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1  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.
2  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
3  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.
4  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
5  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.
6  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?
7  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..
8  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
9  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?

10  Using Arduino / Project Guidance / Re: problem with turning on/off 12v 50w halogen on: December 09, 2012, 10:11:25 am
Hi retrolefty, I had the same issue again. I used the FQP30N06L transistor, it's the same stocked by Sparkfun as you mentioned, but I still couldn't turn on that 12V 50W halogen lamp. Can't figure out what's the issue here. Any clues or hint? Anybody? Thought this was gonna be easy.

Cheers.
11  Using Arduino / Project Guidance / Re: How to detect people/motion through glas on: December 05, 2012, 09:22:38 pm
what if you use Passive Infra Red sensor and attach it to the ceiling? No.

I've had this issue before for a client work, I ended up using Kinect because it's IR is strong enough to see through a 2cm thick glass. You may wanna try it too smiley
12  Using Arduino / Project Guidance / Re: problem with turning on/off 12v 50w halogen on: December 05, 2012, 09:17:38 pm

Quote
Sorry but I don't know a thing about the:
Quote
to a 12V 50W lighting system?
It would appear that there is nothing wrong with your lamp or seperate 12 volt power supply, but maybe your
'to a 12V 50W lighting system' can't handle the additional load of adding the lamp to it? Again I just don't have enough information about your system to help with your symptom.

Lefty

apologize lefty. by saying 12V 50W lighting system what I meant was that rail lighting thing on the picture. I tried to gather information about this thing, it's just none. but I'm sure there's something about it, because without installing the lamp to the rail lighting, I can turn on the light. I'll see if I can get more information about this thing
13  Using Arduino / Project Guidance / Re: problem with turning on/off 12v 50w halogen on: December 05, 2012, 09:13:38 pm
Hi,

How did the relay "fail"?? It seems like if the relay actuates it should not have trouble switching the lamp(s)..

See some Arduino Power Info on the ArduinoInfo.Info WIKI here: http://arduino-info.wikispaces.com/ArduinoPower

Sorry about the language, what I mean is the relay works, it clicks, but it's not enough to turn on the light. I think, maybe because I didn't feed enough external power to the lamp, but I've left that for a while now and am now focusing on using transistor. But thanks for the link, I think I need to do more reading while being away from the circuits.
14  Using Arduino / Project Guidance / Re: problem with turning on/off 12v 50w halogen on: December 05, 2012, 12:00:08 pm
hi lefty, thaks a lot again for the hint. I ordered a similar N-MOSFET type transistor, not here yet, so I'll update it later.

Now, I'm having a similar issue. I tried to power a track lighting similar to this


I use a 12VDC 5W lamp for it. Now, I can turn on the light by plugging it straight to a 12V power supply. However, when I plug the lamp to the track lighting, I couldn't turn it on, even when I power the lighting straight to the power supply. There's no specification written in the box, but there's a sticker on it saying 12V 50W.

Question is, is it okay to plug a 12V 5W lamp to a 12V 50W lighting system? Do I need to use the same transistor use to power 12 V 50W lamp as in your reply before?

Sorry if it seems stupid, never dealt with this sort of lighting situation before smiley
15  Using Arduino / Project Guidance / problem with turning on/off 12v 50w halogen on: December 04, 2012, 12:10:54 pm
Hi,

I'm having a problem with turning on a 12v 50w halogen lamp. I've tried using a relay which failed and also a IRF 520 MOSFET transistor which also failed. I'm not sure what's the problem. I tried it with a 12v 1.5w LED lamp and the thing worked. This is the schematic that I used as an example



I just changed the input voltage to 12v dc from a power supply. So, can anybody point me where I might have done wrong.

As an additional information, the transistor is able to feed 6.5 - 9.2 A, so in theory that should be more than enough to drive the halogen lamp right?

Thanks a lot guys smiley-grin
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