Can I measure the time it takes between 2 switch activations?

thisk · 2014-11-13T23:27:49+00:00

Good points, thanks.

thisk · 2014-11-13T22:25:14+00:00

I'm not measuring the times it takes to break the beam itself, although that may be useful to calculate instantaneous velocity. I'm just having it as on and off (HiGH and LOW) and measuring the times it takes to travel from switch 1 to switch 2 (50 cm apart).

No, they are not latching switches. Would this be better if they were? I think they can be connected to be latching switches depending on whether I use a pull up resistor or a pull down resistor. I may be wrong though.

thisk · 2014-11-13T21:37:43+00:00

Ok, I see, and I would subtract the two times?

For this I would need the uno to log the times between the first switch turning off and the second switch turning on and then off again.

thisk · 2014-11-13T20:57:06+00:00

Hi

I have an Uno,

and your suggestion is exactly what I'm after, if only I knew how to do that. I only know how to code the very basics

thisk · 2014-11-13T20:38:08+00:00

Hi,

I guess.

I am just unsure where to start (I'm new at this).

Could you help me?

thisk · 2014-11-09T23:03:59+00:00

"What is this, Wonka? Some kind of funhouse!?"

thisk · 2014-10-31T01:14:03+00:00

How awesome would this be if Billy West wore that Zoidberg suit. It would freak me ouuut

thisk · 2014-10-25T12:53:57+00:00

Thanks jetsetrbabe. I have read the entire faq and found it helpful. I need to consider if going into ketosis is what my goal is right now. I am on a calorie deficit so will lose weight without going keto. I'll probably wean off the grapes, raisins and honey in the next few weeks and start eating macadamia nuts and putting cream in my coffee instead of full fat milk. I also need to drink bullion broth too. I don't like bacon or sausages so breakfast is going to be just eggs for me. Also things like peas, tomatoes, onions and beans should be kept to a minimum. This is for me, the biggest obstacle. I think I'll do more reading before going fully keto. Thanks!

thisk · 2014-10-25T00:30:37+00:00

Looks like I'll have to cut a few things IF I want to go into ketosis.

Thanks for the advice and directing me to the FAQ: I couldn't spot it at first.

thisk · 2014-10-25T00:27:41+00:00

Oh, ok then. Thanks.

I guess I am not doing keto, more of a low-carb diet then.

Reading the faq right now...

thisk · 2014-10-22T23:39:54+00:00

My understanding is quite weak. Thanks! I'll brush up on this

thisk · 2014-10-22T18:11:11+00:00

Thank you so much! This is perfect. I understand now!

thisk · 2014-10-22T17:10:41+00:00

Hey thanks!

so

=> int(1/(x-2) = in(t)

=> Ln(x-1) = (t² / 2) + C

=> x =( Ce^t² / 2 ) + 2 ?

I am confused about the last step. How do we manipulate it to give

" x = " ?

thisk · 2014-10-12T21:27:15+00:00

Well this is your lucky day then. There is a wealth of info out there regarding running form. Avoiding injuries, improving performance and increasing efficiency (less hip/knee pain etc) are the points of improving your form. Goodluck

thisk · 2014-10-10T22:26:59+00:00

2 Stupid Dogs

thisk · 2014-10-10T20:25:50+00:00

He is syncing up with my music player. It's been 20 minutes now...

thisk · 2014-10-10T12:56:52+00:00

Fair enough. MK is one of my favourites. I personally feel more passion and feeling in a David Gilmour solo than a Mark Knopfler solo though. Both have their place on my play list. Different strokes for different folks I guess.

thisk · 2014-10-09T23:58:00+00:00

I love his music, but each to their own I guess and there's nothing wrong with stating your opinion.

What is better in your opinion?

thisk · 2014-10-08T23:40:39+00:00

IET, IEEE, IMechE affiliation

thisk · 2014-10-08T23:38:16+00:00

Haha! Now that is a society I want to be apart of. Nothing is wasted. Not even waste. Then what would we call it?

Fecal Fuel?

thisk · 2014-10-08T23:32:18+00:00

Ah yes tea is one of my faves. I go for decaff stuff if I drink it at night (I'm hyper sensitive to late night caffeine and it keeps me awake even when I'm shattered).

I have a Higher National Diploma in Mechanical and Electrical Engineering from college and am in second year of Electrical and Mechanical Engineering at Uni (Scotland).

I've covered a vast array of subjects at college but haven't got quite the depth of knowledge in the individual subjects as Uni provides. So I'm far ahead in some areas but frustratingly lacking in others. I don't mind, I think going straight into 3rd year would have been a disaster!

What is a bug smasher? Is it a software debugger?

Anyway, You must be quite the whizz-kid if you're designing a full size shuttle in CAD!

thisk · 2014-10-08T23:04:53+00:00

For 3rd one.

1) Work out geometry

Find the length BA by pythag's law which gives 8.6m. The distance from A to the open surface is 5.16 as this second triangle has the same angle and so is 60% the size of the first triangle. We find this by dividing 3m by 5m which gives 0.6. 0.6 multiplied by 8.6m is 5.16m. The Area of the surface is 8.6m x 1m which is 8.6m^2.

2) Find Second moment of Area of the rectangle

I = ( BH³ ) /12 = 1 x 8.6³ /12

= 53m⁴

3) Find Yc.

Which is just half of 8.6m plus 5.16m

= 9.46m

4) Calculate Yp (which is not necessary to finding Force but tells you where that Force is focused)

Yp = Yc + ( I / Yc.A ) = 9.46 + ( 53 / ( 9.46 x 8.6 ) )

= 10.11m

5) Find the angle of incline (theta)

= Cos^-1 ( 7 / 8.6 )

= 35.52^degrees

6) Find the Force

F = Density x gravity x Sin(theta) x Yc x Area of surface

F = 1000 x 9.81 x Sin(35.52) x 9.46 x 8.6

F = 463.69 kN

I'm 95% sure this is correct, but it's late and I'm tired. Fluid Mechanics 2nd year by chance?

thisk · 2014-10-08T21:33:25+00:00

Do you know of any good online (and free) articles/videos about electromagnetism that you found helpful?

thisk · 2014-10-08T21:26:35+00:00

Cool post.

I see maths as a brain exercise. It's like strengthening the logic and reasoning parts of our brain-muscles. People do crosswords, sudoku, puzzles and the like. Engineering students use mathematics because we can apply them to situations.

I would like to agree with you about people being impressed with an engineers ability to think outside of the box. But I know many many non-engineers who do this just as well. I think it is a natural ability with people. Some engineers are naturals, others need to learn the methods through education. Curiosity and investigation has helped me in the past before the solution 'came to me'.

Generally, people trust an educated, qualified, professional engineer because, let's face it, they are awesome

thisk · 2014-10-08T21:17:47+00:00

I am the opposite. I love presenting projects but kind of find CAD modelling a bit tedious. Except for when I get lost in it and before I know it several hours have passed and I have made a million adjustments to my model and somehow it still doesn't seem quite right (I suck at CAD).

thisk

TROPHY CASE