RTC DS1307 With Arduino Without RTC library

Projects General Guidance
1

Hello ,

When I connected RTC DS1307 with Arduino by this code :

#include<Wire.h>



void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
Wire.begin();
Wire.beginTransmission(0x68);
 Wire.write("START");
 Wire.endTransmission(true);
  Wire.requestFrom(0x68,7 );
  while(Wire.available()) {
int c = Wire.read(); 
Serial.println(c-200);
delay(2000);
}
}
void loop() {
 
 
  // put your main code here, to run repeatedly:

}

I get those various values in Serial Monitor

255
253
255
251
207
234
239

what should i do if i wanted to show SECONDS,MINUTES,HOURS,DAY,DATE,MONTH and YEAR ?

rtc without library.png
rtc without library.png1755×1347 295 KB

2 
 Wire.write("START");

Shouldn't you be writing the address of the register that you want to start reading from, probably zero, instead of the word "START" ?

3

Kiroloes:
what should i do if i wanted to show SECONDS,MINUTES,HOURS,DAY,DATE,MONTH and YEAR ?

Chuck out that junk and use something that works. You might just check that wiring as well. If the module supplier says you must use those resistors, then fine, but I have never seen anything like that.