arduino 2 inputs 2 outputs
Several jumper wires, a push button. An LED and a corresponding resistor, in my case, it’s a 120 ohm, so without any further delay, let’s get started, so the Arduino itself has 13 pins which are capable of doing digital inputs and outputs. They are located up here, along with the ground and the a RF pen, so for the first example, we’re going to use the thirteenth pin as long as as well as the led on the Arduino itself and for the second one we’re going to choose a different Pin and connect our led and the resistor to make it blink, so let’s get started with the software alright. So, in order for the LED on the pin 13 to blink, we have to write a series of instructions, so we’re going to define our LED to be on, pin 13 we’re going to write a setup function which is basically a function which defines any inputs and Outputs for the Arduino – and you know, and in our case the only pen were going to define, is going to be the pin 13. So a pen 13 output we’re going to create a void loop function, which is going to repeat until the Arduino is powered down and in this case we’re going to write a hi to the LED, followed by a half of a second dollar. So 500 milliseconds, followed by a digital write, LED low, which is going to turn that off another delay of 500 milliseconds and we’re going to close our loop.
So we need to verify the sketch and we’re going to upload it to the Arduino. So let’s see what it does. If you have done everything correctly and uploaded the sketch to the Arduino, you should see the LED blink every half of a second, so let’s do something more complicated and instead of having this LED blink, we’re going to use a breadboard, Billy small circuit with an LED And a resistor on it all right so for the second example, what we need to do is to run two wires, one from pin 12 and one from the ground pin of the Arduino onto the breadboard we’re, going to connect on LED in series with a resistor. Obviously, the pen of the positive pin of the LED is going to go into pin 12 and the negative pin of the LED is going to go into the resistor and that’s going to all go to the ground. So we need to make a small. We need to make a small modification to our program, so in this case, all we have to do is put pin 12 for the LED verify the sketch again and upload it to the Arduino and once we’re going to build the circuit, we can hook everything up And see how it looks like okay, so let’s build our circuit. One thing to pay attention to is that the longer lead of the LED is going to go into the positive pin or the pin or the pen 12 of the Arduino.
So we’re going to place it on the breadboard we’re, going to connect the n 12 to the positive lead we’re going to place our resistor on the second count of the LED and we’re going to plug in the ground, pin into the other end of the resistor. So let’s hook up the power to the Arduino and see what it does. As we expected. The LED on the pin 12 is now blinking for the final circuit, we’re, going to add a button tour board which is going to turn on and off the LED. So let’s take a quick look at how this is done. First of all, we’re going to put it on: pin 4 we’re going to have a pulldown resistor to the ground notice, how I broken out the ground, as well as the volts onto the breadboard rails. So this resistor is going to go straight to the ground, to keep the pen array low and when the button is pushed is going it’s going it’s going to go to the 5 volts rail, so it’s going to toggle between 0 and 5 volts we’re going to Also have to modify our program to include the button, so in this case, we’re going to add a button on pin 4 we’re going to have to include an additional definition of the input so button input and what we’re going to do here is replace the delays With an if statement so in this case, we’re going to do if digital read button and if it is equal to high.
So when the button is pressed, we are going to turn on the LED otherwise, or else the LED is going to have to be turned off so let’s quickly verify the sketch see if there’s any mistakes and we’re going to upload it to the Arduino and let’s. Take a look at the circuit, alright, so, as you can see, I have connected the circuit and you can see the button right below the LED. It is connected through a pulldown resistor to the ground, the the input the order reading on and 4 is connected to the button, as well as the pulldown resistor, and on the other side you have the button going to the high voltage rail, so I have uploaded The sketch and let’s take a look at what it does. So, as I push the button as expected, the LED is going on and off so everything works as expected and notice that in this case we don’t need any button debouncing, as some of you may be familiar with the term and we’re going to take a look At that in the next tutorial, so please comment subscribe and let me know if you want to see some something different or some different components for the Arduino.
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