you can connect LEDs in series.

4 LEDs in series will drop approximately 6-8 Volts (depending on exactly which LEDs you're using).
Add a resistor to limit it to 20ma. (If your LEDs use 6.8 V, the remainder is 2.2V that the resistor has to drop. 2.2V/0.02A = 110 ohms.)
Make 5 strings like this for a total of 20 LEDs.

Total current draw is 5 *20ma = 100ma.
 

sounds good, I have already built the circuit with 4 transistors so I need 5 led on each... Also I have soldered 220Ω resistors to all my leds already...

I am off to the electronics store now, any last second advice? lead battery?

thanks
23  Using Arduino / General Electronics / Re: Battery life... on: May 29, 2012, 02:33:38 am
I am "in the field" and the little pocketmeter i brought can't measure A smiley-sad

I would -love- to see a picture of this meter;


here it is:


How about this:
http://www.clasohlson.com/se/Blyackumulator/Pr363019000

Or better yet (less bulky) this, can I have a few of these in parallel?:
http://www.clasohlson.com/se/Laddningsbara-batterier-Sanyo/Pr363020000

thanks
24  Using Arduino / General Electronics / Re: Battery life... on: May 28, 2012, 10:55:51 am

I thought 20 LED would be easy to run for a day... What would you use? I really want to avoid using a power cable for aesthetic reasons

I am "in the field" and the little pocketmeter i brought can't measure A smiley-sad

thank you
25  Using Arduino / General Electronics / Battery life... on: May 28, 2012, 10:00:09 am

Hi

I have 4 transistors pwm'ing 5 LEDs each, so all in all 20 LED. I want to run it off a rechargeable 9V block and I am trying understand how long the battery will last.

Can I assume that 20 led at ≈ 20mA (mixed 2 types and have no specs) with 220Ω R is 400mA and how does that relate to the
200maH that the 9V block has? I am considering using several batteries in parallel but how many would get my through the day. Its an art installation and I could have the batteries swapped every morning.

The arduino needs some juice too, its a pro micro and I don't know its requirements. http://www.sparkfun.com/products/10998

Most thankful!

Fubbi
26  International / Deutsch / Re: Arduino 0-10V PWM - KSQ on: April 25, 2012, 02:27:31 pm
hallo

wie hast du es am ende gelöst, hast du ein diagram?

danke!

fubbi
27  International / Deutsch / Neon Ballast mit 0-10v dimmen on: April 24, 2012, 08:29:30 am
Hallo

Ich versuche ein Neon Ballast mit 0-10v zu dimmen, egal wie ich es zusammenstecke macht mein TIP122 Transistor circa 0-1.2v statt 0-10v. Das RC Glied ist schonmal super. 1kΩ+10uf hat bei mir ein krasses flackern gelöst. Aber ich dimme nur ca 10% momentan.

Code ist das fade Beispiel und musste ok sein. Rechnet 0-255 hoch und runter.

Versteht jemand was ich falsch mache?

danke

fubbi
28  Using Arduino / Project Guidance / Re: Ipad Based wireless DMX stagelighting Control on: April 12, 2012, 09:13:00 am
2) http://makesomecode.com/2009/12/30/arduino-osc-iphone-and-dmx/
    this is exactly how i wanted it to be, just that instead of using the ethernet shield, i want to use wifly to communicate with my ipad.

Just my 2ç:
I think that setup looks superior, If you use a router and and a ethernet arduino you could add more dmx universes by simply adding more arduinos to the router. And you get the reliability of common wifi. I have done a lot of wifi stuff on stage and you should consider taking that route. It is the most sensitive link in your chain.

fubbi

29  Using Arduino / Project Guidance / Re: dimming neon (not fluorescent) on: April 12, 2012, 09:07:02 am
Digital pots tend to be very fast, fast enough that your eyes wouldn't be able to respond as quickly as they can switch.  It's unclear what the input requirements are for your selected dimmer; I could find the information easily from the site you listed.  My guess is that the input to the dimmer is high impedance (as in a MOSFET gate), and that the NPN controller you showed a scematic for would be just fine if all you want to do is switch on and off.  You could also use a MOSFET for the transistor and virtually elimate the load from the Arduino (presumably the source of your 0-5V pulse).

Hi thanks for your reply, but it turns out I have to generate PWM not resistance, please read the update above.

thank you

fubbi
30  Using Arduino / Project Guidance / Re: dimming neon (not fluorescent) on: April 12, 2012, 08:50:14 am
Thanks for your reply

Update: The input of the ballast is not for a variable resistor but for PWM 1-10v

can I use a simple circuit like this:


(found in this thread: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1288268120)

and will the 0-10v cause problems when the ballast expects 1-10v?

thank you

fubbi
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