![]() It blinks the red one, it blinks the yellow. So once he enters it, then it just goes it blinks the red one. ![]() We prompt the user for the number of blinks and the void setup. We do the same thing for the yellow blinks, so we find out how many times he wants to blink and then we blink the red LED and then we blink the yellow, LED in this particular version of the program. We print out to the user serial monitor how many times do you want the red LED to blink? Then we wait for him to answer and then we read his answer into the variable num red blinks. You need to tell it whether it’s going to be an output or an input. We do our pin modes right any time, you’re going to use an art app in an Arduino. What we do is we turn the serial port on. So everything between those curly brackets is the void setup. It starts with the open curly bracket and it ends with the close curly bracket. Basically, if we look at this code up here at the top, we declare our variables then in our void setup, we put the things in the void setup that we want to do one time the void setup, like all clauses, they’re sort of like a paragraph. If you have not not been working with us, what we did in the last lesson is basically we’ve got a lot of programming tools under our belt already and it’s, starting to get pretty pretty fancy what we can do. Still with this with this LED circuit, so again go to lesson three, and if you need help getting that hooked up, go to lesson seven and you can get this code, so you can catch up without with where we are. ![]() So as you go through this series of lessons, we’re going to be over here, learning about programming and then over here learning about circuits and always our circuits and our programs working working together, but for right now, we’re going to do a couple more lessons. So for right now, in these lessons, we’re kind of working with this circuit and we’re learning a lot of programming very quickly, though we’re going to have these core programming skills and then we’re going to start expanding what we’re doing on the circuit side. Okay, you can kind of see what I’m doing here every lesson I just build a little bit on on the previous lesson and so far we haven’t changed the circuit, a lot because basically it’s hard to learn circuits and programming at the same time. Three and you can see how to hook this circuit up and then also, if you look at our resources for lesson number seven, which we’re on now, you can get this code that we’ve been building in this series of lessons. I will give you you can go there and go to lesson. The two LED circuit, if you need help hooking this up, we really went through it in quite a bit of detail in lesson number three and see the link down in the description of this video. We are still working on this LED circuit. Some people prefer, while loops 99 of the time, a job you could do with either a for loop or a while loop just to kind of catch you up where we are. Let’s take a look at the code.The truth is, you could do almost anything that you ever wanted to do with a for loop, but you do need to understand a while loop, because there might be a few unique circumstances that a while loop would be better than a for loop and also, you Might be looking at someone else’s code, and you might see this and think well, gee what’s, that about and so a while loop is just another way to loop. Then I added more code to change the output. I simply added the Serial.begin and Serial.println commands from AnalogReadSerial and added them to Fade. The code for this lesson comes from a combination of the Arduino Fading and Arduino AnalogReadSerial examples found in your Arduino IDE. ![]() The short leg of the LED is connected to ground. Digital pin 9 is connected to one end of the resistor and the long leg of the LED is connected to the other end of the resistor. The circuit is much the same as we’ve done for previous lessons in that we have an LED connected through a 330-ohm resistor. The plotter lets visualize the output while the monitor writes messages out in a readable format. Today, not only are we going to do an analog write, we will also take a look at the Serial Plotter and Serial Monitor, tools that are included with the Arduino IDE. This indicates that this pin can be used for PWM. Note in the photo below that pins 3, 5, 6, 9, 10, and 11 each have the ~ symbol next to it. My Arduino Uno offers digital pins 2 – 13. I highly recommend watching Paul McWhorter’s video on PWM for a detailed explanation of how it works. Today we will use analogWrite to do it in a similar way, but now we will use Pulse Width Modulation (PWM) over an analog pin. So far we’ve been writing digital signals to control an LED.
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