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1  Using Arduino / Project Guidance / Re: Detecting Lead in places it shouldn't be. on: January 04, 2014, 04:00:05 am
It is not easy to detect a specific metal. The best way is with a flourecessent spectrometer but it is not a simple Aarduino project. The sure fire way is with a mass spectrometer again not a portable instrument.

Why do you want to do this?

What if you want to find if there is any abnormal metal which could be similar to lead. Especially "Lead". I think the conductivity of blood will increase if Lead levels are present. I atleast want to be able to detect highly abnormal levels of Lead or any other metal.

Also what about photo reflecticve like those they use in heart-beat sensors.
2  Using Arduino / Project Guidance / Detecting Lead in places it shouldn't be. on: January 04, 2014, 03:46:22 am
I want to know what methods I can use to detect Lead poisoning or Lead in just about any place it shouldn't be.

Like in body or blood,
Lead in drinking water,
Lead in food,
Lead in paint.

I guess I can't use Magnetometers because lead doesn't seem to be magnetic.

Can I use
1) Capacitance,
2) Resistance,
3) Photo reflective properties of skin or blood.
4)  Or just about anything else.
3  General Category / General Discussion / Re: Iteaduino plus Indiegogo campaign and a few questions to be answered! on: August 29, 2013, 04:28:16 am
They posted a demo video and it's really cool. Same programming syntax as arduino. Wow. It's kind of like Wiring Pi, I guess.

http://blog.iteadstudio.com/itead-os-gpio-and-uart-operation-demo/
4  General Category / General Discussion / Re: What is your experience with Arduino from China? on: August 26, 2013, 01:15:08 am
Iteadstudio.com has some good non-counterfiet boards.
5  General Category / General Discussion / Iteaduino plus Indiegogo campaign and a few questions to be answered! on: August 26, 2013, 01:10:40 am
I found this cool Indiegogo campaign by Iteadstudio. Its a linux development board with a lot more features than Raspberry Pi. However another feature which arduino users will find very useful is that it has an easy programming environment with pre written libraries, for example making a call would be as easy as Call("18002456633"). Here is the link http://igg.me/at/iteaduinoplus/x/4442622

However I have a few doubts myself about the board (or linux and elecronics in general, but related to the board). Please answer them.

1) Does software have to be seperately written for the board. Or will all linux software run on the board ? (If it has to be written seperately it's useless!)
2) Will software that works in Raspberry Pi work for this board?
3) They said that the final product will be in black. They look ugly but Iteadstudio makes many products in black PCbs.  Do black PCBs cost less?

6  Using Arduino / Project Guidance / Re: IR remote example not compiling after modification of library. on: August 19, 2013, 04:45:51 am
AWOL, I'm unable to understand what you're saying by "no indentation"

Here are the added Samsung and unmodified NEC ones. They are exactly the same but I'm not getting an error for NEC.

Code:
void IRsend::sendSamsung(unsigned long data, int nbits)
{
  enableIROut(38);
  mark(SAMSUNG_HDR_MARK);
  space(SAMSUNG_HDR_SPACE);
  for (int i = 0; i < nbits; i++) {
    if (data & TOPBIT) {
      mark(SAMSUNG_BIT_MARK);
      space(SAMSUNG_ONE_SPACE);
    }
    else {
    mark(SAMSUNG_BIT_MARK);
    space(SAMSUNG_ZERO_SPACE);
    }
   data <<= 1;
  }
  mark(SAMSUNG_BIT_MARK);
  space(0);
}

void IRsend::sendNEC(unsigned long data, int nbits)
{
  enableIROut(38);
  mark(NEC_HDR_MARK);
  space(NEC_HDR_SPACE);
  for (int i = 0; i < nbits; i++) {
    if (data & TOPBIT) {
      mark(NEC_BIT_MARK);
      space(NEC_ONE_SPACE);
    }
    else {
      mark(NEC_BIT_MARK);
      space(NEC_ZERO_SPACE);
    }
    data <<= 1;
  }
  mark(NEC_BIT_MARK);
  space(0);
}
7  Using Arduino / Project Guidance / Re: IR remote example not compiling after modification of library. on: August 19, 2013, 04:21:33 am
Sorry for the mis understanding guys. I modified my post with the right words. I suck at programming. So, bear with me.
8  Using Arduino / Project Guidance / IR remote example not compiling after modification of library. on: August 19, 2013, 02:57:41 am
I modified the Ken Sherrif's IR remote to work with Samsung TVs and I'm getting the following error while compiling the IR recieve dump example.

Code:
E:\Software\Software development\Arduino\Arduino\arduino-1.0.5\libraries\IRremote\IRremote.cpp: In member function 'void IRsend::sendSamsung(long unsigned int, int)':
E:\Software\Software development\Arduino\Arduino\arduino-1.0.5\libraries\IRremote\IRremote.cpp:73: error: 'SAMSUNG_HDR_MARK' was not declared in this scope
E:\Software\Software development\Arduino\Arduino\arduino-1.0.5\libraries\IRremote\IRremote.cpp:74: error: 'SAMSUNG_HDR_SPACE' was not declared in this scope
E:\Software\Software development\Arduino\Arduino\arduino-1.0.5\libraries\IRremote\IRremote.cpp:77: error: 'SAMSUNG_BIT_MARK' was not declared in this scope
E:\Software\Software development\Arduino\Arduino\arduino-1.0.5\libraries\IRremote\IRremote.cpp:78: error: 'SAMSUNG_ONE_SPACE' was not declared in this scope
E:\Software\Software development\Arduino\Arduino\arduino-1.0.5\libraries\IRremote\IRremote.cpp:81: error: 'SAMSUNG_BIT_MARK' was not declared in this scope
E:\Software\Software development\Arduino\Arduino\arduino-1.0.5\libraries\IRremote\IRremote.cpp:82: error: 'SAMSUNG_ZERO_SPACE' was not declared in this scope
E:\Software\Software development\Arduino\Arduino\arduino-1.0.5\libraries\IRremote\IRremote.cpp:86: error: 'SAMSUNG_BIT_MARK' was not declared in this scope

I've attached the modified Irremote.cpp file
Thanks.
9  Using Arduino / Project Guidance / Is this GSM shield any good? on: August 17, 2013, 04:31:25 am
I was thinking of getting a GSM shield for making a home security system with arduino. GSM modules (not shields) seem to be avaialbe for around 26$ in India (http://www.ebay.in/itm/SIM900-GSM-Modem-with-Antenna-and-RS232-interface-for-GSM-SMS-GPRS-MCU-projects-/281061937766?pt=LH_DefaultDomain_203&hash=item417098d266). But they are too big.

I finally found a shield in India for 50$.
http://entesla.com/microcontroller-development-boards/arduino/gsm-gprs-shield

The schematic is available here http://entesla.com/index.php?route=product/download/download&download_id=85

I want to know what features it is missing. I noticed that it was missing a backup battery option for RTC which is a really big con.

Thanks!
10  Using Arduino / Project Guidance / Re: About to buy the parts for domotic project. Asking if this scheme+code will work on: August 11, 2013, 10:45:28 pm
Thanks for the reply. I didn't plan to buy a breakout board, the idea was buying two cheap relays like in the photo ( http://www.fasttech.com/products/0/10000012/1001100-ttl-250v10a-ac-relay-module ) and mount them on a breadboard. Is it safe? Also note that an arduino nano clone costs about 8$, so if the chances that something will go wrong are low, it's cheaper an arduino reemplacement.

I forgot to say that I already have an IR receiver and it works very well too  smiley

1) The product you're reffering to is a breakout board. Only relay would mean no PCB. But the one you're referring to has a PCB and a transistor. You can use it.
2) You can connect the arduino and relay using female to female jumper wires. Using a breadboard may cause problems.
3) Be sure you don't touch the bottom of the relay board with a conductor like metal or the cement wall directly.
4) You can mount it all in a plastic box.
5) Be careful and happy automation.
11  Using Arduino / Project Guidance / Re: About to buy the parts for domotic project. Asking if this scheme+code will work on: August 11, 2013, 06:42:57 pm
It is a very simple project. Easily doable. Be sure to buy opto isolated relay breakout boards instead of normal ones. They protect the arduino in case something goes wrong. For IR sensor I found TSOP 1738 to work best.
12  Community / Bar Sport / Re: Your latest purchase on: August 11, 2013, 01:43:43 am
Purchased an SD Card module and an ADXL345 accelerometer.
13  Using Arduino / Project Guidance / Re: how to connect a phone-camera to a PC via USB? on: August 09, 2013, 07:26:29 am
Actually there is a way to do this. I'm surprised no one here knows this. There are apps for android that can make android phone act as a web cam.

Some of them are "Droid cam" and the open source "Smart cam". Use can use bluetooth, Wifi or USB.
14  Using Arduino / Project Guidance / Running a 9g servo from Arduino's power. on: July 26, 2013, 04:59:54 am
I took the risk of running a 9g servo from arduino's power (5v). It ran fine and the arduino's voltage regulator did not blow. But I wonder if running a 9g servo with arduino's power will not cause problems. Like when the servo's movement is stopped an obstacle and it draws more current.

Also when I ran the "Sweep" code. It was not at all smooth. It was very jittery. Changing the delay value may change that.

If anyone wants to know, it costs around 6$ http://www.bhashatech.com/motors/81-micro-servo-motor.html . That's a bit higher than the China sellers, but where I live importing is a pain.
15  Using Arduino / Project Guidance / RFID security. on: July 23, 2013, 01:50:58 am
I am considering getting an RFID module because I found one just for 3$ here http://nskelectronics.com/rfid-_ttl.html. That is really an amazing price.
But I was considering the security issues. Besides RFID cloning I found one more security issue. The reader communicates using serial. So the RFID reader has to be placed near the door away from the Arduino. So one could just remove the RFID module and make a micocontroller tell the arduino that it read the tag of the choice of the attacker.

I also noticed the same problem with Finger print scanners. You could just make an arduino act like a finger print scanner and fool the system. Is there a work around for this.
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