Crazy Things you can do with your iPhone

Politcal Worker (100+ posts)
Well here are a few crazy things you could do with an iPhone.
1. Monitor your Heart Rate

The Heart Fitness app claims that it can effectively monitor your heart rate using only your iPhone. How in the world is that possible?
To accomplish this feat, the app takes advantage of both the camera and the bright LED on the back of your iPhone 4. First, you cover the light and the camera with your index finger. The light then illuminates your finger so that the camera reads that reddish color that results when you stick a flashlight up to your finger.
Here’s where the magic happens. As blood is pumped into your finger, the hue pulses. The camera reads this pulse and uses it to measure your heart rate! Pure voodoo right? Perhaps not. I tested the app on myself a few times and consistently came up with a measurement around 70BPM, which I confirmed by taking my own pulse manually. Then I got up and ran around for a while and used the app again, over 100BPM this time. As crazy as it sounds, it seems to work!
Now, many commenters note that they can get readings from every day items such as ketchup bottles, but this doesn’t prove anything. If you consider that the app reads pulses in color, pointing your camera at something red combined with camera-shake would produce a similar result. This proves that you can trick the app, but not that it doesn’t do what it claims

2. Scan Documents


You know that your iPhone has a camera on it, so it’s no surprise that it can take a photo of a document right? The problem with this though is that a handheld camera is a far cry from a flatbed scanner. Holding your phone perfectly level isn’t easy, even if you can pull it off, it’s still a hassle.
Genius Scan. With this app you can quickly snap a shot of any document without really thinking about how properly aligned it is on your screen.Genius Scan will automatically detect the edges of the document and allow you to quickly skew the perspective so that you get a perfect shot every time.You can save your documents as a PDF or JPG and even share them over Wifi for quick access from any computer.

3. Measure Almost Anything


You’ve seen measuring apps that simply place a ruler on your screen, which are great if you need to measure anything less than a few inches, but what if you want to measure an entire person or even a tree? For this feat you’ll need something more. Aim@ is a $0.99 application that pulls this seemingly impossible task off pretty well. By telling the app how tall you are and holding your phone at arm’s length, you can use your phone’s camera and a series of taps at strategic points to make approximate measurements.
I’ll warn you in advance, this app does work, but it’s a little quirky. If you’re not good at following directions, you’ll never get it to work. If you are reasonably patient, the app walks you through the specific processes for taking the height and width of an object, or even the distance from you to it. In my tests, when I didn’t screw up, I usually came within an inch or two of the actual size of the object

4. Take 3d Photos


This is another app that sounds like it’s more gimmick than reality, but it actually works! In fact, the technology really isn’t that amazing if you think about it. Your two eyes work together to help you perceive depth. By taking two photographs at slightly different positions, you can mimic this functionality. 3D Camera does exactly that. You take one photo, move over a few inches, snap another, then combine them to create a three-dimensional illusion.
3D Camera gives you three different options for viewing the resulting 3D image. The first is an anaglyph, which you can view with your typical cheap pair of red/cyan 3D glasses, a stereogram, which works just like the old
Magic Eye images (no glasses necessary), and a wigglegram, which simply changes from one image to the next quickly to simulate a 3D effect.

these apps are available on other platforms as well (Android or windows phones) but original article is only related with iphone .

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