Arduino Tutorials

Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It's intended for artists, designers, hobbyists, and anyone interested in creating interactive objects or environments.
There are many variants of Arduino boards available in the market.The boards can be built by hand or purchased preassembled; the software can be downloaded for free. The hardware reference designs (CAD files) are available under an open-source license, you are free to adapt them to your needs.

Tutorial description and links

Chapter Zero:Introduction to the Arduino system, Basic digital outputs, Lots of blinking LEDs!
Chapter One :learn about electricity, the for loop, random numbers, pulse-width modulation, fun with RGB LEDs , reading analogue inputs, building a voltmeter
Chapter Two : sensing temperature with the Analog Devices TMP36, sending data back to the host PC with the serial outputs ,libraries, using parallel LCD screens, building a digital thermometer
Chapter Three: controlling relays to switch heavy current loads, creating your own functions ,interrupts, having lots of fun with servos, building an analogue electronic thermometer

Auxiliary LED lamp with a 60W Lamp

The Auxiliary LED lamp circuit controls power to a 60 W lamp and also generates an auxiliary 14v Dc supply which can light a 12 LED array.

AC Power LED Lightning

The Schematic shown below works for a 120v 50Hz supply . The capacitor is used to limit the AC Current through the  LED’s. The LED’s are arranged in two rows each containing 14 LED’s. A metal oxide resistor(1k ohm ,1W)  is connected in series to the capacitor to act as a fuse an to limit the peak current. The capacitor value (0.47uF ) for a 120 V supply keeps the current limited to about 20ma. When the device is powered by 240 V supply a 0.22uf ,400 V capacitor must be  used.