This monstrosity of a module can be added to a robot to add five line follower sensors. Some of the soldering on this module is not pretty but it works great.Features:4 line-tracking sensors spaced out horizontally1 centered tracking sensor optimized for crossing lines1 pair of emitter-detector aimed forward for collision avoidance, with sensitivity adjust1 micro-switch for use with mechanical bumpersLED Indicators on every sensorActive LS14 chip providing clean hysteresis on each sensor for jitter-free indicationDetection distance of 0-4 cm (black and white line sensor) )Input voltage :3.0-5 .5 Vdigital output (Active HIGH for detected light object, bump switch)About 5.4 inches acrossTutorial