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libraries/Adafruit_LiquidCrystal/examples/HelloWorld_i2c/HelloWorld_i2c.ino

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+/*
+ Demonstration sketch for Adafruit i2c/SPI LCD backpack
+ using MCP23008 I2C expander
+ ( https://learn.adafruit.com/i2c-spi-lcd-backpack )
+
+ This sketch prints "Hello World!" to the LCD
+ and shows the time.
+
+  The circuit:
+ * 5V to Arduino 5V pin
+ * GND to Arduino GND pin
+ * CLK to Analog #5
+ * DAT to Analog #4
+*/
+
+// include the library code:
+#include "Adafruit_LiquidCrystal.h"
+
+// Connect via i2c, default address #0 (A0-A2 not jumpered)
+Adafruit_LiquidCrystal lcd(0);
+
+void setup() {
+  Serial.begin(115200);
+  // while(!Serial);
+  Serial.println("LCD Character Backpack I2C Test.");
+
+  // set up the LCD's number of rows and columns:
+  if (!lcd.begin(16, 2)) {
+    Serial.println("Could not init backpack. Check wiring.");
+    while(1);
+  }
+  Serial.println("Backpack init'd.");
+
+  // Print a message to the LCD.
+  lcd.print("hello, world!");
+}
+
+void loop() {
+  // set the cursor to column 0, line 1
+  // (note: line 1 is the second row, since counting begins with 0):
+  lcd.setCursor(0, 1);
+  // print the number of seconds since reset:
+  lcd.print(millis()/1000);
+
+  lcd.setBacklight(HIGH);
+  delay(500);
+  lcd.setBacklight(LOW);
+  delay(500);
+}
+