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发表于 2013-7-14 12:54:24
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显示全部楼层
lcd是void setup() 函数的局部变量,应该把它声明成全局的- #include <DS1307RTC.h>
- #include <Time.h>
- #include <Wire.h>
- #include <LiquidCrystal.h>
- LiquidCrystal lcd(12,11,5,4,3,2);
- void setup() {
- lcd.begin(16,2);
- Serial.begin(9600);
- while (!Serial) ; // wait for serial
- delay(200);
- Serial.println("DS1307RTC Read Test");
- Serial.println("-------------------");
- }
-
- void loop() {
- tmElements_t tm;
-
- if (RTC.read(tm)) {
- Serial.print("Ok, Time = ");
- lcd.setCursor(4, 0);
- print2digits(tm.Hour);
- Serial.write(':');
- print2digits(tm.Minute);
- Serial.write(':');
- print2digits(tm.Second);
- Serial.print(", Date (D/M/Y) = ");
- Serial.print(tm.Day);
- Serial.write('/');
- Serial.print(tm.Month);
- Serial.write('/');
- Serial.print(tmYearToCalendar(tm.Year));
- Serial.println();
- } else {
- if (RTC.chipPresent()) {
- Serial.println("The DS1307 is stopped. Please run the SetTime");
- Serial.println("example to initialize the time and begin running.");
- Serial.println();
- } else {
- Serial.println("DS1307 read error! Please check the circuitry.");
- Serial.println();
- }
- delay(9000);
- }
- delay(1000);
- }
-
- void print2digits(int number) {
- if (number >= 0 && number < 10) {
- Serial.write('0');
- }
- Serial.print(number);
- }
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