This wil be a simple instructable on how to change the I2C addres of 1602 2004 lcd adapter.
Iv decid it to make it after a frustrating attempt to find the address table on the net
Step 1: Step 1 Locating the 3 Address Jumpers
If your adapter look eny thing like mine, thous 3 jumpers should be exactly as shown on the picture abow,
once You have located them tak a closer look. factory setap (in my case) was that non of them was conected wich means that the addres of the device is 0x27
Step 2: Step 2 Changing the Address
To chang the address, all You nead to do is make a solder connections on the jumpers, in one of 8 combinations, above you have my address table.
Here is the link to where i get my adapters http://www.aliexpress.com/snapshot/6158284223.html
the shipment was fast and the quality is very good
Now once you know how to change the address take your arduino plug the 4 cables to your LCD and be creative :)
Step 3: Step 3 Plug Everything Together
the picture should help you achieving thisgoal