HomePi – Starting with the LED board

As discussed in earlier blog-posts, I will show you how to build an LED controller to be ultimately controlled by the Google Home device. This article is the first in the series that actually talks about the components and we will start with the LEDs connected to our RaspberryPi.

LEDs

First of all we need some electrical engineering fundamentals (based on https://electronicsclub.info/leds.htm):

I own several red and green LEDs, so I will use them for my demo. Every LED must have a resistor connected in series to limit the current flowing through the LED, to prevent it froming burning out instantly. The Resistor value can be calculated with a simple formular

R = (VS – VL) / I 

R = resistor value in ohms (ohm).
VS = supply voltage.
VL = LED voltage (2V generally, or 4V for blue and white LEDs).
I = LED current in amps (A)

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i’m the first real smartwatch

Who of you did not dream of a watch that can call special agent X to support you. I you are still dreaming of this childhood fantasies, the i’m watch is the right gadget

The watch features a 1.54-inch curved capacitive TFT LCD with 240 x 240 pixel resolution, a first of its kind according to the company. It’s powered by a Freescale IMX233 application processor with 64MB of RAM and 4GB of flash storage for your media. It also packs in Bluetooth 2.1 + EDR for smartphone tethering and a 450mAh Li-Po battery that lasts about three hours on speakerphone use or up to two days in standby. Naturally, it also includes a mic, speaker, and headphone jack. Note, the I’m Watch, like Sony Ericsson’s LiveView, does not include a cellular radio (or SIM slot). The company claims compatibility with iPhone 3GS (with iOS 4.3 or superior), iPhone 4 / 4S, “Android phones” (all of them?), and then Blackberry and Windows Phone 7 sometime in 2012.

Most important: people won’t point at you playing with your cell phone to check g+, twitter or facebook anymore.. Just pretend that you’re checking your time.

http://vimeo.com/31092958

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