• Introduction Using an LCD is one of the ways to output information in Arduino projects. The main drawback about an LCD is that it occupies too many pins on your Arduino board. But there are some serial implementations such as. So I got one. Background If you visit the reference page on the Arduino website, you will see that it is based on Hitachi (or a compatible) chipset.

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All Libraries. A list of the 1643 libraries registered in the Arduino Library Manager. An Arduino library for serial logging. SoftwareSerial Library Download: SoftwareSerial is included with Arduino Real UART Serial The hardware UART Serial port should always be used, if possible, before considering SoftwareSerial.

An LCD needs many pins like data, clock, select, contrast adjustment, etc. Which consumes your Arduino resources. However, a serial LCD eliminates the necessity for so many pins. Actually, it uses another microprocessor which drives the LCD. You command this microprocessor from your Arduino board over a stream and it handles the rest for you. Hardware Setup Serial LCD has three lines which are GND, Vcc, and Rx. All you need is to connect the Rx (receive) line of the serial LCD to the Tx (transmit) line of the stream on Arduino board.

This stream can be either. It is up to you which type of communication to use. If you decide to use hardware serial, you will use the digital pin1 of your Arduino board as serial transmit. Pin0 is the receive pin of Serial and Pin1 is for transmit. But in that case, I advice you to disconnect Arduino board from your computer, because Serial is used as shared resource for the serial communication between the computer and the board.

If you will use software serial, the only thing is to decide which digital pin to use as serial transmit. One more thing; it is better to use an external power source for your Arduino board because an LCD drains more power than that computer's USB port can provide, or you take the risk of damaging your Arduino board. Be aware that you may need to do some soldering if you decide to buy a serial LCD like mine. There is another PCB at the back of the LCD soldered to the LCD's pins. Designs: Click to enlarge images.

Sorry for the connections of the LCDs on above images. I couldn't find a serial LCD part in the Fritzing editor, so I have used normal LCDs.

Actually, there exist a 3-pin connector on the side of the serial LCD. Using the Code You can communicate with this model of serial LCD as. As you see, commands are one-byte values with some parameters.

What I did in this library is to convert them into more meaningful functions. Assuming that you have placed the library files in the libraries folder of your Arduino IDE, you can include the header file in your sketch.

If you will use SoftwareSerial as your communication infrastructure, you have to include its header, too. You can download from the official Arduino website.

#include // SoftwareSerial header #include // SerialLcd header SoftwareSerial ss( 3, 4); // rx=3, tx=4 SerialLcd lcd(&ss); // serial lcd If you use hardware serial ( Serial), you just pass the reference of it to the SerialLcd constructor. #include SerialLcd lcd(&Serial); Let's continue with software serial. In the setup function, you initialize the stream (in this case ss) with 9600 baud rate. Then use lcd as the output device.

Ss.begin( 9600); Usage is straightforward. Displaying a string: lcd.println( ' first line'); lcd.println( ' second line'); Clear screen and move cursor to position 0: lcd.clr(); Moving cursor to a specific location needs some explanation. If your LCD is 16x2 type, then moving cursor to location 20 places cursor on the 5 th column of the second row. Position index starts from 1. Lcd.setCursorPos( 20); lcd.print( ' X'); You can send any ASCII character and there is an extension list for the printable characters.