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16  Community / Exhibition / Gallery / Re: Relaxino on: February 05, 2013, 06:45:10 am
Hi Mansoor,

I'm sure there will be people to help, make a new topic in the sensors section:


http://arduino.cc/forum/index.php/board,10.0.html

Quote
spring stretch (displacement) meter

Attach a circuit diagram and picture of your spring and device

Cheers
17  Topics / Device Hacking / Re: Android and Arduino development on: February 04, 2013, 02:54:15 pm
natashafatale32

It's off the subject somewhat but this might be useful about bluetooth:

http://arduino.cc/forum/index.php?topic=145374.new;topicseen

I'm going to get one of these devices  Multiwii MWC FC Bluetooth Module Use For Android

 in UK:

http://www.quadframes.co.uk/index.php?page=shop.product_details&flypage=yagendoo_VaMazing_2.tpl&product_id=176&category_id=60&option=com_virtuemart&Itemid=1&vmcchk=1&Itemid=1

18  Using Arduino / Project Guidance / Re: Cheap way to connect an Arduino to a Android Smartphone via bluetooth on: February 04, 2013, 09:59:08 am
Thanks for the input guys

I'll get myself one of those devices and play with it.

cheers
19  Using Arduino / Project Guidance / Re: Cheap way to connect an Arduino to a Android Smartphone via bluetooth on: February 04, 2013, 05:22:44 am
Hi teckel,

do you have any code examples of how to get this working with arduino and android?

cheers
20  Topics / Home Automation and Networked Objects / Re: Android application for control your arduino board on: February 04, 2013, 05:12:59 am
Please help some newbies to Android here and post some code snippets or tutorials.

Did you use the USB host shield or Andorid ADK mega or google adk?

Many Thanks
21  Topics / Device Hacking / Re: Android and Arduino development on: February 04, 2013, 05:08:20 am
Hi,

thanks for the book recommendation and links. I'll share anything I find that may be of use.

I'm following this tutorial today (Monday 4th Feb):
http://allaboutee.com/2011/12/31/arduino-adk-board-blink-an-led-with-your-phone-code-and-explanation/ This one is about sending data to the Arduino but there are ones to do it the other way around.

The people at circuits@home seem helpful with lots of useful post on their site, and they may also answer some posts on the blog.

Have you tried running any code yet?

Cheers
22  Topics / Device Hacking / Android and Arduino development on: February 02, 2013, 06:26:47 am
Hi,

I'm new to Android (some Java SE and xml, eclipse / netbeans experience), but I have been playing with Arduino (mostly Uno) for 18 months now. Is this the right place on the forum that I should post questions. I am using the Uno with a USB host shield (cicuits@home).

I think I don't have to buy an arduino (eg Arduino ADK Rev 3 Board) or google dev kit (very expensive and too complicated)  because I have most of the parts in my uno and USB shield. But I am not sure. My guess is that those new dev kits evolved from the work done by those guys who contribute to circuits@home (Oleg maybe?)

So this is my first question. Are the libraries and code examples for the Arduino ADK compatible with my (uno & shield) setup?

Many Thanks
23  Topics / Device Hacking / Re: Create a spark or burning coil with Arduino on: January 28, 2013, 03:02:12 pm
I don't think there are any relays on the standard arduino motor shield, it uses H-bridges on a chip.

You can use an arduino pin to get a transistor to trigger a relay. The relay can then switch 9v (say 2 Amps) this can make thin nichrome wire glow hot. Wrap the nichrome wire around a match (non safety type) and you have a homemade igniter. You could use a mosfet instead of a relay.

24  Topics / Device Hacking / Re: Create a spark or burning coil with Arduino on: January 28, 2013, 10:33:24 am
Have a look at this I made for remotely firing fireworks. I used an arduino to control a relay and nichrome wire.

http://www.youtube.com/watch?feature=player_embedded&v=LdICz38Yft4

All the information needed including videos and circuits is on the blog.

http://gampageek.blogspot.co.uk/2012/12/normal-0-false-false-false-en-gb-x-none.html
25  Community / Bar Sport / Re: People hate resistors for their LEDs on: January 17, 2013, 10:51:28 am
When doing a quick test, I like to plug one leg of a standard led into the Arduino female. I have some 560 Ohm resistors soldered onto flex jumper wires at one end, and  croc-clips on the other. This is so I can clip the croc onto the other LED leg, and plug the loose end of the resistor into another female. The croc-wire-resistor makes it easier to move between components and arduino pins.

Come to think of it a croc-resistor-croc might also be useful.



26  Community / Exhibition / Gallery / Re: Relaxino on: January 17, 2013, 10:36:58 am
I was at Uni in the 80's. Pre-web-istory and the fax-age !

They did put a sensor on my finger. I think, as you say, you can sense O2 and heat rate on the finger. I saw an article for the CES show in Las Vegas had medical sensors for mobile phones and some of these used the type of sensor you mention. Skin resistance sounds good.

I'll look at other sensors too for measuring stress / relaxation. Blood pressure comes to mind, but the devices used on me were really annoying, and involve arm-squeezing devices, motors etc...

I wonder if you can sense the pulse in the carotid artery made by the heart beating, and somehow calculate the energy in the wave, and correlate that with instantaneous blood pressure?  There seems to be quite a tangible displacement in that pulse.

I don't want to go the whole hog and make a lie-detector type device, but there must be something in between.

Cheers
27  Community / Bar Sport / Re: People hate resistors for their LEDs on: January 17, 2013, 09:41:37 am
Hi Guys,

hope this isn't a proverbial grandma-egg-sucking  moment, but you can get leds suitable for 5v use with built in resistors
UK: http://www.rapidonline.com/Electronic-Components/5mm-Red-LED-5V-60-150mcd-Diffused-55-2670/?source=googleps&utm_source=googleps

I think there are 12v ones too.


I don't like fritzing either, I prefer circuit diagrams every time.
28  Community / Exhibition / Gallery / Re: Relaxino on: January 17, 2013, 09:16:23 am
Hi Geoff,



Cheers, I'll take that on. I worried about that delay issue with interrupts, I should bite the bullet and improve the code.

Many Thanks

Craig
29  Community / Exhibition / Gallery / Re: Wall-E's Friend on: January 17, 2013, 08:26:39 am
Awesome!

That's inspirational and cute. I would like to have a go myself, so I'm looking forward to seeing more installments and especially code - do you have a Blog page?

30  Community / Exhibition / Gallery / Re: Relaxino on: January 17, 2013, 08:07:54 am
Thanks for the +ve feedback Geoff,

I agree with you 100%. I had a heart attack last summer so these things are uppermost in my mind. I use the breathing relaxation technique all the time, but now I have biofeedback too.

I wanted something that gave feedback which  correlated better with what you are feeling. As I said you can see the leds sync with you feeling the pulse on your neck. The 30 beat average is just to get a value to compare with the target.

I guess this could also be used for athletic training ie set high value targets and get simple visual biofeedback. I haven't tried it for that yet, but I think the chest-strap version of the pulse monitor would be more suitable, to cope with the constant jogging around https://digitalmeans.co.uk/shop/sensors-category/sensors-medical-category/grove-chest_strap_heart_rate_sensor. So setting upper and lower targets could be useful for training and cool-down.

You need to exercise when recovering from heart problems but within limits. It could help with that too because you can see when it changes over.

Did you see any problems with the code at all? My background is in Biology so I lack some confidence in the coding field.


Best Regards

Craig
 
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