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On the I2C module, you will find a potentiometer that you can turn with a small screwdriver. You should see the backlight light up. You can tweak the contrast later if needed. Once that is done, we can start programming the LCD. This library has many built-in functions that make programming the LCD quite easy. Other libraries will probably work as well but might use slightly different names for the different functions.
Installing a. ZIP Arduino library The library does include some examples that you can use, but you will have to modify them to match your hardware setup. I have included many example codes below that you can use with the wiring setup I have shown earlier. First I will show you some basic example code and then I will explain the functions in more detail. If this is the case, you will need to find the actual address of the LCD before you can start using it. On the Arduino website, you can find a simple example sketch that scans the I2C-bus for devices.
If a device is found, it will display the address in the serial monitor. You can open the code in a new window by clicking on the button in the top right corner of the code field. Devices with higher bit address might not be seen properly. Serial ; Serial. Next, I will explain how the code works. As mentioned earlier we need both the wire. In the rest of this tutorial, I will cover more of the built-in functions of this library. The other library imports wire.
This is where you will need to change the default address to the address you found earlier if it happens to be different. In the setup, the LCD is initiated with lcd. Note that counting starts at 0 and the first argument specifies the column. So lcd. When you want to print numbers, no quotation marks are necessary. For example lcd.
You can use this function to display different words in a loop. The following example displays the blinking cursor for 5 seconds and then disables it for 2 seconds. The following example creates a blinking text effect. See the section about creating and displaying custom characters below for more info. This causes each character output to the display to push previous characters over by one space. If the current text direction is left-to-right the default , the display scrolls to the left, if the current direction is right-to-left, the display scrolls to the right.
This has the effect of outputting each new character to the same location on the LCD. The following example sketch enables automatic scrolling and prints the character 0 to 9 at the position 20,0 of the LCD.
How to create and display custom characters? CGROM generates all the 5 x 8 dot character patterns from the standard 8-bit character codes.
CGRAM can generate user-defined character patterns. For more info see the datasheet. Custom character example code The following example sketch creates and displays eight custom characters numbered 0 — 7.
More info: www. Each array consists of 8 bytes, 1 byte for each row of the 5 x 8 led matrix. In this example, 8 custom characters are created. Each row consists of 5 numbers corresponding to the 5 pixels in a 5 x 8 dot character.
A 0 means pixel off and a 1 means pixel on. This application automatically creates the character array and you can click on the pixels to turn them on or off. The first argument in this function is the number of the custom character and the second argument is the character array that we created.
As a parameter we use the number of the custom character that we want to display. I hope you found it useful and informative. I would love to know what projects you plan on building or have already built with these LCDs. Note that comments are held for moderation to prevent spam.
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