How To: Build a Cheap Arduino Tachometer to Measure the RPMs of Spinning Fans (And More)
A tachometer, or RPM counter, is a device that measures the speed of something that's rotating. In a car with a manual transmission, the tachometer can be helpful in determining when to release the clutch and how much gas to give when you're taking off. This DIY Arduino Tachometer by Chris on PyroElectro uses an infrared transmitter and receiver break-beam pair to measure the RPM of a computer fan. Image via pyroelectro.com When the fan blade passes between the transmitter and receiver, the IR beam counts the interruption. The fan has seven blades, so seven interruptions equal one rotation. Image via pyroelectro.com You can use a break-beam system for other things as well, like knowing when a door is opened or closed. If you want to build your own tachometer, you can find step-by-step instructions and schematics on Chris's post. Check out the video to see how it works. Please enable JavaScript to watch this video.
I wonder what else this could be used for... maybe it could be attached to a bike? Do you have any other ideas?
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A communication system pretty much always breaks down to two parts, a transmitter and a receiver. Laser communication systems are no different: the laser is the transmitter and for the receiver we will use a photo-resistor. So really it's two circuits. For this project I am going to keep both of them very basic.
How to Build a Space Communication System Out of Lasers
Apple's highly anticipated iOS 11 is ready for the public, and besides the obvious array of new features and improvements, the mobile OS also comes with stunning new wallpapers which would look amazing on any iPad, iPhone, or iPod touch — even on Android devices.
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If this is your first time with an Android device, 100 apps might be overwhelming right off the bat. Take a look at our list of 10 must-have Android apps instead, to cover all the basics. If your
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Make an antigravity toy with just some magnets, a pyrex bowl, coper wire, a playing card and some aluminium foil. This is really cool! You can even interact with the flying card when the bowl is shut!
How to make a homemade anti-gravity toy - Is it - youtube.com
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How to Enable Intelligent Scan. When you first set up your Galaxy S9, you'll be prompted to setup Intelligent Scan automatically. Just follow the prompts to scan your face and irises and enter a backup PIN, password, or pattern when asked.
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Well, everyone's different, and if you're looking for ways to beef up your Reddit experience, try out the Chrome extension SHINE. Created by Gusto Creative House, SHINE changes the user interface of Reddit in order to bring even more focus to the content, making it easier to search, browse, and create posts than with the standard UI.
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