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16  Using Arduino / Project Guidance / Re: Long range (10 meters and up) IR transmitter and reciever on: April 08, 2014, 03:45:52 pm
You should also specify what "10 meters and up" mean.
In this case the maximum required range is more important then the minimum.

Define "tiny cars". How big is tiny?

Is all this supposed to work inside or outside? Is the IR coming from the Sun going to be a problem?

Why not demodulate in hardware? There are cheap existing solutions, packed with an amplifier, just plug and play.
17  Using Arduino / Project Guidance / Re: Where to begin here...? on: April 08, 2014, 02:04:10 am
Well, that's not as interesting smiley

Anyway, you should start with each module separately. Get an LCD running and counting down on its own.
Then figure out the pressure sensor, or you could use a simple switch. I don't think you need a measurement of the pressure, just the information that a threshold is passed. A spring loaded switch would do the job as well, I suppose. Perhaps sitting surface of the chair could have a flap over its entire surface that is sitting on the switch. Something simple.
18  Using Arduino / Project Guidance / Re: Where to begin here...? on: April 08, 2014, 12:45:12 am
Is it a bomb?

Yes, Arduino would have no trouble doing it.
19  Using Arduino / Programming Questions / Re: n00b problem, can't get analogRead to work on: April 07, 2014, 03:37:11 pm
The files on the Google drive are not public, or something.
Post the schematic and the code here on the forums.
20  Using Arduino / Project Guidance / Re: fast movements triggers vibration on: April 07, 2014, 01:10:52 am
Gyro senses orientation, accelerometer senses acceleration.
Yes, you should have a threshold to trigger the vibration.
21  Using Arduino / Project Guidance / Re: Powered (automatic) rocker on: April 01, 2014, 12:15:50 pm
The frequency should be the natural frequency of the baby pendulum. Forcing any other frequency would be not only energy inefficient but, I would assume, also not comfortable.

+1 on the spring / tension cord coupling. Rigid connection would most likely result in damage to the motor and/or coupling. You would want to provide some breathing room for the moments when you put the baby in and out or when you want to take over and switch to "manual control".
22  Using Arduino / Project Guidance / Re: Powered (automatic) rocker on: April 01, 2014, 12:35:12 am
Following up on Peter's concern, this comes to mind.
23  Using Arduino / Project Guidance / Re: Multiple DSLR Triggers on: March 21, 2014, 02:10:50 pm
The really high speed shots are done by putting the camera in a dark room, pre-focus, and shoot for a long period of time, and then you engage the flash at the precise time you want (for example, n microseconds after a sound triggers for doing the popping balloon, breaking glass type shots).  Typically, you need to do it many, many times to get the timing just correct.
The really, really high speed photography is done with air gap flashes.
For the really, really, really, high speed photography there is this thing.

But back to the subject.
Synchronizing the triggering of multiple SLR cameras (or any camera with a mechanical shutter) could be affected by slightly different mechanisms in each individual camera, even if they are the same model.
24  Using Arduino / Project Guidance / Re: Multiple DSLR Triggers on: March 21, 2014, 12:59:12 am
Not if you use port manipulation.
But even without it, you can use one IO pin to control multiple optocouplers in connected parallel, like I said previously.
25  Using Arduino / General Electronics / Re: I hate surface mount soldering, (shopping question) on: March 20, 2014, 12:56:32 pm
Well, I did give you a fair warning.
smiley

But, back to serious discussion.
Why don't you pick up some breakout boards with the pitch you will need and take some random (cheapest) SMD chips of that size and practice. It doesn't matter if you burn them or if the soldering is botchy. You will certainly learn something and it might just as well be how to solder those little buggers.
26  Using Arduino / General Electronics / Re: I hate surface mount soldering, (shopping question) on: March 19, 2014, 11:34:48 am
ZIF sockets? However, that approach could get quite pricey if you need more than few chips.
27  Using Arduino / Programming Questions / Re: How does programming language relate to binary code? on: March 17, 2014, 11:43:11 am
Here's some info on compilers, assembly and machine code.
28  Using Arduino / Programming Questions / Re: complicated if statements on: March 17, 2014, 11:39:41 am
Not only that you can use brackets, you absolutely should use them in such cases, even where no brackets would work just as well.
You will avoid some hard to track bugs in similar situations where you have to use them but forgot.
29  Using Arduino / Project Guidance / Re: Multiple DSLR Triggers on: March 17, 2014, 01:02:43 am
Yes, exactly.
Here is one of many tutorials on the subject:
http://www.martyncurrey.com/?p=34
30  Using Arduino / Programming Questions / Re: Delay quicker then 1 milli on: March 16, 2014, 03:54:53 pm
I swear I knew there was something fishy, but just couldn't put my finger on it.
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