I have had a lot of success with the QRD1114 (datasheet). See my old website for an example project for a robot line detector tracking. The included software is not for the Arduino but the hardware can be reused.
I have had a lot of success with the QRD1114 (datasheet). See my old website for an example project for a robot line detector tracking. The included software is not for the Arduino but the hardware can be reused.