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16  Using Arduino / Networking, Protocols, and Devices / Re: 1-Wire Vcc GND - connect to Data GND on sensors? on: April 01, 2014, 12:54:39 pm
There are allot of places...
For example: http://1wire.org/index.html?target=p_2.html&lang=en-us
and: http://www.fischer-net.de/hausautomation/haustechnik/1-wire/26-1-wire-belegung-kabel-stecker.html

I don't like parasite mode - extra 5Vcc is more stable and the CAT cable has enough wires smiley

Sure, the idea is to also shield the 5Vcc - but nowhere i found what to do with the second GND.
It only makes sense to me like i draw it. If you only connect one side you have a big antenna.

I was looking for a circuit off a ready made sensor from some company's to see what they to.
But sure, they don't show it that you don't steel there circuit.
Also all the PCB pictures are so blurry and small that you see nothing.

I already made the temp sensor from my circuit on a 0,32x0,98" veroboard (damn that 0805 SMD ferrite bead is small).
Now i need to solder the sensor to the CAT cable (for the in-floor heating) that i can lay my laminate floor and then i have
no longer access to it.
Unsure what to do with the GND.
17  Using Arduino / Networking, Protocols, and Devices / 1-Wire Vcc GND - connect to Data GND on sensors? on: April 01, 2014, 09:32:51 am
Hi,

I'm a little confused.
The suggestion is to use one pair of the CAT cable for Data and Data GND
and another pair for Vcc (5V) and GND.

Does that mean on my sensors i connect them together?
If not i think the extra GND for Vcc would be useless.
But on this premade DS18B20 they just pass the GND through: http://www.fuchs-shop.com/download/manuals_for_t-sense_05-22-08.pdf

In the attachment are my own sensor circuits - there you can see better what i mean.
18  Community / Exhibition / Gallery / Re: Library for time zone conversions and automatic DST adjustments on: October 31, 2013, 12:48:24 pm
NTP sends UTC only, without adjustments for daylight time or time zone.
Thats the reason i was asking. So i can do it like my router with your library.
There i can set the Time Zone and NTP Time Server and have a Auto Daylight Savings Time checkbox.

Now i see "the Time library will function as a software RTC without additional hardware" in the readme.
So the first sentence "A primary aim of this library is to allow a Real Time Clock (RTC)" did confuse me.
19  Community / Exhibition / Gallery / Re: Library for time zone conversions and automatic DST adjustments on: October 31, 2013, 08:51:45 am
Hi,

this library works only with RTC's?
Is there something like "Auto Daylight Savings Time" for ntp?
20  Using Arduino / Project Guidance / Re: Need advice: NodeJS + Arduino wirelessly on: October 30, 2013, 11:58:38 am
Why are you hung up on using NodeJS, whatever it is?
Its beside Websockets the biggest thing since years: https://www.udemy.com/blog/learn-node-js/
Johnny-Five at  NodeConf 2012:

@neilff, i don't know what exactly you want to do. Johnny-Five is great but i think for stuff like Home Automation i don't
like the idea of having the logic on the Server.
I'm also locking for the best way for my interface and i thing MQTT is the way to go.
With Johnny-Five there is to much data if you want to use Ethernet.
I also thing MQTT is more secure: http://readwrite.com/2011/11/22/ibms-andy-piper-part-2-how-mqt

At the moment I'm testing HiveMQ with Paho MQTT JavaScript Client (Eclipse/IBM).
HiveMQ has build in Websocket and there is no need for other stuff like node.js, socket.io, Mosquitto...
Sure you need a machine running with a MQTT Broker (HiveMQ) and for me the decision to make now
is if i use Paho MQTT JavaScript (client-side) or node.js (server-side).
21  Using Arduino / Project Guidance / Re: what do you call the thing that connects to the spinning part of the motor? on: February 18, 2013, 01:11:33 am
The thing that sticks out and you can attach things to it smiley-yell
22  Using Arduino / Project Guidance / Re: what do you call the thing that connects to the spinning part of the motor? on: February 17, 2013, 08:52:14 pm
Shaft coupling
Something like this put smaller: http://www.reichelt.de/Potiknoepfe/ACHSKUPPLUNG-2/3/index.html?;ARTICLE=42133
23  Using Arduino / Project Guidance / Re: Clean and energy efficient LED dimming on: February 17, 2013, 08:47:26 pm
@lax123, i thank you that you want to help me. But that is basic stuff i know.

And this calculator shows what i don't understand. Why so big and short cables for LED's?
I read stuff like 0.75mm2 - 1.5mm2 on most sides.
But if you look at eldoLED POWERdrive they write 3 meters to the LEDs.
And they write 0.2mm2 per 1 ampere.
They also wrote somewhere that 6 meters is no problem with CAT cable and also wrote that
they have customers who made up to 50 meters.

What i can't find is a answerer to PWM over longer distance.
If i have a LED driver with PWM in - how long can i make the PWM line from the Arfuino
to the driver.

There is also the option to dim analog. This would change the color temperature a little.
But i can't see in the Cree datasheets what color temperature at which ampere.
They write color temperatures from 2600 to 4300 for the XP-E High-Efficiency White LEDs.

Damn is this LED stuff complicated when it comes to dimming.
I wish i had a oscilloscope smiley-grin
24  Using Arduino / Project Guidance / Re: Clean and energy efficient LED dimming on: February 16, 2013, 03:50:23 pm
0.5 Meter?
It's a house. There are 5-10 meters...
I found this driver: http://www.leds.de/out/media/KSQ.pdf
And they write to make the cable from the supply not longer then 1,5 meters.
Or is it that they assume that power cables are always unshielded?
25  Using Arduino / Project Guidance / Re: Clean and energy efficient LED dimming on: February 16, 2013, 02:26:05 am
Ok, i did some measuring as you can see in the attachment.
I cant figure out the driver circuit cause its to small.
But there is a R25 and 3R00 on the PCB.
If i look at the M7201 data sheet that would mean they drive the LEDs with 0.1 / 0,25Ω = 400mA
That is close to my measurement.
If the 0.25Ω and 3Ω resistors are parallel its right: 0.1 / 0.23Ω = 430mA

If i look at the CRI and Color temperature and everything i bet they are Cree XLamp  XP-E High-Efficiency White LEDs. http://www.rapidonline.com/pdf/55-2568.pdf
But if the forward voltage is 3V, why do i measure 9V?
Shouldn't it be: 12V - 3 x 3V = 3V

So from all the reading around it looks like the driver needs to be near the LEDs.
So i need a third wire for PWM?
But how about the PWM cable length?
26  Using Arduino / Project Guidance / Re: Clean and energy efficient LED dimming on: February 15, 2013, 08:15:38 am
After thinking i cant open the LED without breaking it i have it open now.
The 3 LEDs are series-connected.
The electronic was sealed in some silicon.
Looks close to this ones: http://detail.china.alibaba.com/pic/914205741.html

Its a MT7201 1A LED driver: http://www.maxictech.com/en/UploadFiles/MT7201_rev1.1_EN.pdf
And the circuit is close to this one: http://www.led-treiber.de/html/getaktete_treiber.html#MIC3201
But there are some diodes in front of it as rectifier.

Looks like you can PWM control this driver.
I will try to reverse engineer the circuit/PCB to find out what the LEDs need.

If i build my own driver, is it better to
1. put the MOSFET and driver near the LED
2. put the MOSFET near the Arduino and the driver near the LED
3. put the MOSFET and the driver near to the Arduino

And sure there are dimable LEDs out there, but they are not cheap and this have a really
good Colour Rendering Index and Color temperature.
27  Using Arduino / Project Guidance / Re: Clean and energy efficient LED dimming on: February 15, 2013, 05:31:50 am
As a german i know what it means smiley-grin

But i think its there cause there are to many factors with transformers and dimmers.
I have a 12 volt halogen electronic transformer that is dim able with "reverse phase control dimmer" and
"phase control dimmer". But here the dimmer is in front of the transformer and its AC.
I was thinking DC and PWM the whole time - maybe there is another way.
I mean if i feed less volt to the LED its darker.
Maybe AC instead of DC...

Edit:
Just found this:

So i need to do more research and use other words in google.
Was looking the whole time for PWM stuff.
28  Using Arduino / Project Guidance / Re: Clean and energy efficient LED dimming on: February 15, 2013, 03:27:14 am
God damn. After removing the LED i still had 12Volt.
From 10 Mosfets i picket a broken one smiley-mad

So i did some testing now and the electronic in the LED makes problems.
Here are some measurement:
Monitor PWM: 1, Pin 6 Volts: 0.03
D6 = 0.02 Volt
LED = 0.00 Volt (lights up)
LED turned = 0.21 Volt (lights up)
no LED = 11.3 Volt

Monitor PWM: 36, Pin 6 Volts: 0.72
D6 = 0.71 Volt
LED = 2.85 Volt (lights up)
LED turned = 2.85 Volt (lights up)
no LED = 11.5 Volt

If i connect the LED directly to the 12 Volt power supply i have 12 Volt at the LED.
In the PWM circuit i have the funniest volts.

There are allot PWM circuits out there but PWM is what the Arduino does.
Maybe a LED driver?
I found this: http://www.led-treiber.de/html/leds_grundlagen.html#PWM-Dimmer
and they write it works with all there LED drivers: http://www.led-treiber.de/html/getaktete_treiber.html

How about a power supply for all the LEDs and a "reverse phase control dimmer" in front of them
who is controllable with the Arduino?

There must be a way to dim those LEDs with some kind of circuit :-(
29  Using Arduino / Project Guidance / Re: Clean and energy efficient LED dimming on: February 14, 2013, 09:57:41 pm
Grounding the gate changes nothing.
There is no limiting resistor cause its a 12V LED. Its one of those you can swap with
the 12V halogen lamps in halogen systems: http://www.amazon.de/ersetzt-35Watt-Halogen-warmes-Kelvin/dp/B0076J5AHG/
They are really bright like 35Watt normal lamps and make a nice light.
The first LED i saw that really make sense when it comes to price<->power saving (amortization).

There is no CAT6 at the moment. Everything is short and on the breadboard smiley-grin

But when you talk about shielding. Would you always connect the shield to ground?
Both ends ore just one?
I use just shielded cable:
Stranded CAT.5E SF/UTP for switches and flow sensors.
Stranded CAT.6 S/STP for network.
Solid CAT.6 S/FTP AWG23 for 12V power to the LEDs and Arduinos.
Lappkabel UNITRONIC LiYCY 2x0,25mm2 where i have to spread the 12V: http://products.lappgroup.com/online-catalogue/data-communication-systems/low-frequency-data-transmission-cables/din-colour-code/unitronic-liycy.html

And i want to make a extra cable from the breaker box to my home stereo.
I want to use Lappkabel ÖLFLEX 120 CH 3x2,5mm2: http://products.lappgroup.com/online-catalogue/power-and-control-cables/various-applications/halogen-free/oelflex-120-ch.html
But i'm not sure what to to with the shield on this 220Volt cable.
30  Using Arduino / Project Guidance / Re: Clean and energy efficient LED dimming on: February 14, 2013, 04:55:59 pm
The Highly Efficient thing was just a idea in the beginning when i was reading around and looking for infos.
Now i just want to get the dimming working.

Hm, a resistor at the gate? I have the 4.5Volt at the LED even with the gate not connected to the Arduino.

Source voltage? You mean the 12Volt that go to the LED? The IRLU8726PBF is made for up to 30Volt.

I can find allot 220Volt MOSFET circuits but nothing on logic level MOSFET.
From my understanding there is no need for a driver if you use a logic level MOSFET and
you can connect it directly to the micro controller.

I have just an 15 year old 2MP digital camera. No need for a new one until i have the luck to visit Disney World smiley-grin
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