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How To Blink a LED With Arduino In Sinhala  Arduino මුලධර්ම භාවිතයෙන් පහසුවෙන් LED බල්බයක් නිවී නිවී දැල්වෙන අවස්ථාව උදා වීම සහ එමගින් ඉතා සාර්ථක ආලෝක රටාවක් සැකසා ගැනීම වනතෙක් සියළු පියවර අන්තර්ගතව ඔබ වෙත  ඉදිරිපත් කරන  වීඩියෝවයි මේ! In this video we need;  Output pins of the Ardunio board has the ability to give around 20 mA per I/O pin. This 20 mA is more than enough to switch on an LED. Rather than using the full current we are to limit the current by using a resistor in series. A good resistor value is 330 ohms. (use can use any resistor between 150 – 330 ohms) Steps : Connect the Arduino board to the computer via the USB cable. Open up Arduino IDE. Select the correct COM Port. Select the correct Board . Type the code and Upload. Code and Tutorial PDF Zip - https://drive.google.com/open?id=0B-xkwb9ASKxXWmhSOTdFTjlGTDQ
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Fixed 5V regulator Using 7805 In Sinhala

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5V Regulator එකක් භාවිතා කර Phone Charger එකක් නිර්මාණය කරමු! The 78xx is a series of fixed-voltage integrated-circuit voltage  regulators designed for a wide range of applications. The Ic can handle upto about 1.5A of current. Working temperature 0 – 125 º Celsius Examples : -7805 (5v regulator Ic)  -7812 (12v regulator Ic) Properties : -Thermal shutdown features. -Overload current limiting features. -High power dissipation capability. -Bias current (~1–10mA). Part List: 7805 IC 0.33 μF 0.1 μF When the circuit is set you can successfully obtain 5v output from a varying dc voltage source (7-25V). The capacitors helps to stabilize and filter noise of the input.  Applications: Powering a micro controller Making a mobile phone charger 7805 regulators are cheap and efficient. Visit our web site : www.vikilab.com References : LM7805 Data Sheet @  https://www.sparkfun.com/datasheets/C...
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Dark Sensitive Circuit With C828 Transistor In Sinhala

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අදුරට සංවේදී පරිපටයක් සකස් කර ගන්නා ආකාරය සරල සිංහලෙන්. Dark sensitive circuits have a range of applications such as turning on lights when the light level falls below a certain threshold.In our circuit this threshold is changed by using a variable resistor which can be turned to fine tune the circuit. The circuit consists of the following components: C828 transistor x1 7805 voltage regulator x1 1 kilo ohms resistor x1 LDR x1 LED x1 100 kilo ohms variable resistor.  The base current of the transistor is controlled by the potentiometer.In very low light conditions the ldr will have a very high resistance and in high light conditions the ldr will have a low resistance.In the dark condition less current will flow through the ldr so more current passes through the base of the transistor causing a high current flow through the led via the collector pin of the transistor causing the led to light up but in high light condtions the ldr will have a low resistance there for most...
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