Arduino: build a line-following robot
A 2WD robot that follows a black electrical-tape line using three IR reflectance sensors. Bang-bang control done honestly, PID optional.
Tag
#tcrt5000
2 tutorials
Arduino: line-follower with the TCRT5000 array and PID
The PID line-follower: three TCRT5000 analog sensors feed one weighted error signal, and the robot steers in proportion to how far off the line it is.