On my Arduino Uno, when I'm not using the serial everything seems in order:
#include <LiquidCrystal.h> LiquidCrystal lcd(1, 2, 4, 5, 6, 7); void setup() { // put your setup code here, to run once: lcd.begin(16, 2); lcd.clear(); lcd.print("Prints"); lcd.setCursor(0, 1); lcd.print("Well"); } void loop() { delay(1000); } However the moment I open the serial port with:
Serial.begin(9600); The problem starts.
Clearing the LCD does not clear it but prints a character with 4 horizontal lines. Trying to move the cursor will print a different unrecognisable character. Sending things to the Arduino via the Serial port prints gibberish on the LCD.
Any idea why? Is there a way to work with the LCD and the serial port simultaneously? I require the serial port in order to control the Arduino from NodeJS.
#include <LiquidCrystal.h> LiquidCrystal lcd(1, 2, 4, 5, 6, 7); void setup() { // put your setup code here, to run once: lcd.begin(16, 2); lcd.clear(); lcd.print("Prints"); lcd.setCursor(0, 1); lcd.print("Well"); Serial.begin(9600); while (!Serial) { ; // wait for serial port to connect. Needed for Native USB only } } void loop() { lcd.clear(); // This will print 4 horizontal lines character instead of clearing delay(500); } 
