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31  Community / Bar Sport / Re: This cheap?! on: December 24, 2012, 04:20:27 am
I bought this one:

http://www.ebay.com/itm/New-5V-8-Channel-Relay-Module-Board-for-Arduino-PIC-AVR-MCU-DSP-ARM-Electronic-/170745298865?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item27c1367fb1 for under $10

was delivered to UK within 10 days. I also found it was great build quality and used in a project with 100% success (so far).

http://gampageek.blogspot.co.uk/2012/12/remote-controlled-eight-relay-board_10.html
32  Community / Bar Sport / Re: Sugru silicon stuff (self-setting rubber for DIY) on: December 24, 2012, 04:07:54 am
Hi,

I used Sugru quite a few things and it's good at joining things together. I found it expensive though.

I also use this two part epoxy putty which is great to work with:

http://www.milliput.com/home.htm

33  Community / Exhibition / Gallery / Re: Female version Seeeduino on: December 18, 2012, 02:16:34 pm
Arduino - we all accept this name and probably not all know what it means, we just got used to it (I think in Italian the "o" bit means it's masculine, but nobody cares).

Another silly name: if you have a strong girlfriend could you call her Arduina?

I think the market for this device could be for young people in general - as an adult I should leave well alone in trying to define what those youngsters might think about it. The best way is to ask them - the little people that will use it . The parents might want a say too, but I would ask them last  smiley 

34  Community / Exhibition / Gallery / Re: Wannabe Bond Villain at Work on: December 17, 2012, 08:23:17 am
Links for all parts of the project (mostly single pages as it's a blog):

PART I - Analogue Keypad as Input Device: http://gampageek.blogspot.co.uk/2012/11/remote-controlled-eight-relay-board.html
PART II - Using the RF12 Board by Jeelabs: http://gampageek.blogspot.co.uk/2012/11/remote-controlled-eight-relay-board_16.html
PART III - Eight-Relay Module: http://gampageek.blogspot.co.uk/2012/12/normal-0-false-false-false-en-gb-x-none.html
PART IV - An RC Firework Firing Device: http://gampageek.blogspot.co.uk/2012/12/remote-controlled-eight-relay-board.html
... snooze...zzzzzzzzzz  smiley
PART V - Hand-Held Transciever: http://gampageek.blogspot.co.uk/2012/12/part-v-control-side-is-hand-held.html
PART VI - Relay-Side Transceiver:  http://gampageek.blogspot.co.uk/2012/12/blog-post_9.html
PART VII - SOP and Tests: http://gampageek.blogspot.co.uk/2012/12/remote-controlled-eight-relay-board_10.html
PART VIII - 1st Tryout With Fireworks: http://gampageek.blogspot.co.uk/2012/12/blog-post.html

Seems endless - but that's it!  smiley-grin
35  Community / Exhibition / Gallery / Re: Wannabe Bond Villain at Work on: December 17, 2012, 07:48:23 am
Highlight videos:
(NB: the code is on my Google Drive - see blog for links)



36  Community / Exhibition / Gallery / Wannabe Bond Villain at Work on: December 17, 2012, 07:23:26 am
Hi,

This the first field-usable project I developed.

RC firework launcher inspired by retro Bond Villains. I plan to start my projects in Blogs. Then as they become further developed and coherent I want to migrate them to Wikis.

I find it helps with learning if I write things down, especially if I try to explain them to others. So here it is:

http://gampageek.blogspot.co.uk/2012/12/remote-controlled-eight-relay-board.html

I'm sure it can be improved, so constructive comments are very much appreciated.

Many Thanks
37  Community / Exhibition / Gallery / Re: Female version Seeeduino on: December 17, 2012, 06:55:08 am
Excellent! It's really cute and appealing (I'm a 50 year old blokey bloke by the way). Love the doll shape - similar to those ones that all fit inside each other. My wife is Polish and they play with those as kids - So that fits with shields going together.

Will be great for youngsters of both sexes. I'll ask my wife and her friends what they think too for a ladies perspective.

My suggestion for a name is not to go too nerdy and technical with it:

How about "Sheeduino" for a name?

I would buy it as a starter kit for youngsters in my family.

Cheers
38  Using Arduino / Motors, Mechanics, and Power / Re: Supercharging DC electric motors on: December 17, 2012, 06:30:44 am
Thanks MarkT,

my background is in ecotoxicology and biology (some school physics), so I think I'll have even more physics questions when these magnets arrive!

How can I readily measure torque in my home office?  I have a hobby PSU which will measure supplied volts and current draw and hobby multimeter.

One website says I should measure motor torque rating at point when the motor is stalled, when lifting a mass. If I measure current drawn at this point, with and without the magnets, does this give me a fair comparison?

Cheers
39  Using Arduino / Motors, Mechanics, and Power / Re: Supercharging DC electric motors on: December 15, 2012, 09:02:10 am
Thanks guys,

I think I get it now. I've ordered some curved magnets from these guys in the UK: http://www.first4magnets.com/mitre--arc-magnets-94-c.asp

When they arrive I'll do some experiments.

Cheers
40  Using Arduino / Motors, Mechanics, and Power / Re: Supercharging DC electric motors on: December 14, 2012, 08:44:28 am
Thanks,

that's a great idea. I'll do that too, I've got a cheap 6v model motor somewhere, but I'll have to buy some magnets first.

cheers
41  Using Arduino / Motors, Mechanics, and Power / Re: Supercharging DC electric motors on: December 14, 2012, 07:58:49 am
Thanks ash901226

Should go faster, but when I look at the second tutorial I see the voltage needle moving a lot which made me think voltages are higher and changing quickly.

Could this have a detrimental effect on the coils not just the bearings being worn faster? So eg it's a 6v max  motor, and I run it at 6v then add some strong magnets could that be equivalent ('ish) of running it say at 12v? I'm not suggesting a linear relationship here, just trying to visualise.

Code:
E (volts)  = (d [magnetic-flux] / dt) * N

So the EMF (E) = rate of change of magnetic flux with time, multiplied by the number of loops in the coil.

In my motor N is fixed, so the magnetic flux can be increased by the rare-earth magnets, hence EMF (volts) must increase. Is this right?
42  Using Arduino / Motors, Mechanics, and Power / Supercharging DC electric motors on: December 14, 2012, 07:03:41 am
Hi,

I wonder if it is safe to "supercharge" a DC motor like in this attached picture using strong rare earth magnets.

Wouldn't it produce larger voltages and currents in the motor and cause it to overheat? These links helped me revise some school-learned theory to me:

http://www.magnet.fsu.edu/education/tutorials/java/dcmotor/index.html

http://www.magnet.fsu.edu/education/tutorials/java/electromagneticinduction/index.html

Maybe at a lower level of supercharging it would just shorten the life of the motor, so yes, it's safe but there's a down side?

Does anyone have any useful links / advice on this?

Cheers
43  Using Arduino / Sensors / Re: worlds-smallest-sized-radar-system on: December 05, 2012, 01:34:04 pm
Thanks guys

 I'll have a look at those links.

Cheers
44  Using Arduino / Sensors / worlds-smallest-sized-radar-system on: December 05, 2012, 09:56:42 am
Hi, I found this link on the WWW.

http://www.gizmag.com/worlds-smallest-sized-radar-system/25152/

Is there anything similar already out there within (the reach of hobby folk like me) that could be use with an Arduino? Maybe with a range of say few a cm to a few metres? Tried some of the robotics sellers' websites, but no joy.

Cheers
45  Using Arduino / Sensors / Re: Keypad.h on: November 09, 2012, 02:23:08 pm
Many thanks again. I'll check it out.

I believe it's a good idea for me understand the stuff I'm using in more depth, now.

I've been using arduino for just over 12 months now.  It's a bit off post, but I just bought this book http://www.amazon.co.uk/Introduction-Embedded-Systems-Development-Environment/dp/1608454983/ref=sr_1_9?s=books&ie=UTF8&qid=1352488796&sr=1-9 to help speed the path to better understanding  smiley

Cheers
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