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1  Using Arduino / Motors, Mechanics, and Power / Re: How to control length of wire on: June 01, 2014, 06:14:06 am
Yes! not too much, probably less than a meter and very slow. I can imagine maybe <5 cm/second.

I googled around and found this:
http://learn.robotgeek.com/demo-code/123-arduino-linear-actuator-tutorial-preset-position-button-control.html

But linear actuator seems pretty overpowered. Perhaps I can use combination of motor and strings? Or pulley? I'm just looking how to make the proper motor/servo leg for my need.
2  Using Arduino / Motors, Mechanics, and Power / Re: How to control length of wire on: June 01, 2014, 06:04:15 am
The wood sticks are nothing like LEDs on a wire. Which are you really after?
I think I've been pretty bad here, terribly sorry for the mixed up. Maybe I should edit the thread title.
I just want to know how can I make servo move thing up and down. What I had in mind is similar to those sticks, only I want it to move up and down.
3  Using Arduino / Motors, Mechanics, and Power / Re: How to control length of wire on: June 01, 2014, 06:01:58 am
for the wood box, I would use a threaded rod and a motor. the box looks like it is 20x20, so there would be a lot of motors if every stick was controlled individually.

I would offer the drops on the Sculpture are run from steppers, not servos.
the semacode sculpture could be simple DC motors that reset to zero by retracting to the stalled position.  small CD motors could easily fit in the wood. the ones on my quadcopter are very tiny.

Hmm, this looks like an interesting solution. What do you mean by simple DC motors that goes to stalled position? Perhaps a motor with added objects so that it can move the wood back and forth? I'm just curious how can I make motor that does such thing?
4  Using Arduino / Motors, Mechanics, and Power / Re: How to control length of wire on: May 30, 2014, 07:54:16 pm
Sorry, not sure if my last post makes any sense. This picture illustrate more of what I really aim for



I can imagine the sticks move forward and backward and controlled by the servo. So, how's the mechanic regarding the servo and the legs then?
5  Using Arduino / Motors, Mechanics, and Power / Re: How to control length of wire on: May 30, 2014, 07:41:15 pm
Wow thanks for the ideas guys. I have to agree that this might be a stepper motor and a reel and it's easier to imagine since the objects are moving downward relative to the motor.

Now, what if the motor is in the bottom and the objects should move upward first? Should there be any supporting force or leg that does the trick?
6  Using Arduino / Motors, Mechanics, and Power / How to control length of wire on: May 30, 2014, 11:28:13 am
Well, this maybe non-electrical post, but either way, I'll just post it here.

I'm thinking of making an installation that's mechanically similar to what ART+COM did for the Singapore Changi Airport shown in this video:



I want to control movement of way lighter objects (was thinking about 1 LED inside plastic). So I figure that I can use small servo to accomplish it. But, a question spring to mind, how can I make the servo control the length of wire like in that video? Is there any mechanical diagram that I can follow? Especially regarding how I can build appropriate servo leg for such purpose..

Thanks everyone smiley-grin
7  Using Arduino / Project Guidance / Re: Will I need external power? How to calculate it? on: December 10, 2012, 03:43:15 am
generally speaking, you'll need external power to power stuffs that requires more than 5V, I can say motor or light bulbs and heaps other things.

What happen if you didn't feed enough power? Well, the targeted thing just won't run. Don't think it'll damage your Arduino though.
8  Using Arduino / Project Guidance / Re: DMX Hardware issues on: December 09, 2012, 10:15:38 pm
yes, it can send and receive DMX, the site also has some instructions on how to build his version of DMX shield, may come in handy smiley
9  Using Arduino / Project Guidance / Re: DMX Hardware issues on: December 09, 2012, 10:01:16 pm
is that SerialtoDMX sketch the one that you got from TinkerIt?  The website didn;t say anything about supporting UNO, but nevertheless UNO uses ATMEGA 328 so i think it should be OK.

I still think that the timing is the issue here, you may wanna use this DMXSerial library instead http://www.mathertel.de/Arduino/DMXSerial.aspx it worked for me using the 1.0 Arduino IDE too.
10  Using Arduino / Project Guidance / Re: DMX Hardware issues on: December 09, 2012, 09:45:39 pm
I'm thinking this maybe more of a timing issue. I guess. What Arduino do you use? I made an Open DMX board using Arduino, first I use the old Diecimila board with ATMEGA 168 and it has some troubles, blinking erraticly to be exact. Then I switch to Duemilanove with ATMEGA 328 and the problem disappeared. From what I read, the ATMEGA 328-based Arduino board seems like the best option for DMX, not sure about the newer Arduinos
11  Using Arduino / Project Guidance / Re: People Count on: December 09, 2012, 09:41:19 pm
I don't think PIR will allow you to do this, my suggestion is to use openTSPS, it's an open source software that does video recognition, so you just use a webcam and it will do all the processing including counting number of person in front of the webcam. OpenTSPS uses OSC to communicate with other software, so you can use Processing to get this OSC value and transmit it to Arduino via serial or use the Firmata firmware so you can just do all the programming inside Processing. Seems to me that this is the easiest method. You'll need a computer for the installation though.
12  Using Arduino / Project Guidance / Re: problem with turning on/off 12v 50w halogen on: December 09, 2012, 09:25:31 pm
One reason why the 5w halogen may not work in the track light is some tracks that are low voltage use somewhat of a hybrid transformer/switching supply and have a minimum draw and will not operate unless that minimum is fulfilled but that all depends on the supply

yeah, I suspect the same thing too. but then I went barebone and connect the 50w halogen straight to the circuit and Arduino, didn't work. I don't think I fed enough current to make it 50w. Pretty sure I have 12V though.

So, say, will it work if I use 16V or 24V power supply?
13  Using Arduino / Project Guidance / Re: problem with turning on/off 12v 50w halogen on: December 09, 2012, 12:18:05 pm
ah so should I not use a breadboard then?

that cylindrical thing is a power supply, wrong symbol I guess..
14  Using Arduino / Project Guidance / Re: problem with turning on/off 12v 50w halogen on: December 09, 2012, 12:01:21 pm
oh forgot to tell, I measured that there's 12V voltage supplied to the halogen lamp. this is the output of the circuit, not just the one supplied straight from the power supply
15  Using Arduino / Project Guidance / Re: problem with turning on/off 12v 50w halogen on: December 09, 2012, 11:58:29 am
okay, I use a 12v dc power supply, wired according to this picture:



So it has that shared ground connection. Well, the power supply can feed max 1A. I tried turning on a 12V 5W lamp and it worked. So, could it be that the transistor just didn't give enough current to turn on the lamp?

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