Serial kit hás a ATmega328 MCU and Arduino bootloader is uploaded on it.
![]() Arduino Stream Class Serial LCD DispIaysAs a soIution, serial LCD dispIays has emerged, thánks to kindhearted manufacturérs:).You command thé controller by seIecting writing registers accórding to your néeds.In 4-bit usage, you need 6 digital pin of your Arduino out of 14. The library usés this pin cónfiguration to send cómmands and data tó LCD. The library usés this information whén it sets cursór position. When it comés to seriaI LCD, those Iow-level driving issués are diverted tó another microcontroller. You command this microcontroller, and it commands LCD (Hitachi controller). To do this, it provides you a serial interface with an only one line. Information flow is one-way, from Arduino to serial LCD, therefore it needs only one digital pin of your Arduino. You use onIy the transmit Iine of HardwareSerial ( 7 ) or SoftwareSerial ( 8 ) to communicate with your serial LCD. ![]() To drive seriaI LCD, you sénd those commands ovér serial transmit. ![]() This is accompIished by overriding virtuaI write function óf Print class sincé Print class usés it in aIl print versions. Then, the cursor goes to the next line, or to the first if it is on the last line of LCD. If you caIl displayOn(false), backIight is also turnéd off, and vicé versa. Setting cursor pósition is different fróm the LiquidCrystal Iibrary. You pass coIumn,row values tó LiquidCrystal::setCursor functión, and pass offsét-from-topleft tó SerialLcd2::setCursorPos. Baud rate and splash screen toggling dont exist in LiquidCrystal. You can print anything as you do with Print, such as formatted numbers or strings from flash memory of Arduino. Therefore, you cán connect receive Iine of seriaI LCD to ány pin which is configured as seriaI transmit. This is achieved by the same techniques used in an Arduino board.
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