lcd displays random characters quotation

I have made a successful tachometer measuring an erector set motor’s speed (rpm) using an ir led and ir detector diode. The original program is set to display the data i.e. rpm via the serial monitor. I have been trying for hours to alter the code to also display on a 16x2 lcd display instead or better yet both. All I get is the “LCD Ready…” displayed from the setup sequence then random jumbled numbers as the measurements. These random characters change as the speed changes. Serial Monitor still displays the correct information. Can data not be displayed on both simultaneously? I know its something simple. Serial.println(rpm,DEC); print to the serial monitor and lcd.print(rpm,DEC); should print the exact data to the lcd Correct? (with a delay then clear lcd and repeat). I have used an lcd to display text in quotations like lcd.print(“You’re a Loony”); but never variable changing data. Here is the edited tachometer Code I have so far:

So I"ve been working on an arduino project for an escape room puzzle. It"s essentially a bomb with a timer on an lcd screen. After all of the elements of the bomb are solved the timer stops and the lcd screen displays that the bomb has been defused and gives the group a clue to the next puzzle. 9 times out of 10 it works perfectly. But every once in a while when it is supposed to display that the bomb is defused the lcd screen just shows random broken characters. I haven"t had any luck diagnosing the problem. Hoping somebody here might have an idea.

My LCD is showing random characters, see the picture below (the last character blinks, some characters change and over time there are slowly more and more characters). I"m starting to wonder if the LCD I chose has a driver compatible with the LiquidCrystal library, what do you think? If so what can I do to avoid buying another one?

I have connected the LCD by the 3 wire method using the LiquidCrystal595 library+74HC595 register shift; sometimes "hello world" is displayed but other times the LCD displays weird characters.

I have attached a 4 line LCD display to Atmega8 and trying to get ADC reading on it through a POT. Everything works fine except that sometimes it just stops working and prints out strange characters (special characters only, no alphabet or numbers).

So if you can come to the readable text is for sure not the display issue, but the memory where the characters are stored unless some cabling would be losen or faulty by years of printer jerks.

I understand it happens immediately after printer switch on or restart. Does the printer react on knob push? When you come to readable print from SD, after turning the knob back the text print from SD reappears same readable? I am trying to eliminate random behaviour.

In this project, we’ll build a random quote generator that displays a random quote to the user every time they press a button. To get started, you’ll need three essential things that are almost always used for every web project:a web browser

Since we know that we will have multiple quotes, and each one will be picked out randomly, the best choice would be to store multiple strings within an array.

In order to retrieve a random quote from an array, we now know that we need to produce a random number every time the user clicks on the button. Then, we would use that random number to retrieve a quote from the array and place that quote onto the HTML document, which in turn, would display the quote on the browser to the user.

That’s it! We solved how to create a Random Quote Generator by logically thinking in code! Here’s a summary of the logic that we’ve come up with for our project:Quotes are multiple strings that need to be stored in an array.

I Googled “Best Quotes” and copied the first 10 from a website, thenplaced them in an array separated by commas. Make sure you place your quotes in single or double quotation marks. If your quote consists of apostrophes, single or double quotes, you may need to use backslashes to escape these characters so that JavaScript will know that the symbols are part of the string, and not the coding syntax.

Now we need to create our newQuote() function that I mentioned earlier in the HTML section of this tutorial. For our newQuote() function, we need to generate a random whole number that ranges from 0 to the length of our quotes array. I will explain further below.

Second, we will pass in Math.random() as a parameter into Math.floor(). The Math.random() function will generate a random decimal number between 0 and 1.

If we console log our randomNumber at this state, it will always return 0. This is because Math.random() will always be a decimal between 0 and 1 such as 0.4, 0.721, 0.98, and so on. Because we pass Math.random() into Math.floor() as a parameter, Math.floor() is always rounding down to the nearest decimal, therefore, every decimal between 0 and 1 will always revert back to 0.

So what’s the point of doing this? Well, to create our array index numbers, we need whole numbers, but we need random whole numbers. To generate random whole numbers and break away from only returning 0, we will need to take our random decimal and multiply it by a whole number.

If we console log randomNumber, the results will be anywhere between 1 and 19. Now I could use this current state of randomNumber to pull out a quote from the quotes array, but it will only work if the array index number exist within the array, otherwise, an error will be thrown.

If you’ve reached this part of the tutorial, you’ve completed the project! Congratulations! You are practically done building the Random Quote Generator.

Press the button, and it should display a random quote to your screen. Press the button as many times as you like. Each time, a new quote should replace current one on screen.

You’re probably thinking that this Random Quote Generator looks very boring, and no one would probably use it. And you’re absolutely right. This project looks quite plain, and it’s up to you to change that.

If you’re curious to see how much a project can change with CSS and a few more lines of JavaScript code, check out my own version of this Random Quote Generator that I titled “Epiphany Clock”here.

In this project, we’ll build a random quote generator that displays a random quote to the user every time they press a button. To get started, you’ll need three essential things that are almost always used for every web project:a web browser

Since we know that we will have multiple quotes, and each one will be picked out randomly, the best choice would be to store multiple strings within an array.

In order to retrieve a random quote from an array, we now know that we need to produce a random number every time the user clicks on the button. Then, we would use that random number to retrieve a quote from the array and place that quote onto the HTML document, which in turn, would display the quote on the browser to the user.

That’s it! We solved how to create a Random Quote Generator by logically thinking in code! Here’s a summary of the logic that we’ve come up with for our project:Quotes are multiple strings that need to be stored in an array.

I Googled “Best Quotes” and copied the first 10 from a website, thenplaced them in an array separated by commas. Make sure you place your quotes in single or double quotation marks. If your quote consists of apostrophes, single or double quotes, you may need to use backslashes to escape these characters so that JavaScript will know that the symbols are part of the string, and not the coding syntax.

Now we need to create our newQuote() function that I mentioned earlier in the HTML section of this tutorial. For our newQuote() function, we need to generate a random whole number that ranges from 0 to the length of our quotes array. I will explain further below.

Second, we will pass in Math.random() as a parameter into Math.floor(). The Math.random() function will generate a random decimal number between 0 and 1.

If we console log our randomNumber at this state, it will always return 0. This is because Math.random() will always be a decimal between 0 and 1 such as 0.4, 0.721, 0.98, and so on. Because we pass Math.random() into Math.floor() as a parameter, Math.floor() is always rounding down to the nearest decimal, therefore, every decimal between 0 and 1 will always revert back to 0.

So what’s the point of doing this? Well, to create our array index numbers, we need whole numbers, but we need random whole numbers. To generate random whole numbers and break away from only returning 0, we will need to take our random decimal and multiply it by a whole number.

If we console log randomNumber, the results will be anywhere between 1 and 19. Now I could use this current state of randomNumber to pull out a quote from the quotes array, but it will only work if the array index number exist within the array, otherwise, an error will be thrown.

If you’ve reached this part of the tutorial, you’ve completed the project! Congratulations! You are practically done building the Random Quote Generator.

Press the button, and it should display a random quote to your screen. Press the button as many times as you like. Each time, a new quote should replace current one on screen.

You’re probably thinking that this Random Quote Generator looks very boring, and no one would probably use it. And you’re absolutely right. This project looks quite plain, and it’s up to you to change that.

If you’re curious to see how much a project can change with CSS and a few more lines of JavaScript code, check out my own version of this Random Quote Generator that I titled “Epiphany Clock”here.

Characters variable values can be equal to almost any single letter, number or punctuation mark you can type with your keyboard and some special characters that you probably can’t even make using your keyboard! Here’s what we’ll be covering on this page:

ASCII Values ASCII stands for American Standard Code for Information Interchange. Inside of Sparki’s little robotic brain all the characters get converted to the ASCII value when Sparki is doing any calculations or actions with a character. That explains why you can get the value ‘a’ by creating a character variable with the value ‘a’ or 97. Check out the chart below to get comfortable with characters before we move on.

Assigning Values (Putting Information in the Character Variables) There are two different ways you can assign values to a character variable. One way uses the letters, numbers and punctuation marks that you will see on Sparki’s LCD screen, other uses the ASII values that you can find in the chart above. Here’s how you assign a value to a character variable using the first method. Notice how the ‘a’ is wrapped in single-quotes.That’s important. Double quotes do not mean a single character, they indicate a sentence or word. I’m sure you’re also familiar with the semicolon by now, it’s our ever present friend that tells Sparki the line of code is finished and ready for action.

Displaying the Character Variables So now that you know how to create character variables and assign them values let’s learn how to use them with Sparki! You’ll learn later how to use characters during communication but for now we’re going to make them show up on the LCD screen. This is useful for sending messages, displaying data or just having fun. However, before we can display the characters on screen we’ll need to write a couple commands to make the LCD screen work.

} Let’s go over these three commands quickly so that you feel comfortable with all the code we are using.The sparki.clearLCD( ) command tells Sparki to clear the LCD. If we didn’t use this command then the characters that were drawn on the screen before would stay there and as more and more characters got drawn on the screen it would become harder and harder to see the new characters since they would be muddled together with all the other previous characters.

The sparki.updateLCD( ) tells Sparki to put whatever code that was printed to the LCD on the screen. This is the line of code that actually makes the characters visible. Any print commands that we use to try and display characters after this command will never show up on the LCD.

delay(1000) tells Sparki to wait 1000 milliseconds (or one second) before continuing with the code. The reason this line of code is in our program is because if we were displaying different data each time through loop then the characters displayed on Sparki’s LCD would go by so quickly we wouldn’t even be able to see them! These are just the basics needed to get started with the LCD. If you want more information about the LCD screen click here. Now that you feel comfortable with the basic LCD commands let’s display some characters. We’ll be using the sparki.println( ) command to display our characters. This command simply prints whatever is inside its parentheses to the LCD screen and then goes to the next line on the LCD in case there will be more sparki.println( ) commands. Let’s use some code to scroll through all the possible character values and display their ASCII values as well-

Doing Math with Character Variables Because characters are integer numbers on the inside, you can add to them (or subtract, multiply or divide) to change them. Try it out:

Next Step: But characters don’t sound very useful on their own. To spell things, we need to have more than one of them in a row and there must be an easier way using a whole bunch of sparki.print( ) commands. How do we do that? With Arrays!

A String, at its core, is really just a fancy way of storing an array of characters. If we didn"t have the String class, we"d probably have to write some code like this:char[] sometext = {"H", "e", "l", "l", "o", " ", "W", "o", "r", "l", "d"};

Clearly, this would be a royal pain in the Processing behind. It"s much simpler to do the following and make a String object:String sometext = "How do I make String? Type some characters between quotation marks!";

It appears from the above that a String is nothing more than a list of characters in between quotes. Nevertheless, this is only the data of a String. We must remember that a String is an object with methods (which you can find on the reference page.) This is just like how we learned in the Pixels tutorial that a PImage stores both the data associated with an image as well as functionality: copy(), loadPixels(), etc.

Another useful method is length(). This is easy to confuse with the length property of an array. However, when we ask for the length of a String object, we must use the parentheses since we are calling a function called length() rather than accessing a property called length.String message = "This String is 34 characters long.";

However, technically speaking, when == is used with objects, it compares the memory addresses for each object. Even though they contain the same data—hello— if they are different object instances == could result in a false comparison. The equals() function ensures that we are checking to see if two String objects contain the exact same sequence of characters, regardless of where that data is stored in the computer"s memory.String one = "hello";

Here"s the full example that displays a different headline each time the previous headline leaves the screen. The headlines are stored in a String array.// An array of news headlines

Calling the text() function for each character will allow us more flexibility (for coloring, sizing, and placing characters within one String individually). The above code has a pretty major flaw, however—the x location is increased by 10 pixels for each character. Although this is approximately correct, because each character is not exactly ten pixels wide, the spacing is off.

The proper spacing can be achieved using the textWidth() function as demonstrated in the code below. Note how this example achieves the proper spacing even with each character being a random size!

This “letter by letter” methodology can also be applied to a sketch where characters from a String move independently of one another. The following example uses object-oriented design to make each character from the original String a Letter object, allowing it to both be a displayed in its proper location as well as move about the screen individually.PFont f;

What we need to do is replace each box with a character from a String that fits inside the box. And since characters all do not have the same width, instead of using a variable w that stays constant, each box will have a variable width along the curve according to the textWidth() function.

Leet is a type of symbolic spelling in which letters are replaced by lookalike numbers, punctuation, other symbols, and even characters from other languages. For example, "hello" written as "|-|3110".

ASCII characters for graphics, dungeons (random and infinite), and monsters, but also many (optional) storylines that help hold all the features together to stop it from becoming boring.

These characters are not part of the standard 26-character Latin alphabet, but are used in the Swedish alphabet (many Scandinavian languages use such extended versions of the Latin alphabet).

This is the first splash that doesn"t end with an exclamation point (!), other than the special "missingno" splash. As its text implies, the splash is never displayed in Java Edition (but displays in other editions).

(Obfuscated) This splash is stored as "§kFUNKY LOL" in splashes.txt; as with the "Colormatic" splash, the "§k" is a formatting code, but instead of changing the color of the following text, the code obfuscates the text, replacing it with random, rapidly-changing characters.

A reference to the video "Random Changes and Bad Game Design" by the YouTuber _MethodZz_, where he repeatedly uses this phrase while demonstrating several bugs in Java Edition 1.14.