Using data from DS1307 RTC to trigger event
hi i attemting build led clock acts analog clock except without hands. i have set several shift registers drive leds around clock face. part working fine having trouble getting data rtc , using trigger next led turn on. for example second want 1 more led turn on. to want use second output of rtc , compare pre stored rtc second value , if different turn on next led. is best way approach this? or maybe put in interrupt sets flag high every time second value rtc changes? here code using data rtc. it works fine, can set time , view time/date on serial connection. code: [select] // date , time functions using ds1307 rtc connected via i2c , wire lib #include <wire.h> #include "rtclib.h" rtc_ds1307 rtc; void setup () { serial.begin(57600); wire.begin(); rtc.begin(); if (! rtc.isrunning()) { serial.println("rtc not running!"); // following line sets rtc ...