Use Serial.print() to Display Arduino output on your computer monitor: Part 1

Learn Programming and Electronics with Arduino

Learn Programming and Electronics with Arduino

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Battle Camp: Final 5 Episodes with Dana Moon + Interview with the Winner! 1:03:29

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Finally, we find out who is unbeatable, unhateable, and unbreakable in the final five episodes of Battle Camp Season One. Host Chris Burns is joined by the multi-talented comedian Dana Moon to relive the cockroach mac & cheese, Trey’s drag debut, and the final wheel spin. The Season One Winner joins Chris to debrief on strategy and dish on game play. Leave us a voice message at www.speakpipe.com/WeHaveTheReceipts Text us at (929) 487-3621 DM Chris @FatCarrieBradshaw on Instagram Follow We Have The Receipts wherever you listen, so you never miss an episode. Listen to more from Netflix Podcasts.…

לפני 8 שנים 8:36

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In this week’s episode, we will talk about the intricacies of the Serial.print() function.

This is the first part, of a two part series on the Serial.print() function. Here are the specific topics we will cover in this lesson:

Why would you want to use the Serial.print() function?
A brief overview of the Serial library
The basic use of the Serial.print() function

Like this video? Sign up for our FREE Arduino Crash Course to get more videos that don't assume you have a PhD.

Why Would You Want to Use the Serial.print() Function?

You may know that a function is a programming tool - it performs a specific task for you. The Serial.print() function’s task is to send information from your Arduino to your computer, so you can see the value displayed on your computer’s monitor.

There are an endless number of reasons you may want to send information from the Arduino to a computer display, but two reasons really stand out to me:

The first reason is being able to see information that you are generating with your Arduino.

For example, if you have a temperature sensor hooked up to your Arduino and you want to see the value that the temperature sensor is recording, then you can use the Serial.print() function to send the data to a computer monitor via the USB cable. If you open up the serial monitor window (Tools > Serial Monitor), you will see the values streaming in from the Arduino.

The other big reason to send information to a computer display using the Serial.print() function is for developing and debugging Arduino sketches.

Very often, when you are developing an Arduino sketch, what you end up coding does something differently than what you expected it to do. Maybe you have a variable that gets incremented every so often and blinks an LED when it reaches a threshold. When you upload the code to the Arduino, you notice that the LED is blinking more often than it should.

You can look at the code until your eyes bleed, but actually visualizing the variable being incremented [via the Serial.print() function], to see its values every time through the loop() can help explain what is happening very quickly.

A Brief Overview of the Serial Library

We can’t talk about the Serial.print() function, without briefly talking about the Serial library.

Generally speaking, a library is simply a collection of functions that all have something in common.

The print() function is part of a library called the Serial library. Now, it's not cereal like Cheerios or Captain Crunch we're talking about - it's serial as in “one after another”.

The serial library allows us to interface the Arduino with other hardware, like a computer.

In order for us to use the functions of the Serial library, we have to initiate serial communication - to do this we use the Serial.begin() function. Serial.begin() needs to go in the setup().

void setup() { //Initiate Serial communication. Serial.begin(9600); }

Now for reasons beyond the scope of this discussion, it is convenient to use the number 9600 in the Serial.begin() function. The value 9600 specifies the baud rate. The baud rate is the rate at which information will pass from the Arduino to the computer, or in the other direction.

The Basic Use of the Serial.print() Function

Let's talk about how to use the Serial.print() function.

Say we have a sketch. This sketch has a variable called coolFactor.

I want to be able to monitor the value of the coolFactor variable – that is, I want it displayed on my computer screen. A perfect use for the Serial.print() function!

The first thing we must do in the Arduino sketch is begin serial communications. Like we just said, we use the Serial.begin() function and place it within the setup() of the sketch.

//A variable to hold the level of coolness int coolFactor = 3; void setup() { Serial.begin(9600); } void loop() { //Send the value of coolFactor to the the Serial port. //So we can see it in the serial monitor window Serial.print(coolFactor); }

Now in the loop(), if I want to display coolFactor’s value with print(), I simply type Serial.print() and in the parenthesis I type the variable name.

If we upload this sketch to the Arduino, the value of coolFactor will be sent to the serial port every time through the loop(). In the Arduino IDE, if you open up the serial monitor window [Tools > Serial Monitor], you will see the values streaming down.

In next week’s episode, we’ll talk about some more intricacies of the Serial.print() function.

If you enjoyed this lesson, I welcome you to join 1000's of students who have enjoyed our free Arduino Crash Course - it's a 19 part video training series on using Arduino (You can sign up below).

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#Tech #Higher Education #Programming Electronics Academy #Podcasting Education

Learn Programming and Electronics with Arduino

Use Serial.print() to Display Arduino output on your computer monitor: Part 1

Learn Programming and Electronics with Arduino

published לפני 8 שנים

שתפו

MP4•בית הפרקים

In this week’s episode, we will talk about the intricacies of the Serial.print() function.

This is the first part, of a two part series on the Serial.print() function. Here are the specific topics we will cover in this lesson:

Why would you want to use the Serial.print() function?
A brief overview of the Serial library
The basic use of the Serial.print() function

Like this video? Sign up for our FREE Arduino Crash Course to get more videos that don't assume you have a PhD.

Why Would You Want to Use the Serial.print() Function?

There are an endless number of reasons you may want to send information from the Arduino to a computer display, but two reasons really stand out to me:

The first reason is being able to see information that you are generating with your Arduino.

The other big reason to send information to a computer display using the Serial.print() function is for developing and debugging Arduino sketches.

A Brief Overview of the Serial Library

We can’t talk about the Serial.print() function, without briefly talking about the Serial library.

Generally speaking, a library is simply a collection of functions that all have something in common.

The print() function is part of a library called the Serial library. Now, it's not cereal like Cheerios or Captain Crunch we're talking about - it's serial as in “one after another”.

The serial library allows us to interface the Arduino with other hardware, like a computer.

In order for us to use the functions of the Serial library, we have to initiate serial communication - to do this we use the Serial.begin() function. Serial.begin() needs to go in the setup().

void setup() { //Initiate Serial communication. Serial.begin(9600); }

The Basic Use of the Serial.print() Function

Let's talk about how to use the Serial.print() function.

Say we have a sketch. This sketch has a variable called coolFactor.

I want to be able to monitor the value of the coolFactor variable – that is, I want it displayed on my computer screen. A perfect use for the Serial.print() function!

The first thing we must do in the Arduino sketch is begin serial communications. Like we just said, we use the Serial.begin() function and place it within the setup() of the sketch.

Now in the loop(), if I want to display coolFactor’s value with print(), I simply type Serial.print() and in the parenthesis I type the variable name.

In next week’s episode, we’ll talk about some more intricacies of the Serial.print() function.

If you enjoyed this lesson, I welcome you to join 1000's of students who have enjoyed our free Arduino Crash Course - it's a 19 part video training series on using Arduino (You can sign up below).

61 פרקים

#Tech #Higher Education #Programming Electronics Academy #Podcasting Education

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Learn Programming and Electronics with Arduino

לפני 8 years8:11

8:11

Learn Programming and Electronics with Arduino

1
What to do when you just don't know :: Arduino, ADXL345 triple axis accelerometer and an RGB LED 14:04

לפני 8 years14:04

14:04

This lesson discusses what to do when you open an existing program and realize that you simply don't understand all the stuff that is going on. It also talks about using the ADXL345 triple axis accelerometer breakout board to control the hue of a Red-Green-Blue (RGB) LED.

Learn Programming and Electronics with Arduino

1
3 Ways to Use Acceleration in an Arduino Sketch 17:37

לפני 8 years17:37

17:37

This lesson covers three easy ways to implement some form of acceleration in your Arduino sketches. It will cover the following: Linear Acceleration Exponential Acceleration Messing Around with the Square Root function What is Acceleration? Acceleration is the rate of change of something over time. Acceleration would help describe things like: Have fast can a stopped car get to 88mph? If I do a wing-suit jump from the top of Mount Everest, how fast will I be when I am gliding over base camp? How can I gently slow down the movement of a mechanical servo before it comes to rest? We can implement acceleration when programming Arduino quite easily with just a couple lines of code. The basic concept is that a variable will need to change - how it changes over the course of the sketch is what we are interested in. Below are three examples of how we can code change in variables so they display acceleration. Linear acceleration Linear acceleration is a constant rate of change. It can be represented by a sloped line on an x-y axis. A simple way to use it is to increment or decrement a variable every time through a loop like below... for (int i = 0; i < 10; i++) { //accel gets increasingly smaller as for loop continues accel = accel - 100; }//close for You can see in the code above, that each time through the 'for loop', the accel variable is decreasing by 100. If accel started at 1000, this is what accel would look like with respect to the number of iterations of the for loop. You can see that the accel variable decreases at a set rate over time in a linear fashion. Exponential Acceleration Exponential acceleration changes over time too, but it does so more dramatically (It's basically a drama queen). At first the rate of change in the variable is small, but once it begins to increase it really takes off! You can use the power function built into the Arduino IDE to make a variable change exponentially. The power function syntax is quite easy. pow( base, exponent ) The parameter base is the number that get raised to the power of the exponent . Like 2 to the 5th power. Below is an example of how you might code it to change a variable exponentially over the course of a 'for loop'. for (int i = 0; i < 10; i++) { //accel grows exponentially as the for loop continues accel = pow(2, i); }//close for Looking at a chart of accel over the course of the 'for loop', we can see that the way it changes is much different than linear acceleration: The theme for exponential growth is that is starts out slow, but once it starts going it really get's going! Using the Square Root Function for Acceleration The square root function can also provide some flavor to the output from your Arduino. It's syntax is simple: sqrt( x ) It returns the square root of the number or variable that you put in the parenthesis. Below is an easy way to use it in a 'for loop': for (int i = 0; i < 6; i++) { //accel quickly decreases through the loop accel = sqrt(accel); }//close for Let's look at how accel changes over the course of the for loop(let's say it started at 10,000): You can see the a rapid deceleration in the value of the accel variable of the 'for loop'. Practice With Acceleration: If you want to take a look at what these types of acceleration will do in "real" life, then set up the circuit below. You Will Need: (10) LEDs (10) 220 Ohm Resistors (1) Jumper Wire Arduino Board Bread Board Black Marker Set Up The Circuit: Start by by placing one resistor at pin 2 on your Arduino. Connect the other end of the resistor to the breadboard and then connect the long leg of the LED to the resistor. Place the short leg of the LED in the outer ground rail of the bread board. Then add 9 more resistors and LEDs across - you should stop at Pin 11 on the Arduino. Then add a jumper wire from GND on the Arduino to the shared ground on the breadboard. (All LEDs not pictured). That is pretty much it for the circuit. Below are the code examples for the different ways to program acceleration that we talked about: Here is the code for the linear acceleration: /* Linaer ( Constant ) Acceleration The circuit: * LEDs from pins 2 through 11 to ground created 2006 by David A. Mellis modified 30 Aug 2011 by Tom Igoe Modifeid 21 Jul 2014 by Michael James This example code is in the public domain. http://www.arduino.cc/en/Tutorial/Array */ //Declare and initialize variables // The higher the number, the slower the timing. int timer = 1000; // an array of pin numbers to which LEDs are attached int ledPins[] = { 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; // the number of pins (i.e. the length of the array) int pinCount = 10; void setup() { // the array elements are numbered from 0 to (pinCount - 1). // use a for loop to initialize each pin as an output: for (int thisPin = 0; thisPin < pinCount; thisPin++) { pinMode(ledPins[thisPin], OUTPUT); } //Start Serial Communication Serial.begin(9600); }//close setup void loop() { // loop from the lowest pin to the highest: for (int thisPin = 0; thisPin < pinCount; thisPin++) { // turn the pin on: digitalWrite(ledPins[thisPin], HIGH); delay(timer); // turn the pin off: digitalWrite(ledPins[thisPin], LOW); //decrement timer (EASY WAY) timer = timer - 100; //let's take a look at the numbers via the serial monitor window (Tools > Serial Monitor) Serial.print("Back ... LED #"); Serial.print(thisPin); Serial.print(" = "); Serial.println(timer); }//close for //reset timer for next for loop timer = 1000; // loop from the highest pin to the lowest: for (int thisPin = pinCount - 1; thisPin >= 0; thisPin--) { // turn the pin on: digitalWrite(ledPins[thisPin], HIGH); delay(timer); // turn the pin off: digitalWrite(ledPins[thisPin], LOW); //decrement timer timer = timer - 100; //let's take a look at the numbers via the serial monitor window (Tools > Serial Monitor) Serial.print("Forth ... LED #"); Serial.print(thisPin); Serial.print(" = "); Serial.println(timer); }//close for //reset timer for next for loop timer = 1000; }//close loop Here is the code for the exponential acceleration: /* Exponential Acceleration The circuit: * LEDs from pins 2 through 11 to ground created 2006 by David A. Mellis modified 30 Aug 2011 by Tom Igoe Modifeid 21 Jul 2014 by Michael James This example code is in the public domain. http://www.arduino.cc/en/Tutorial/Array */ //Declare and initialize variables // The higher the number, the slower the timing. float timer = 1000; // an array of pin numbers to which LEDs are attached int ledPins[] = { 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; // the number of pins (i.e. the length of the array) int pinCount = 10; void setup() { // the array elements are numbered from 0 to (pinCount - 1). // use a for loop to initialize each pin as an output: for (int thisPin = 0; thisPin < pinCount; thisPin++) { pinMode(ledPins[thisPin], OUTPUT); } //Start Serial Communication Serial.begin(9600); }//close setup void loop() { // loop from the lowest pin to the highest: for (int thisPin = 0; thisPin < pinCount; thisPin++) { // turn the pin on: digitalWrite(ledPins[thisPin], HIGH); delay(timer); // turn the pin off: digitalWrite(ledPins[thisPin], LOW); //decrement timer timer = pow(2, thisPin); //let's take a look at the numbers via the serial monitor window (Tools > Serial Monitor) Serial.print("Back ... LED #"); Serial.print(thisPin); Serial.print(" = "); Serial.println(timer); }//close for //reset timer for next for loop // loop from the highest pin to the lowest: for (int thisPin = pinCount - 1; thisPin >= 0; thisPin--) { // turn the pin on: digitalWrite(ledPins[thisPin], HIGH); delay(timer); // turn the pin off: digitalWrite(ledPins[thisPin], LOW); //decrement timer timer = pow(2, thisPin); //let's take a look at the numbers via the serial monitor window (Tools > Serial Monitor) Serial.print("Forth ... LED #"); Serial.print(thisPin); Serial.print(" = "); Serial.println(timer); }//close for //reset timer for next for loop timer = 1000; }//close loop Here is the code for messing around with the square root: /* square root The circuit: * LEDs from pins 2 through 11 to ground created 2006 by David A. Mellis modified 30 Aug 2011 by Tom Igoe Modifeid 21 Jul 2014 by Michael James This example code is in the public domain. http://www.arduino.cc/en/Tutorial/Array */ //Declare and initialize variables // The higher the number, the slower the timing. float timer = 1000; // an array of pin numbers to which LEDs are attached int ledPins[] = { 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; // the number of pins (i.e. the length of the array) int pinCount = 10; void setup() { // the array elements are numbered from 0 to (pinCount - 1). // use a for loop to initialize each pin as an output: for (int thisPin = 0; thisPin < pinCount; thisPin++) { pinMode(ledPins[thisPin], OUTPUT); } //Start Serial Communication Serial.begin(9600); }//close setup void loop() { // loop from the lowest pin to the highest: for (int thisPin = 0; thisPin < pinCount; thisPin++) { // turn the pin on: digitalWrite(ledPins[thisPin], HIGH); delay(timer); // turn the pin off: digitalWrite(ledPins[thisPin], LOW); //decrement timer timer = sqrt(timer); //let's take a look at the numbers via the serial monitor window (Tools > Serial Monitor) Serial.print("Back ... LED #"); Serial.print(thisPin); Serial.print(" = "); Serial.println(timer); }//close for //reset timer for next for loop timer = 1000; // loop from the highest pin to the lowest: for (int thisPin = pinCount - 1; thisPin >= 0; thisPin--) { // turn the pin on: digitalWrite(ledPins[thisPin], HIGH); delay(timer); // turn the pin off: digitalWrite(ledPins[thisPin], LOW); //decrement timer timer = sqrt(timer); //let's take a look at the numbers via the serial monitor window (Tools > Serial Monitor) Serial.print("Forth ... LED #"); Serial.print(thisPin); Serial.print(" = "); Serial.println(timer); }//close for //reset timer for next for loop timer = 1000; }//close loop I hope the lesson was helpful. The idea of adding acceleration to a sketch can seem a bit intimidating at first, but as you can see, it turns out to be a rather simple addition of code. Try on Your Own Challenge: Can you make the fade amount of an LED accelerate/deccelerate? Can you add a potentiometer to the circuit above and find a way to control the amount of acceleration - either linear, exponential or otherwise.…

Learn Programming and Electronics with Arduino

לפני 8 years5:45

5:45

Learn Programming and Electronics with Arduino

1
What can you do with Arduino? Let's get pumped! 3:12

לפני 8 years3:12

3:12

I want to get you excited about the possibilities when you learn some basic programming and electronics that drive the Arduino. It is literally amazing what you can do.

Learn Programming and Electronics with Arduino

1
Prelude to the Arduino Crash Course 1:14

לפני 8 years1:14

1:14

The premise of our course is that Arduino is a tool to assist in prototyping your imagination.

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