PROXIMITY SWITCH
CYTRON
POLOLU
SEEEDSTUDIO
SPARKFUN ELECTRONICS
WAVESHARE
Cytron
MAKER-OBJECT
Pololu
4107
4307
4405
961
QTR-HD-05A Reflectance Sensor Array
QTR-HD-07A Reflectance Sensor Array
QTR-HD-07RC Reflectance Sensor Array
QTRX-HD-05A Reflectance Sensor Array
QTRX-HD-07A Reflectance Sensor Array
QTRX-HD-07RC Reflectance Sensor Array
QTRX-MD-05A Reflectance Sensor Array
SeeedStudio
101020174
Grove Infrared Reflective Sensor v1.2
Sparkfun Electronics
SEN-09299
SEN-13162
ZX Distance and Gesture Sensor (12in)
Waveshare
12225
20465
Photo Interrupter