BMP180 in GY-68, RTC DS1307 together on I2C

hi all,

I searched and I found this topic, but it isn't clear for me: http://forum.arduino.cc/index.php?topic=281267.0

GY-68 works at 3,3 Volt and RTC at 5 Volt.

I would like to use them together, how can I do and I do I wire the pull up resistor to VDD?

Thx for your help

I use a logic level converter by Adafruit that works well. Put all your 3.3v slaves on the LV side and all the 5v slaves on the HV side. https://www.adafruit.com/products/757

is it the only way?