To make the job really easy, we'll use the the AdafruitDS1307 RTC Breakout Board Kit (http://adafru.it/264)- it comes with all the parts you need,even a coin battery!The Kit does require a little light soldering. In theory you could use all the parts and build themonto a breadboard, but the coin holder is a little difficult since its not breadboard-friendly, soplease go ahead and build the kit. (http://adafru.it/aPf)When building the kit, leave o ut the 2.2K&o hm; resisto rs - by leaving them o ut,we fo rce the RTC to communicate at 3.3V instead o f 5V, which is better fo r thePi!Wiring is simple:1. Connect VCC on the breakout board to the 5.0V pin of the Pi2. Connect GND on the breakout board to the GND pin of the Pi3. Connect SDA on the breakout board to the SDA0 pin of the Pi4. Connect SCL on the breakout board to the SCL0 pin of the PiDONT FORGET TO POWER IT FROM 5V - THIS IS FINE AND SAFE FOR THE PI - JUSTMAKE SURE TO REMOVE THE 2.2K PULLUPS AS MENTIONED IN THE LARGE REDBOX UP ABOVE TO KEEP THE I2C PINS AT 3.3V LOGIC LEVELSThe diagrams below show the 2.2K? resistors in place - but plleasse rremove tthemeiittherr by nott ssollderriing tthem iin orr cclliippiing tthem outt iiff you diid ssollderr tthem iin!! Thiissway,, we''llll usse tthe Pii''ss 1..8K pullll--up rressiissttorrss tto 3..3V
Was there any resistor values that worked for anyone? I am trying to figure that out right now.