Some readers may recall building a line-following robot ... uses a whopping 32 IR sensors to follow a black line across a concrete workshop floor, adjusting its path using a steering motor ...

Infrared line tracker modules ... Arduino’s onboard LED (D13 LED) here works as a simple visual indicator to show the event counter activity. To read the event counter, you can use Arduino’s Serial ...

This time around he’s bent the IR emitter and receiver downward to use as a reflectance sensor. This gives it the ability to follow a dark line on a light surface.

In this article, we implement a rain and ice sensor by ... as a counter using the internal clock at 25 kHz (configured in OSC). CNT2 provides the 10-μs HIGH level pulse. IR LED emitter driver ...