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31  Using Arduino / Project Guidance / Re: How to control a Ceiling Fan? on: January 10, 2012, 04:15:15 pm
(PeterH) Yes, I am planning on controlling the fan speed. The second part of this project will include a iOS app so everything would probably be controllable via a mobile device.. but for now I would just be happy to control it by remote, yes probably with a knob.

(brucethehoon) thanks a lot for the link. that looks really good but I wouldn't know where to start "converting" that to arduino. have you tried something similar yourself?

Also, a friend suggests I could use a Dimmer Rack with a DMX controller.. that's the cheapest I found but yes it's still pretty expensive: http://www.soundlightuk.com/shop/products/Soundlab-4-Channel-DMX-Dimmer-Pack.-1000W-per-channel.-Can-be-controlled-via-Standard-512-DMX-or-by-0%252d10V-Analogue-Control.html but it could be pretty easy to interconnect the DMX with midi, so with a computer.

What you guys think about this? I need to decide asap!  Thanks to everyone again
32  Using Arduino / Project Guidance / How to control a Ceiling Fan? (edit!) on: January 10, 2012, 10:15:22 am
Hi guys,

is there anyone out there who could give me some hints on how to control a ceiling fan with my arduino? For controlling I mean turning  it on and off (which could be done just with a simple relay, right?) but also controlling its speed. I am not sure how to handle this, as I've never worked with 220 volts "devices" before..

I just changed the title of the post cause it could have been misleading as I am asking how to do this, not telling it! Please let me know if you have any idea about this. It could may be even not using arduino, I don-t know! Thanks a lot
33  Using Arduino / General Electronics / Re: VU Leds on speakers, no arduino involved? on: January 05, 2012, 09:01:34 am
I am not really worried about the signal quality. as I will have more then 30 speakers it is not needed to be precise, it's not an audiophile application if you know what I mean.
I also found another one here: http://www.quasarelectronics.com/velleman/k4307-audio-power-meter-kit.htm but it's really expensive. I was wondering if anyone would have made something similar himself?

Thanks

34  Using Arduino / General Electronics / Re: VU Leds on speakers, no arduino involved? on: January 05, 2012, 05:06:15 am
Hi Erni, thanks a lot for your reply! the LM3915 IC looks really good but I am not sure it's what I really need. I did a quick search but it looks like it requires external power... at least 3volts (that is not so bad cause i could use a battery pack). I really want to understand how that kit (http://store.qkits.com/moreinfo.cfm/FK102) can work just by using the power running on speaker cable..

Any clues?
35  Using Arduino / General Electronics / VU Leds on speakers, no arduino involved? on: January 04, 2012, 10:25:03 am
Hi everyone,

I am trying to figure out how to connect VU meter leds on speakers to give visibility to the audio signal that they will play.

This is as part of an installation and, because of its location and design, it could be a little complicated. The set up is out side, so everything needs to be waterproof, while the amps (that will power all the speakers) will be in another place covered.. so there will be long wires going all the way to the speakers, and I would like to avoid adding other cables running from the amp to the speakers, so I was hoping to use just the power running on the speakers cable. We found this kits: http://store.qkits.com/moreinfo.cfm/FA102, but they are pretty expensive and would be good to find something in europe..

Any solutions or ideas would be much appreciated! Thanks a lot..
36  Using Arduino / Project Guidance / Sensor for Bath Tap Mixer: Ideas welcome! on: June 27, 2011, 01:41:18 pm
Hello,

I am trying to figure out the best way to put a sensor on a bathtub tap mixer so to use the tap a knob to control analog values.
The tap will not be used for water anymore, so don't worry about waterproof problems.. I am sure there is an easy way to do this, but my trials and mistakes didn't really help. Any ideas?

Thanks
37  Using Arduino / Project Guidance / Hall Effect sensor: proximity-motion? on: June 27, 2011, 01:16:00 pm
Hi everyone,

I just ordered some Hall Effect sensors (ALLEGRO MICROSYSTEMS A1302KUA-T) but I am not sure whether they can just act as on-off switch or also as priximity sensors. I need to measure the distance of a moving piece of metal (where i would screw a magnet) while it is moving.


ps: if you want to know what's this is all about. I am just trying to figure out a way to attach a sensor to a bathtub mixer.. after trying (and failing) the potentiometer way i thought it could work measuring the moving distance of the screw which is inside the tap, the one that change the water pressure inside..

thanks a lot!
38  Using Arduino / General Electronics / Re: Arduino Mega PWM LEDS: Resistors? on: June 13, 2011, 05:20:31 am
I got lots, but I will use the correct number for each arduino if you could tell me exactly which resistors and how many of them..

My guess is 10 leds (200mA) with 90 ohm resistors if powered by 5volts

or 300 ohm resistors if powered by 9 volts adapter, right?
39  Using Arduino / General Electronics / Arduino Mega PWM LEDS: Resistors? on: June 12, 2011, 08:26:58 pm
Hello,

for a quick project I need to use these leds (http://www.sparkfun.com/products/9850) hooked up with the 12 PWM mega pins.

the leds are 20mA 3.2 Volt

the sketch will fade all the leds at the same time using various durations for each of them

What kind of resistors I need to use? Please I need to buy them tomorrow, let me know if you have any idea..

I tried without resistors and they all work fine, but the Mega chip is burning hot so I guess I need to do something different. I have no time to use IC chips at the moment..

thanks
40  Using Arduino / Project Guidance / Re: 40 bright fading multiple LEDs array on: June 12, 2011, 07:19:04 pm
200/330 R? What's R stands for? I always used ohm.. ? sorryyyy
if you can tell me i'll go buy them tomorrow morning. thanks a lot

41  Using Arduino / Project Guidance / Re: 40 bright fading multiple LEDs array on: June 12, 2011, 07:13:49 am
Thanks Mike

So i'll go for 2k resistors between the arduino pin and the + of the led, right?

Also as Simpson was saying "a wise amount" for chip would be 10? What would happen with 12? (2-14 PWM)

42  Using Arduino / Project Guidance / Re: 40 bright fading multiple LEDs array on: June 11, 2011, 08:18:44 pm
I have no idea what happened, but all this thing began to be too complicate for me. Chips blowed up, wires are playing up, breadboard always do different things.. I am gave up for the moment and just use the pwm avaibables on 2 arduino mega i borrowed for this week. so i should be able to use 24 leds right? It's fine for now, then I'll get some time do resolder better everything.

So, quoting something from the first page of this topic:
Quote
You could... also drive them normally, but you'll have to be very sure your programm doesn't turn on too many leds at the same time. With 800mA flowing, the possibility of smelling magic smoke is quite high. 1 mistake while writing/testing the program can be enough to need a new Mega. Internally the mega uses different ports up to 8 pins per port, you'll also need to check the datasheet to see what a port can handle max.

I am gonna try this easy way. Do I need resistors between the leds (20mA, 3.2 V drop) and the arduino pin, or not?

thanks
43  Using Arduino / Project Guidance / Re: 40 bright fading multiple LEDs array on: June 11, 2011, 12:02:29 pm
where should i put the capacitors? is 47 better then 100 then? i've got both
i tried:

arduino 5v > capitor > circuit
arduino gnd > capitor (short leg) > circuit

but doesn't seem to change much
44  Using Arduino / Project Guidance / Re: 40 bright fading multiple LEDs array on: June 10, 2011, 03:12:47 pm
Nice article. I'll try understand it all.. I wish you were our lecturer or similar!!  smiley-mr-green

Have you used any of these solutions for the tlc chip in particular?
45  Using Arduino / Project Guidance / Re: 40 bright fading multiple LEDs array on: June 10, 2011, 11:38:01 am
I tried with the 9 volts adapter but it's the same. It is a 9v, 0.6 A one so it might be a current problem for real... I'll go and check if i have a 1A adapter, but i doubt it, will have to buy one.
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