added arduino sketch

section01/Lec05/hello_lcd_c.ino

+#include <LiquidCrystal.h>
+#include <stdio.h>
+
+
+static FILE uartout = {0};
+
+LiquidCrystal lcd(8,9,4,5,6,7);
+
+static int uart_putchar(char c, FILE *stream)
+{
+  Serial.write(c);
+  return 0; 
+}
+
+void setup() {
+  // put your setup code here, to run once:
+  Serial.begin(9600);
+  fdev_setup_stream(&uartout, uart_putchar, NULL, _FDEV_SETUP_WRITE);
+  stdout = &uartout;
+  printf("startup\n");
+  
+  
+  lcd.begin(16,2);
+  lcd.setCursor(0,0);
+  lcd.write("hello"); 
+
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  printf ("hello\n");
+  delay(500);
+}