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:

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.

is it the only way?