Show Posts
Pages: 1 ... 70 71 [72] 73 74 ... 93
1066  Using Arduino / General Electronics / Re: 2.4ghz camera interference help please! on: February 06, 2012, 03:17:06 pm
These are only 5g and $1.  Waiting...
http://www.hobbyking.com/buddy.asp?code=3B2ED0B9-9D14-48A4-BD3B-9318391DA1FD
1067  Community / Exhibition / Gallery / Re: Manchester encoding library for RF links. on: February 05, 2012, 10:20:33 am
Can you show us an example of the hardware?  Which RF module?
1068  Using Arduino / General Electronics / Re: 2.4ghz camera interference help please! on: February 04, 2012, 10:33:37 pm
Yes, it is small, I saw the dimensions.  But 3.8g???  That's like 4 rubber bands in weight!  Will you weigh it?  I don't need the exact weight but I want to be sure it's <10g before I order it.
1069  Using Arduino / Project Guidance / Re: Arduino as a webcam.... on: February 04, 2012, 11:03:56 am
You can send a compressed JPG every 5 seconds.  But that's not what you asked for...
1070  Using Arduino / General Electronics / Re: 2.4ghz camera interference help please! on: February 03, 2012, 10:24:24 pm
I believe the other camera has less jello.  Still looking for a battery for it.
Does this really weight 3.8g? 
Do you believe it?
Sounds too good to be true.

http://www.tenergy.com/30530
1071  Using Arduino / General Electronics / Re: 2.4ghz camera interference help please! on: February 02, 2012, 01:46:50 pm
Finally a calm day without rain.  I have jello a few cycles per frame.  This means about 100hz.  Otherwise it is in focus. 
Does this work for severe rolling shutter?
http://www.guthspot.se/video/deshaker.htm#version%20history
I think not.  Any better software solutions?
1072  Using Arduino / General Electronics / Re: 2.4ghz camera interference help please! on: February 01, 2012, 11:05:10 pm
The tiny rubberband and styrofoam peanut don't weight much.  I am familiar with image stabilization.  These images were too bad to be fixed.  The low freq was the worst case of jello you can imagine.  The high freq made it look like every individual scan line was running like a painting that got wet.  Now it's just blurry, with low indoor lighting.  Gets sharp when the motor stops.
1073  Using Arduino / General Electronics / Re: 2.4ghz camera interference help please! on: February 01, 2012, 02:16:31 pm
Waiting for BL-5C.  Tried it with friends tiny camera.  First mounted tight against metal frame.  High frequency vibration in video.  Then tried loose rubberband to absorb vibration hanging it between struts.  Now low frequency like 30hz every other frame.  Something is mechanically unbalanced in the toy blades that I hadn't noticed before.  3rd tried soft foam peanut, tried both tight and loose rubberband squeezing it between the frame and camera.  Still vibration in video this time between the 2 other frequencies.  I bet it would work if I hang it by a string!  Allow it to rotate?  Any better ideas?

The problem is the heli is vibrating up and down in space.  I can show this by slowing down the video.  I can attach it in such a way that it cannot rotate the camera quickly.  Moving up and down 1mm on an axis does not change the image of a far away object.  So it must be changing the angle up and down?

At a low frequency about 30hz, and a high frequency near the motor speed.  No matter how I attach the camera...  IT IS TOO LIGHT!  It moves in space with the heli.  This is turning into a difficult mechanical engineering problem.  How do you design a spring or a foam pillow that absorbs the vibration?

I got it so it is just generally blurry inside, without enough light.  I think the light outside might solve the problem.  Depending on the camera it should change the virtual shutter speed?
1074  Using Arduino / General Electronics / Re: 2.4ghz camera interference help please! on: January 31, 2012, 11:01:42 am
23g is less than 43.  I think this will make a difference in how it flies.  Is this number correct?  Could it be?
If I cut your battery in 1/2 it would weight 22g.  Your price is not so different from $3 x2.
1075  Using Arduino / Programming Questions / Re: Code up for review... any (under)takers? on: January 31, 2012, 10:51:36 am
Can we have a summary of what it does?
1076  Using Arduino / Project Guidance / Re: Voice Scrambler on: January 31, 2012, 10:40:18 am
Certainly you could compress these MSBits of an audio stream like that.  But how about the next bit?  The LSB?  Wouldn't work.
1077  Using Arduino / Motors, Mechanics, and Power / Re: Help Microstepping! on: January 31, 2012, 10:18:54 am
Nice pseudocode Bettersense!
Try my code.  It's good to +-1/22 of a degree using half steps.
I tried microstepping with PWM, who would need 0.0004 degree steps?
0.0004 precision when stopping?
Can you think of an application for this?
Is there a narrow range of speeds where it would be smoother?
Under what mechanical circumstances would this matter?
I'd like to learn and add a feature to my library.
Can we see some example code?
I have seen that with a load, moving slow, with time between steps...
It gets stuck instead of moving 0.0004 degrees.
With less load it "jerks" moving nearly 1/11th of a degree at a time anyway, same as half steps.
Maybe someone might want 0.02 deg steps?
This would make it smoother at one specific speed only compared to half stepping.
I believe this technique is only useful with different hardware than 28BYJ.
Not sure what motor you have...
1078  Using Arduino / General Electronics / Re: 2.4ghz camera interference help please! on: January 30, 2012, 10:35:11 pm
Nokia BL-5C is only $3 on Ebay.  23 grams.  3.7V.  Can't beat it for the price.
It seems to me that Ebay can solve most engineering problems for us!

How can that weight be correct?  I have a bunch of tiny cell phone batteries around the house, and they all weigh at least 100g, most of them 120g.  I guess mine are not Li-ion?  Just looked they are.  How can this one be so light, with the same capacity in mAh?  For $3?  Is it a typo?  Anyone know?  How do they do that?  When none of the other brands are as light?
1079  Using Arduino / General Electronics / Re: 2.4ghz camera interference help please! on: January 30, 2012, 10:19:26 pm
It even works at 3.00V!  Unfortunately that's the loaded voltage of the Saft battery after 5 minutes...
It works IN the helicopter just fine with 1/2 a 9v battery.  I even got it off the ground.  But it's a little bit heavy.
I'm going to search for batteries online...
1080  Using Arduino / General Electronics / Re: 2.4ghz camera interference help please! on: January 30, 2012, 08:01:40 pm
At 5V I get the same results as without the 1/6th 9v battery + 2 ohms.  As soon as I turn on the motor with the stick on the transmitter it's complete snow.  It can't be that sensitive to voltage, or I'd have to retune it every minute as the battery is used.  There's a dial on the video receiver.  No retuning is needed with a 3.7v battery.  Even after hours, without the motor running.  Let me see if it runs on 3.4v.  If so I know what to do!

It runs on 3.3v, no re-tuning of the receiver needed as it goes down from 5v.  So I'm going to use the 3.6v Saft battery.  Then I will try a resistor between them to increase the life of it.  Ideas?
Pages: 1 ... 70 71 [72] 73 74 ... 93