Uber Home Automation w/ Arduino & Pi : Uber Sensor - General Build Instructions Here's a video demonstration of each element in the Uber Sensor. I'm not great with youtube, so please excuse the amateur effort here. Hopefully it's enough to show you what the setup is capable of. I combined several sensors into this wireless Uber Sensor node. This sensor is powered via USB adapter, but it communicates wirelessly to the gateway, so you can place this where ever it has access to a power outlet.
Repel Mosquitos, Dogs, & Annoying Friends with High-Frequency Tones on Android « Android Gadget Hacks Repel Mosquitos, Dogs, & Annoying Friends with High-Frequency Tones on Android There are few sounds that actually make me cringe whenever I hear them: silverware scraping on a plate, nails scratching on a chalkboard, and piercing high-frequency tones. While the former two terrors require some physical hardware, sending out high-frequency sounds is as easy as downloading an app. Of course, since high-frequency sounds are terrible things to hear, this app is great for classroom and office pranks, or quite possibly fending off dogs and bugs.
12V to 120V Inverter Q1 and Q2, as well as T1, determine how much wattage the inverter can supply. With Q1,Q2=2N3055 and T1= 15 A, the inverter can supply about 300 watts. Larger transformers and more powerful transistors can be substituted for T1, Q1 and Q2 for more power.The easiest and least expensive way to get a large T1 is to re-wind an old microwave transformer. These transformers are rated at about 1KW and are perfect.
Free Circuit Simulator-Circuit Design and Simulation Software List Hello friends, I hope you all got benefited with our previous article on Electronic circuit drawing softwares . Today we are bringing you a great collection of circuit simulators – which are at the same time can be used for circuit drawing, circuit design and analysis as well. The list is well structured as free circuit simulation softwares, open source circuit analysis and simulation software, simple and easy to use simulators, linux based simulator, windows based simulator etc. Finally after researching through all the list we have compiled a collection best circuit simulation softwares as well. KTOWN's Ultimate Creating Parts in Eagle Tutorial Now that we've specified the size of our new pad (0.6 x 0.6 mm in this case), it's time to place it in our package. This is where you really need to have a bit of attention to detail, since pad size and placement is critical to creating a functional and manufacturable footprint! Selecting the 'Smd' tool (the red box in bottom of the the left-hand toolbar), and adjusting the 'Smd Size' to 0.6 x 0.6 on a mm grid, we should see something similar to the following if you zoom in or out a bit: If you zoom in, you can see that this pad is indeed 0.6mm x 0.6mm thanks to the 0.1mm grid lines we've set. The pad should align perfectly with six 'squares' in each direction on the grid.
Types of Skills Everyone Should Know – Video – Top 100 Important Skills 3. Split Firewood Seasoned splitters use a maul, not an ax, to prep firewood. (With its slim taper, an ax head often gets stuck in the end grain.) Don't use a chopping block—it reduces the arc of the swing, which decreases power. Instead, place the log on the ground, 5 in. closer than the length of the maul handle. Biquad Antenna Construction Biquad Antenna Construction (first published September 2002) This page details the construction of a biquad antenna. The biquad antenna is easy to build, and provides a reliable 11dBi gain, with a fairly wide beamwidth.
Toolbox Review: iMSO-104 Oscilloscope for iPad & iPhone Oscium’s iMSO-104 hardware offers to turn your iPhone, iPad, or iPod Touch into a 12MSPS digital oscilloscope with an analog bandwidth of 5MHz. For folks like me with limited desk space & shifting work environments, that’s an interesting offer indeed. Oscium sent over a test model to take for a spin, so onto the spinning! Using EAGLE: Board Layout Favorited Favorite 1 EAGLE’s board designer is where a good portion of the magic happens. It’s here where the dimensions of the board come together, parts are arranged, and connected by copper traces. In the board editor, the conceptual, idealized schematic you’ve designed becomes a precisely dimensioned and routed PCB. In this tutorial we’ll cover every step in EAGLE PCB design: from placing parts, to routing them, to generating gerber files to send to a fab house. We’ll also go over the basics of EAGLE’s board editor, beginning with explaining how the layers in EAGLE match up to the layers of a PCB.
Fake TV - Burglar Deterrent I was shopping around on Amazon the other day and came across a product that I thought was genius. It is called Fake TV and it acts as a burglar deterrent while you are away from the house. At night, the Fake TV turns on and uses a series of LEDs to project random colors that looks as though someone is inside watching TV when viewed through curtains or shades. There are some videos of it in action on YouTube and I have to say it really does look like someone is inside watching TV. This should scare off the large majority of petty thieves that are just looking for the quick opportunity.
EMP/HERF SHOCK PULSE GENERATORS Output terminals may be adapted for a wave guide for more precise applications or connection to an external antenna where you can experiment with maximizing "E" or "M" field for certain applications. Unit can be built in a military gray PVC enclosure measuring 10 to 12 inches. *Assembled units are sold only to qualified personal who submit their order on a company letter head. Sold only to qualified research companies and personnel