![]() ![]() ![]() Press Shift in combination with another key to type the symbol shown on the upper part of that key. Press Shift in combination with a letter to type an uppercase letter. In addition to letters, numerals, punctuation marks, and symbols, the typing keys also include Shift, Caps Lock, Tab, Enter, the Spacebar, and Backspace. You can move the cursor by clicking in the desired location with the mouse, or by using the navigation keys (see the "Using navigation keys" section of this article). It shows where the text that you type will begin. Whenever you need to type something in a program, e‑mail message, or text box, you'll see a blinking vertical line ( ) called the cursor or insertion point. The following illustration shows how these keys are arranged on a typical keyboard. The keys are grouped together in a block like a conventional calculator or adding machine. The numeric keypad is handy for entering numbers quickly. They include the arrow keys, Home, End, Page Up, Page Down, Delete, and Insert. These keys are used for moving around in documents or webpages and editing text. The functionality of these keys differs from program to program. They are labeled as F1, F2, F3, and so on, up to F12. The function keys are used to perform specific tasks. The most frequently used control keys are Ctrl, Alt, the Windows logo key, and Esc.įunction keys. These keys are used alone or in combination with other keys to perform certain actions. These keys include the same letter, number, punctuation, and symbol keys found on a traditional typewriter.Ĭontrol keys. The keys on your keyboard can be divided into several groups based on function: But did you know you can also use your keyboard to control your computer? Learning a few simple keyboard commands(instructions to your computer) can help you work more efficiently. Whether you're writing a letter or calculating numerical data, your keyboard is the main way to enter information into your computer. To install it, download the ZIP file below, then go to Sketch > Include Library > Add. This library is nice because it includes most of the functions available in the standard LiquidCrystal library. To use an I2C enabled LCD on the Arduino, you’ll need to install the LiquidCrystal I2C library by Marco Schwartz. That takes up a lot of pins, so I’m going to use an I2C enabled LCD because it only needs 4 wires to connect to the Arduino. 4X4 keypads use 8 pins and 3X4 keypads use 7 pins. Now let’s see how to print the key presses on an LCD. When you press a key, the value will be printed out: You would just change it to this:Īfter you upload the code, open the serial monitor. For example, say your keypad has a column of letters on the left instead of the right. If your keypad has a different layout, you can define which characters are printed when you press a button. The characters are laid out just as they appear on the keypad. Lines 6-11 define which characters are printed when a particular button is pressed on the keypad. Once the Keypad library is installed, you can upload this code to the Arduino if you’re using a 4X4 keypad: Click on the library, then click install. To install the Keypad library, go to Sketch > Include Library > Manage Libraries and search for “keypad”. This library takes care of setting up the pins and polling the different columns and rows. We’ll use the Keypad library by Mark Stanley and Alexander Brevig. Programming the Keypadįor a basic demonstration of how to setup the keypad, I’ll show you how to print each key press to the serial monitor. Repeat this process for each one of the other columns until you have each one mapped out. Now press down another button in the same row, and insert the positive wire into each one of the other pins. The pin that makes the LED light up is the pin that’s connected to that button’s column. Now insert the positive wire into each one of the remaining pins. Now press and hold any one of the buttons in that row. To figure out which pins the columns are connected to, insert the ground wire into the pin you know is row 1. Now move the ground wire over to the next pin, press a button in a different row, and repeat the process above until you’ve found the pin for each row. If the LED lights up on a different pin, it means the ground wire is inserted into the row 1 pin. If none of the buttons in row 1 make the LED light up, the ground wire is not connected to row 1. If the LED lights up at one of the pins, press and hold another button in row 1, then insert the positive wire into each one of the other pins again. Now insert the positive (red) wire into each one of the other pins. Press any button in row 1 and hold it down. ![]() Insert the ground (black) wire into the first pin on the left. First, find out which keypad pins are connected to the button rows. ![]()
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