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RAMPS_TEST_LCD/RAMPS_TEST_LCD.ino

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+/* 
+ Tests de la carte ramps 
+ * Note: On most Arduino boards, there is already an LED on the board
+ connected to pin 13, so you don't need any extra components for this example.
+ 
+ 
+ DISPLAY ON Arduino Mega2560 VIA RAMPS
+ * LCD RS pin to digital pin 16
+ * LCD Enable pin to digital pin 17
+ * LCD D4 pin to digital pin 23
+ * LCD D5 pin to digital pin 25
+ * LCD D6 pin to digital pin 27
+ * LCD D7 pin to digital pin 29
+ * LCD R/W pin to ground
+ 
+ 
+ 
+ */
+// include the library code for LCD display:
+#include <LiquidCrystal.h>
+ 
+// constants won't change. They're used here to 
+// set pin numbers:
+const int led1 = 13;        // the number of the standard led
+const int button = 41;      // the number of the pushbutton pin
+const int speakerPin = 37;  // buzzer connected
+
+//LCD RS pin to digital pin 16
+const int lcdrs=16; 
+//LCD Enable pin to digital pin 17
+const int lcde=17;
+//LCD D4 pin to digital pin 23
+const int lcdd4=23; 
+//LCD D5 pin to digital pin 25
+const int lcdd5=25; 
+//LCD D6 pin to digital pin 27
+const int lcdd6=27; 
+//LCD D7 pin to digital pin 29
+const int lcdd7=29; 
+  
+// say ON is alighted and OFF is not
+// led are lighted when pin is HIGH
+const int ON=HIGH;
+const int OFF=LOW;
+const int FALSE=LOW;
+const int TRUE=HIGH;
+//variable to keep state of display done
+int done=FALSE;
+// initialize the library with the numbers of the interface pins
+// create object: lcd (available as global object)
+LiquidCrystal lcd(16,17,23,25,27,29);
+  
+void setup() {
+  pinMode(button, INPUT);     // button is input
+  digitalWrite(button,HIGH);  // need pull up resistor: HIGH/TRUE when not activated,  LOW/FALSE when activated
+  
+    // set up the LCD's number of columns and rows:
+  lcd.begin(20, 4);
+  // shutdown LED
+  digitalWrite(led1, OFF); 
+  // clear LCD display
+  lcd.clear();
+  // wait 2 sec
+  delay(2000);
+}
+
+void loop() {
+  // write once to avoid flickering of display
+  if (!done) {
+   lcd.clear();
+   digitalWrite(led1, OFF);
+   displayLcd(0,0,"hello");
+   displayLcd(1,1,"salut");
+   done=true;
+  } 
+  if (!digitalRead(button)) {
+    done=false;
+    lcd.clear();
+    delay(5);
+    digitalWrite(led1, ON);
+    displayLcd(0,0,"Bouton !");
+    while (!digitalRead(button)) {}; 
+  } 
+}
+
+void displayLcd(int c, int l, String t) {
+ lcd.setCursor(c,l);
+ lcd.print(t); 
+}