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1921  Using Arduino / Project Guidance / Re: Moveing from the breadbox on: March 08, 2013, 09:41:27 am
Do you need the whole Arduino or would a stand-alone AVR chip  with a few parts do the job?

Doing it or having it done with the much smaller surface-mount parts, you may achieve a tiny package that will fit in an enclosure maybe the size of a lighter.

But otherwise the standard to aim for is an Altoids tin or similar.
1922  Using Arduino / Project Guidance / Re: Measuring the weight of a beehive on: March 08, 2013, 09:35:32 am
That's great! The world does need more bees.
1923  Using Arduino / Project Guidance / Re: Measuring the weight of a beehive on: March 08, 2013, 05:52:21 am
I'd suggest using magnets and coils to raise the hive instead of a balloon but the fields might have a long term effect on the bees.



1924  Community / Bar Sport / Re: USPS out to kill hobby shipping on: March 08, 2013, 05:42:42 am
Quote
So USPS pricing does not make sense

Tell that to their pensioners, and healthcare provider. It's their healthcare and pension costs that is out of control and that's why USPS is in the deep hellhole it is right now.

And their only solution to their out-of-control costs problem is to try increasing revenue by raising rates for all of us.


There has already been one post in this thread explaining how USPS has to pay 2x more into those funds than other federal agencies because they've been marked for extinction.

But the real big evidence that they are not leeches on society is the comparison between USPS and private agencies that charge much much more.

We have out-of-control costs because resources have getting shorter for over 40 years and a small segment of the population takes an ever-increasing amount to themselves. The numbers you see are a direct result of that and the inflation used to keep it going. Instead of everyone slowing down a little, a few have rocketed up higher than ever in history while the majority have lost out more every year, and still you get guys whose idea of economy fits that of the US in 1770 or Old Testament times.

The US budget info has been published since 1910. The numbers are there. Every time we have a war the debt has jacked up significantly. Every time the War-Borrowing Spree has ended it's only a while before the poor get blamed for higher prices and then we have -another- war. Look at the data, look at the years, look at the price indexes and if you can still say war is good for the economy or that war has not been the major driver of national debt then you shouldn't do math beyond checking your change at the counter.

1925  Using Arduino / Project Guidance / Re: Trouble aligning laser diodes on: March 07, 2013, 08:21:40 pm
Yeah but will it be enough?

You see what I mean about lever arm? It's like having a big dial vs a small dial to fine tune a radio. The diodes are small diameter so hard to adjust.

Another thought that might be better for staying aimed... put the diodes in ping-pong balls or the like and cut holes to hold them in stiff foam. Then turn the smooth ball to adjust aim and see if the foam holds it there. If the foam has some spring-back you might have to wiggle the ball as you aim or shave the hole a bit bigger. It's possible that square holes will do but I'd try round ones first.

That idea has the lever arm and a possible way to hold aim. Call it laser ball turrets.
 
1926  Using Arduino / Project Guidance / Re: Covering robot with metal on: March 07, 2013, 08:08:11 pm
Silver mylar?

Too bad you need so many sq ft. Joe Barker wrote a book on making models from soda and beer can metal.

Don't laugh too hard, can metal is plated to make the labels stand out. Some cans like Coors are highly shiny silver and some cans have a gold-color plating. The book covers recovering metal from the cans, removing the painted label and aspects of joins and all. The results just look fantastic. Check that bottom model;
http://www.fiddlersgreen.net/other/WSAM-Explained/sodacans/sodacans.htm

1927  Using Arduino / Project Guidance / Re: Record Changes in Height of Book Stack - Best Sensor? on: March 07, 2013, 07:23:16 pm
If the inside of the box is well illuminated then you only need detectors that the book spines would block or not. Maybe drill holes through the vertical slats and put the detectors in, but if the books are thin that would be a LOT of detectors needing to be wired. Good news is a bag of detectors might run 5 cents each.

I was looking at fiber optic cable, to feed the light from many to 1 phototransistor but wow, the cable I see costs more than detectors and wire!

You could try ultrasonic sensing from above the box. Check them on eBay, they're cheap.
http://www.ebay.com/itm/HC-SR04-Ultrasound-Wave-Detector-Range-Ultrasonic-Sensor-Distance-Module-/200896270284?pt=LH_DefaultDomain_0&hash=item2ec659cfcc
This looks the same as the ones I got from LC Tech. It's supposed to be good to 2mm but I didn't get that in quick testing. Getting it right should be a little problematic.

Quote
There is a 2" slit in front of the box which allows you to see the spine of the book.  In other words you can see that there are still books in the box without looking into it from the top.

That presents single detector possibilities but they would have to be positioned in front of the box.





1928  Using Arduino / Project Guidance / Re: Measuring the weight of a beehive on: March 07, 2013, 05:59:27 pm
I'm not sure that this will be good for beehives but if you have a mass that can move freely and an accurate accelerometer, especially at low G's, then if you apply a known force... F=MA.



1929  Using Arduino / Project Guidance / Re: Doppler Speed Radar on: March 07, 2013, 05:45:12 pm
Can you give it more power?

Also what you reflect from, smooth metal is best and for testing a corner reflector will send the most back. If you take a box and cut so there are 3 sides together making a corner then line the inside of that with smooth foil (try not to wrinkle) you will have a cheap corner reflector. Make it not small. Even if the reflector is not pointing directly at the source, the geometry will send the waves back. It works with light, it should work with radar.

Last is movement. The object must move relative to the radar either toward or away though sideways can be mixed in.
1930  Using Arduino / Sensors / Re: DS18B20 multiple sensors on: March 07, 2013, 04:03:35 pm
So long Troll.
1931  Using Arduino / Sensors / Re: Measure nightsky with TSL237 on: March 07, 2013, 02:30:18 pm
I am learning along here, i am trying out different float, unsigned longs etc... i have also got my "cheat-code" to work... i tried the freqmeasure.h and that worked like a charm...

donĀ“t get me wrong here, i like to learn and i am listening to all of you! big thumbs up for you guys! So while i try to compile my "own" code i also trying librarys with examplecode...

just sharing what i tried yesterday, i also tried to add a button so i can choose when i want to take a reading.

Good move with the button.

When you use floating point constants like the 22 in
Code:
const float A = 22;

it's good to put in a decimal just to be sure, like how the UL goes on
Code:
const unsigned long U = 12345UL;

and usually people would write 22.0 instead of 22., I guess for easy reading.

Most of the time the compiler will get it right or it won't matter but it can gitcha and those bugs can be a real pain.

Keep on with the updates!



1932  Community / Bar Sport / Re: USPS out to kill hobby shipping on: March 07, 2013, 02:19:04 pm
For important parts it's well worth the extra. I guess you don't sell toys?  smiley-mr-green

1933  Using Arduino / Sensors / Re: DS18B20 multiple sensors on: March 07, 2013, 09:48:19 am
I hereby admit to being an ass to an asshole.

1934  Using Arduino / Sensors / Re: DS18B20 multiple sensors on: March 07, 2013, 07:56:56 am
Let me know when you've sobered up or your head gets down to regular size or they find the right meds for you, whatever.



1935  Using Arduino / Sensors / Re: DS18B20 multiple sensors on: March 07, 2013, 06:50:57 am
You can go through this forum and find many posts where I spell out 20 mA per pin and 200 mA total as recommended and not bright to exceed. My feeling is that the less you pull from the Arduino, the better.

But when someone says the SOS about me again and again despite me writing different, I might just pull their tail to see if they even notice and maybe got a hair across a sensitive spot.

Why would ATMEL say pulling 40 mA for extended periods MAY permanently damage the machine if that is no way true? Go climb up their butts. Maybe you will learn something you didn't expect.

As for me, I can see you do miss things and have your dearly held practices as I have mine but what is possible and can work doesn't care a bit for those.
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