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1  Using Arduino / General Electronics / Re: Powering LEDs on: September 18, 2014, 04:01:59 am
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Normally how much current (mA) do I need for 1 LED to turn on ? If I give 1 A to 14 leds , will they burn ?

A typical 5mm LED takes anywhere from 10mA to 20mA dependent offcourse on the color too! and also how much current limiting you do with limiting resistor, ascertain this from your datasheet whether the led's are that High power! to take 1A even if 14 are lit!
2  Using Arduino / General Electronics / Connecting the GnD on SMD crystal? on: September 18, 2014, 03:52:50 am
here's the datasheet>>(http://www.abracon.com/Resonators/abm3b.pdf) to the crystals I'm using ,these are typical  5 x 3.2mm and 16Mhz , will it workout all fine without connecting the GND contacts, I have PCB not recognizing the ATmega32u4 so maybe that;s because GNDs pins on the crystal need to be connected too?
3  Using Arduino / Project Guidance / Re: Arduino Leonardo / YUN as HID keyboard for PC on: September 16, 2014, 05:38:47 am
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any way thanks I will have a look at the links above first...  I hope i will not get lost in the IDE..

Naah! The IDE has it's own benefits and limitations but is generally good for beginners, also you may goto VISUAL STUDIO plugin for arduino ide so you can have a very good dev. environment to develop some wiring code.
4  Using Arduino / Sensors / Re: PT100 Sensor, 0-10V how to connect it to Arduino Due? on: September 16, 2014, 03:35:58 am
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and what can i use, to connect the 0-3.3V ANALOG OUTPUT of the arduino to an actuator that accepts control voltages from 0-10V?

Providing a PWM output from an Arduino on a OP-AMP will do the trick.
5  Using Arduino / Project Guidance / Re: Help with controlling an RGB Led Strip WS2812 on: September 16, 2014, 03:31:06 am
20mtrs of strip means 4 full rolls  smiley-eek, voltage drop is going to happen and you will have discrepancies anywhere in the 3rd rolls end or middle, make sure to have power at every 2 strips.
and with voltage drop I also mean  the communication signals will drop too! that is a very damn problem I have faced , So I suggest to control at max 2 strips and the other 2 Strips from another control output(whether it TWI or ONE WIRE).
All this is surely implicable with ws2801s , ws2812s are a better breed but still all the above may help you if you encounter problems.
6  Using Arduino / Project Guidance / Re: PID Control Library Question on: September 16, 2014, 03:24:11 am
You did PID tuning? or what? and what about Kalman Filtering?
7  Using Arduino / Sensors / Re: How to connect more than one ADXL345 to Arduino on: September 16, 2014, 03:07:36 am
Maybe the OP can connect 2 on i2c and do not use any port expander and use SPI for another one if he needs 3 then he's fine and done.
8  Using Arduino / Project Guidance / Re: Suitable arduino for home automation system on: September 16, 2014, 03:03:40 am
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I'm not talking about the uC chip, I'm talking about the Arduino card. Maybe in his case a Uno won't have enough pins and it might be waste of MONEY if he later has to upgrade to a Mega, say. My real point is, engineering design is about understanding requirements before proposing a solution.

Why not talk about the uC dude! is something really wrong with you with all that breabBoard Arduinos out there you seriously think that "Arduino card" is something monopolistic , everybody knows what's the main thing that works on this board, so just talk about that what is actually going to workout there.
Also the OP has no requirement as such depicted in terms of sensors and I have personally done HomeAutomation so I know how the fitting of such systems goes in a Home environment and that doesn't happens most neatly in form of one big controller going at one place because practically it cannot control all that from a far away point feasibly so anyways he needs small controller modules spread in all the house to control.

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... means that you get paid by students to do their work for them, then there is very definitely something wrong with that. I will take that opinion to my grave.

Yes you can goto the grave with whatever in your head, I don't give a damn, I'm not here to correct you, I'm here to share my experience which I did.
Also, This is not a wrong on my part services get popped up where ever shortfalls are found ,time for you to understand some economic's.
9  Using Arduino / Sensors / Re: How to connect more than one ADXL345 to Arduino on: September 16, 2014, 02:52:43 am
USE a MUX(Multiplexer) the ATmega328p already has a mux built in because it has various Analog inputs but just one A/D converter..... use a MUX , The only drawback is the time taken to read all the mux'ed analog inputs but it should be fine!

Sorry I thought its an Analog input one for i2c you need i2c port expander http://playground.arduino.cc/Code/I2CPortExpander8574
10  Using Arduino / Project Guidance / Re: Suitable arduino for home automation system on: September 16, 2014, 02:48:54 am
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You must have inside information as to the number and type of sensors and actuators and therefore the number of pins required.

Did he gave us such information NO  smiley-money ,I'm talking based on my experience, In 90% cases as per my experience ATmega328p will suffice .

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Does that mean what I think it means?

Why you making a big deal out of it byQUOTING it! nothing wrong in it.
11  Using Arduino / Project Guidance / Re: Arduino GSM problem. Need help with the input signal on: September 16, 2014, 02:44:17 am
All of that detail has puzzled me up maybe just tell me what you want to achieve.
12  Using Arduino / Project Guidance / Re: Suitable arduino for home automation system on: September 16, 2014, 02:32:24 am
Well go with an UNO , rest depends on whether you want to concentrate the "BRAIN" of your home automation system at one place or spread it all the place wired or wireless.
I have done such projects a TONN times and helped students for a payout so I would suggest that going for a spreaded version is more of a practical and feasible way to do this.
13  Using Arduino / Project Guidance / Re: Enter text and passwords for me on: September 16, 2014, 02:26:33 am
I already did a similar thing but rather much fun! can't go in deep about it though.
Still... LEO will workout for ya!!
14  Using Arduino / Project Guidance / Re: Arduino Leonardo / YUN as HID keyboard for PC on: September 16, 2014, 02:24:11 am
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Firstly I am familiar with Atmega and various embedded processors. But I don't  know everything.  smiley-confuse

sadly I am new to aurdino itself.

I think it's generally the other way out, generally people know Arduino and then from Arduino they come to know such a thing like an ATmega exists  smiley-wink

Nevermind.

you need a USB micro with HID stack supported on it which in Arduino realm is the Leo.
15  Using Arduino / Project Guidance / Re: beginner need some advice on: September 16, 2014, 02:21:29 am
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hey guys, i want to make a smoke detector using mq2 and dht11 and send the alarm by sms. the condition is when a temperature reach 40C and there's a smoke detected then the arduino will sends a message. is it possible to make that project?
and do u guys have a references that i can use? thank you

Arduino is not going to send message by itself you will need to first of all get the MQ2 sensor prepared which requires various steps such as pre-heating etc and then you will have to test it to code what Analog values are putup.

To send messages from arduino you will need a grps or 3G module like the SMB5100 or SIM900 or SIM300 or ETC.
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