I went through a youtube video on understanding I2C and how I can use it with Arduino. One part of the video that completely went over my head was the part when they are using the register to access hr,min, and sec. I do not understand how he came up with the hex codes the way he did. Here is the da…

I2C and DS1307 real-time clock IC

j514 March 29, 2012, 12:16am 6

Have a look here:

Hope that helps!