To start, let’s open up the Arduino Intro app and tap on Project number 1, Blink, from the Projects tab. In this article, I’ll be using an Arduino Uno board, but you can use any Arduino board for this one.Īssembling the Components on the Breadboard Jumper wires come in different colors.Īgain, for our blinking LED project, you’ll be needing an LED, a 220-ohm resistor, jumper wires, and of course a breadboard and your Arduino board. For a 1 LED circuit, jumper wires are not necessarily required, but it’s good to practice using jumper wires as early as now. The jumper wires you use can either be commercially available jumper wires (usually with molded ends to make insertion into the breadboard easier) or you can make your own by cutting short strips of the stiff single core wire and stripping away about 1 inch from the end. Lastly, you’ll be needing some jumper wires. Therefore you don’t have to worry if it’s inverted or not. Resistors don’t have polarity, meaning they don’t have a positive and a negative side. A 220-ohm resistor has the colors red-red-brown. Resistors have color bands on them that let you know what value they have. Resistors have "color bands" that tell their resistance value.įor now, you can use a 220-ohm resistor. This is an entirely separate topic, so we’ll not talk about it in this article. According to Ohms Law, Voltage is equal to Current times Resistance. The value of resistance is known as ohms. To get the correct resistance, you need to know Ohm’s Law. If you want the LED to be dimmer, you could use a higher value of resistance. You use resistors to decrease voltage or current to other devices. Therefore, you need a resistor that will reduce the 5v to 2v and the current from 40mA to 35mA, if you want to display the LED at its maximum brightness.Ī resistor is a device designed to cause resistance to an electric current in order to cause a drop in voltage across its terminals. Anything higher than 2 volts may damage your LED. Now, each digital pin of the Arduino is outputting 5v DC at 40mA, and most LEDs require a voltage of 2v and a current of 35mA. The cathode can also be determined by a small flat portion along the side of the bulb. The positive side is also called the anode, while the negative side is called the cathode. LEDs can come in many shapes, colors, and sizes, for this video, you’ll be using a 5mm LED. The shorter leg, which is the negative side, is called the cathode. The longer leg, which is the positive side, is called the anode. An LED has two leads or sometimes called legs. A diode only allows electricity to flow through it one way, so if you hook it up backward, it won’t work. It will show you the materials you need, the breadboard diagram, and of course the Arduino code complete with comments. The Arduino Intro app contains a lot of Arduino projects to help you get started with Arduino. To help you make the proper connection, you can download the Learn Arduino Intro app from the Google Play store. An LED, which stands for Light-Emitting Diode, is a small electronic component that’s a bit like a lightbulb, but is more efficient and requires a lower voltage to operate.īefore we get to the programming part, let’s talk first about how to connect an LED to the Arduino microcontroller. The LED blinking sketch is the first program that you should run to test whether your Arduino board is working and is configured correctly. The equivalent in the micro-controller world, such as Arduino, is getting light to blink on and off. In most programming languages, you start with a program that simply prints “Hello, World” to the screen.
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