I have programmed my Arduino to display the current time on a LCD. I would like to integrate this with a buzzer and lights to create an alarm. My approach it to read the time and compare it to an AlarmSetTime that I would choose. I was simply going to use an IF statement and digitalWrite HIGH to a pin when triggering the buzzer/lights when the date/time comparison was true. How do I read the time? Seems simple, but I keep getting compile errors. Here is my base code to display the time:
/*****************************************************
- name:Real-time Clock Module
- function:you can see the current date and time displayed on the I2C LCD1602.
******************************************************/
//Email:support@sunfounder.com
//Website:www.sunfounder.com
//include the libraries
#include <stdio.h>
#include <string.h>
#include <DS1302.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2); // set the LCD address to 0x27 for a 16 chars and 2 line display
uint8_t RST_PIN = 5; //RST pin attach to
uint8_t SDA_PIN = 6; //IO pin attach to
uint8_t SCL_PIN = 7; //clk Pin attach to
/* Create buffers */
char buf[50];
char day[10];
String comdata = "";
int numdata[7] = { 0 }, j = 0, mark = 0;
/* Create a DS1302 object */
DS1302 rtc(RST_PIN, SDA_PIN, SCL_PIN);//create a variable type of DS1302
void print_time()
{
/* Get the current time and date from the chip /
Time t = rtc.time();
/ Name the day of the week /
memset(day, 0, sizeof(day));
switch (t.day)
{
case 1:
strcpy(day, "Sun");
break;
case 2:
strcpy(day, "Mon");
break;
case 3:
strcpy(day, "Tue");
break;
case 4:
strcpy(day, "Wed");
break;
case 5:
strcpy(day, "Thu");
break;
case 6:
strcpy(day, "Fri");
break;
case 7:
strcpy(day, "Sat");
break;
}
/ Format the time and date and insert into the temporary buffer /
snprintf(buf, sizeof(buf), "%s %04d-%02d-%02d %02d:%02d:%02d", day, t.yr, t.mon, t.date, t.hr, t.min, t.sec);
/ Print the formatted string to serial so we can see the time */
Serial.println(buf);
lcd.setCursor(2, 0);
lcd.print(t.yr);
lcd.print("-");
lcd.print(t.mon / 10);
lcd.print(t.mon % 10);
lcd.print("-");
lcd.print(t.date / 10);
lcd.print(t.date % 10);
lcd.print(" ");
lcd.print(day);
lcd.setCursor(4, 1);
lcd.print(t.hr);
lcd.print(":");
lcd.print(t.min / 10);
lcd.print(t.min % 10);
lcd.print(":");
lcd.print(t.sec / 10);
lcd.print(t.sec % 10);
}
void setup()
{
Serial.begin(9600);
rtc.write_protect(false);
rtc.halt(false);
lcd.init(); //initialize the lcd
lcd.backlight(); //open the backlight
//Time t(2018, 4, 22, 17, 44, 00, 1);//initialize the time
/* Set the time and date on the chip */
//rtc.time(t);
}
void loop()
{
/add the data to comdata when the serial has data /
while (Serial.available() > 0)
{
comdata += char(Serial.read());
delay(2);
mark = 1;
}
/ Use a comma to separate the strings of comdata,
and then convert the results into numbers to be saved in the array numdata[] /
if (mark == 1)
{
Serial.print("You inputed : ");
Serial.println(comdata);
for (int i = 0; i < comdata.length(); i++)
{
if (comdata == ',' || comdata == 0x10 || comdata == 0x13)
_ {
* j++;
}
else*
* {
numdata[j] = numdata[j] * 10 + (comdata - '0');
}
}
/ The converted numdata add up to the time format, then write to DS1302*/
* Time t(numdata[0], numdata[1], numdata[2], numdata[3], numdata[4], numdata[5], numdata[6]);
rtc.time(t);
mark = 0;
j = 0;
/ clear comdata ，in order to wait for the next input /
comdata = String("");
/ clear numdata /
for (int i = 0; i < 7; i++) numdata = 0;
}
/ print the current time /_
print_time();
_ delay(1000);
}*_