Counter 0-9 with 7 segments display and Arduino Uno.jpg

In this example I propose a simple simulation with Tinkercad of a circuit that creates a counter from 0 to 9 with a 7-segment display, programmed using Arduino Uno. The display is of the common cathode type.

The sketch that I propose to you is really working. This is the link: https://www.tinkercad.com/things/6ok3zL0QW2L. It is based on a look-up table made with an array where I have coded the digits of the numbers to be shown on the display.
I used port registers based programming and I choosed the ATMega 328 pin group called port D which is 8 bit and is convenient for managing an LED display. Here you can find information about Arduino port registers: https://www.arduino.cc/en/Reference/PortManipulation.

It is important that when you load the sketch in the Arduino FLASH memory, you momentarily disconnect pins 0 and 1, because they are used by the USB as serial TX and RX, otherwise the loading fails.

This is the sketch:

byte numero [10]={B00111111, B00000110, B01011011, B01001111, B01100110, B01101101, B01111101, B00000111, B01111111, B01101111};

int i=0;

void setup()
{
   DDRD = B11111111;
}

void loop()
{
   PORTD = numero[i];
   delay(500);
   i++;
   if (i>9)
      i=0;
}

Hits: 8341

My simple Javascript exercises colection starts from page: Some simple Javascript exercises. In this article I propose more.

Exercise 4
Solve a second order equation

<!DOCTYPE html>
<html><head>
<script>
function equation2degree() {
  var a = document.getElementById("number1").value;
  a=parseFloat(a);
  var b = document.getElementById("number2").value;
  b=parseFloat(b);
  var c = document.getElementById("number3").value;
  c=parseFloat(c);
  var delta = b*b-(4*a*c);
  if (delta < 0)
  {
     document.getElementById("solution").innerHTML = "Impossible";
  }
  else
  {
     var x1=(-b+Math.sqrt(delta))/(2*a);
     var x2=(-b-Math.sqrt(delta))/(2*a);         
     document.getElementById("solution").innerHTML = "x<sub>1</sub>=" + x1 + "&nbsp;&nbsp;x<sub>2</sub>=" + x2;
  }
}
</script>
</head><body>
  <h3>Solve a second order equation in the form ax<sup>2</sup>+bx+c=0</h3>
  <p>Insert the coefficients (integer or real numbers, with negative sign if present)<BR><BR>
  a: <input type="text" id="number1"><BR><BR>
  b: <input type="text" id="number2"><BR><BR>
  c: <input type="text" id="number3"><BR><BR>
  <button onclick="equation2degree()">Solve!</button></p>
  <p>Solution:&nbsp;&nbsp;<span id="solution"></span></p>
</body></html>


Exercise 5
Determine if a year is a leap year.
All years whose number represents them is a multiple of 4, are leap years, except for secular years (ie multiples of 100) if their number is not a multiple of 400.

<!DOCTYPE html>
<html><head>
<script>
function leapYear() {
  var year = parseInt(document.getElementById("year").value);
  var leap = false;
  if (year%100==0)   // is it a secular year?
  {
    if (year%400==0)
    {
      leap = true;
    }
  }
  else   // all other years!
  {
    if (year%4==0)
    {
      leap = true;
    }
  }
  document.getElementById("print").innerHTML = leap;
}
</script>
</head><body>
  <h3>Tell me a year and I determine if it is a leap year!</h3>
  Gimme the year: <input type="number" id="year">
  <button onclick="leapYear()">Submit</button>
  <BR><p>Answer: <span  id="print"></span></p><BR>
</body></html>

 

Hits: 3496

Any layout for the web makes extensive use of external javascript files to ensure particular features or effects to the site. The use of this scripting technology is practically indispensable for contemporary web development.
A very good reference for teach Javascript is https://www.w3schools.com/js/default.asp. In addition I propose some simple exercises to my class to become familiar with JavaScript programming. Javascript is easy to learn. It can modify HTML content. To test the following programs in Javascript, select, copy and paste each of the following codes into an HTML file, created by you with any text software. Then save the file and open it in your web browser. Alternatively you can paste each codes into a textarea of ​​the W3Schools site like this: https://www.w3schools.com/js/tryit.asp?filename=tryjs_myfirst
One of the many HTML JavaScript methods is getElementById(). In the examples on this page, I use the getElementById() method to find an HTML element, with a specified ID, to acquire its value (value) or to modify the content of the element (innerHTML). For details, see: https://www.w3schools.com/js/js_intro.asp.

Exercise 1
A demonstration of how to access a input text field I/O in Javascript

<!DOCTYPE html>
<html><head>
<script>
function myFunction() {
  var x = document.getElementById("input").value;
  document.getElementById("output").innerHTML = x;
}
</script>
</head><body>
<h3>A demonstration of how to access a input text field I/O in Javascript</h3>
<input type="text" id="input" value="Write here what you want...." size="30">
<p>Click the button to get the input of the text field.</p>
<button onclick="myFunction()">Try it!</button>
<p id="output"></p>
</body></html>

 

Exercise 2
Calculate the sum of two integers

<!DOCTYPE html>
<html><head>
<script>
function myFunction() {
  var x = document.getElementById("number1").value;
  x=parseInt(x);
  var y = document.getElementById("number2").value;
  y=parseInt(y);
  var z=x+y;
  document.getElementById("output").innerHTML = z;
}
</script>
</head><body>
<h3>This script calculates the sum of two integers</h3>
First number:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<input type="number" id="number1"><BR><BR>
Second Number: <input type="number" id="number2">
<p>Click the button to get the sum of the input in tne input below.</p>
<button onclick="myFunction()">Try Add!</button>
<p>Sum: <span id="output"></span></p>
</body></html>

 

Exercise 3
Determine the greater of two numbers

<!DOCTYPE html>
<html><head>
<script>
function max() {
  var x = document.getElementById("number1").value;
  x=parseInt(x);
  var y = document.getElementById("number2").value;
  y=parseInt(y);
  if (x>y)
     document.getElementById("print").innerHTML = x;
  else
     document.getElementById("print").innerHTML = y;
}
</script>
</head><body>
<h3> Determine the greater of two numbers in Javascript</h3>
First number:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<input type="number" id="number1"><BR><BR>
Second Number: <input type="number" id="number2">
<BR><BR><button onclick="max()">Click the button to get the greater!</button>
<p>The greater is: <span id="print"></span></p><BR>    
</body></html>

The exercises continue to the page Other simple Javascript exercises.

Hits: 4821

Let's learn how to develop a simple timer in LabVIEW NXG. The image shows the labVIEW Panel with

  • three Numeric Controls to set hours, minutes and seconds,
  • a Power Button to start the contdown,
  • a Numeric Indicator to display the remaining seconds to count,
  • a Round LED that lights up at the end of the countdown. 

The VI is simple, so we can see in the Diagram below. It requires principally:

  • a While Loop that repeats the code on its subdiagram until a specific condition occurs: a While Loop always executes at least one time and behaves similarly to a do while loop in other programming languages (for example C),
  • an Elapsed Time VI that indicates the amount of time that has elapsed since the target time we specify.

20190115 Timer NXG1.0

Hits: 10391

The diode can be considered as a particular case of non-linear resistor. Although the device category of nonlinear circuits is very wide and requires generally methods of investigation of considerable complexity, the most important diode circuits in electrical and electronic applications do not always require excessive conceptual complications for their understanding. There are different categories of diodes, among these the most significant are:

  • rectifiers diodes;
  • zener diodes;
  • diodes LED;
  • photodiodes;
  • varactor diodes;
  • Schottky diodes.

Now I propose you a test on PN, LED and zener diodes: https://forms.gle/BgKaft8GDvSE93Ts8 Try it!

Hits: 3630

Advertising

Advertising

Advertising

We use cookies

We use cookies on our website. Some of them are essential for the operation of the site, while others help us to improve this site and the user experience (tracking cookies). You can decide for yourself whether you want to allow cookies or not. Please note that if you reject them, you may not be able to use all the functionalities of the site.

Ok Decline