SparkFun Line Follower Array Hookup Guide

Contributors: MTaylor

Setting the Jumpers

The array has two configurable options: I²C address and I²C pull-up voltage.

I²C address

If you need to change the address of the array, move the solder jumper to set A0 and A1. The silkscreen table gives a reference. Seen in the photo, the default address is 0x3E. For example, if you want to use address 0x70, move A1 to the '1' position and leave A0 at '0'.

I²C pull-up voltage

The I²C bus of the array is pulled up to 3.3V by default. This should work for 3.3V and 5V boards, but if you need to change it explicitly to 5V, cut the copper bridge and add a solder jumper to the "5V" side. The other jumper is included if you need to disconnect the I²C bus from the pull-ups entirely. This will only be used in specific situations, for instance if the microcontroller side has strong pull-ups and the array's resistors need to be disabled.