Reply To: Line following

[Simon]

IR detectors are the norm for line followers as nowhere near as sensitive to changes in visible light levels

Something like this
http://www.ebay.co.uk/itm/3-Way-Infrared-IR-Line-Tracking-Sensor-Module-For-Raspberry-Pi-Arduino-CHIP-24/221759541670?_trksid=p2047675.c100011.m1850&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20140107083358%26meid%3D2dc635f1c5424cb5b720d7966bf300f5%26pid%3D100011%26rk%3D1%26rkt%3D3%26sd%3D141385963222

You can have a play with a IR Proximity Crumb but its not ideal for close range line following use but if you tilt it at an angle – it does the job 🙂
http://4tronix.co.uk/store/index.php?rt=product/product&product_id=494