Cell Phone RF Radiation Detector LED

From rookieelectronics: This is my favorite project, its too simple and very interesting because it does not require any voltage source. it converts RF frequency waves from cell phone (whenever you call or send a text) to little current to flash a LED.

Actually this project is also called as LED power meter, it is used to test RF equipments. It can detect output power of our FM transmitters, by simply connecting voltmeter in the place of the load(LED) of this circuit.

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A Low-Voltage Cut-Off Switch

A Micro controller-based voltage cutoff circuit, currently in use on several motorcycles. It is designed to monitor the voltage level for the battery, and activate an accessory circuit when the level is sufficiently high. If the level drops below a calibrated level, the accessories are cut off. [Link]

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One million Raspberry Pi PCs Sold Since February Launch

The Raspberry Pi, a credit card-sized computer designed for tinkerers, has sold an impressive one million units since it's launch last year, the foundation detailed this weekend.

Developed in the UK by the Raspberry Pi Foundation, and launched in late-February at RS Components and Premier Farnell computer shops, the Raspberry Pi went quickly, selling out within minutes. Priced at under £22, the tiny computer has proved a fun project for household hacks and small computing tasks.

The ARM-based PC features a HMDI socket, a video output, two USB ports, Ethernet, audio output, and SD card slot. Power is provided either by a battery or a standard mobile phone charger.

The PC's focus on getting people programming looks to be well on its way to being accomplished, according to the numbers just released. The cute infographic below details that all of the Raspberry Pis sold weigh the same as 200,000 iPhone 5s, and stacked end to end would be taller than 111 Empire State Buildings.

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Start Your Car Using Your Cell Phone

This is the same technique used to launch fireworks with your cell phone. Instead of turning on the vibrate motor when someone calls, your car will start instead.A The phone can be kept charged by hooking it up to the cigarette lighter of your car (you can do this from behind the dashboard if you want it to be discreet).A You can also set alarms via your phone’s calendar. [Link]

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Gnomio Smart Watch for Windows Phone

The Gnomio is an innovative wrist watch designed for Windows Phone 8 smartphones. As we can see from the images, the smart watch comes in two models, both the model feature minimalistic and stylish design, while the black model also features an anodized aluminum watch case for premium look.

Moreover, each digital watch runs on Windows Embedded Compact 7 operating system, using built-in Bluetooth technology, the wrist watch is able to connect with your Windows Phone 8 smartphone, and notifying you through soft vibration about incoming calls, emails and messages, moreover, the smart watch can also access to Windows Phone Store for more apps.

Apart from that, other specs of the smart watch also include ARM 270MHz processor, 64MB DDR2 RAM, 8GB flash memory, a capacitive touchscreen display with 240 x 240 pixels resolution, 3-axis gyro, accelerometer, ambient light sensor, 3.5mm audio jack, built-in rechargeable battery and etc.

At present, the inventor of Gnomio is raising fund at Indiegogo. Pledging $81 will let you own the smart watch for Windows phone. If you’re interested, jump to Indigogo official site for more details.

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Make A Cheap USB Powered Fan

Find out how to make a cheap yet quite efficient fan from parts purchased at the dollar store. This fan can be made for about $2 (plus tax). It would be even better if you can get a double ended USB wire, in which case you could make 2 USB fans for $3 (plus tax). That definitely beats the $15 or $20 stores tend to charge for the same kind of devices.[Link]

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