Connecting Multiple Backpacks

The coolest part about the I2C backpacks is that you can connect more than one using just the same 2 pins.  This opens possibilities for all kinds of multi-display projects.

For a project that shows this is practice, check out this page on animating multiple LED backpacks

Wire it Up

To connect another backpack to your project, just wire it in parallel with the first one as in the diagram below.

Configure the Address

For each backpack you add, you need to configure a different I2C address.  You can keep adding backpacks in the same way until you run out of addresses.  See the next page for how to configure the address on your backpack.
This guide was first published on Jul 29, 2012. It was last updated on Oct 19, 2018. This page (Connecting Multiple Backpacks) was last updated on May 04, 2015.