The TCRT-LFSM–Digital sensor is used as a as a line sensor, but it can be used as a general-purpose proximity or reflectance sensor. The module consist of 5 IR emitter and receiver (phototransistor) pairs. In these high performance TCRT sensors, IR LEDs emits IR light and phototransistor receive that IR light after reflection. TCRT gives out different analogue voltage for different color and distance. This Analog voltage is given to comparator which compare analogue output with reference voltage set by user. Then comparator will give digital output that is either Logic ”High” Vcc or Logic “Low” GND. 5 sensors mounted in such a way that it can be directly used for line following and grid navigation. On board LED indicator helps user to check status of each sensor without using any additional hardware.
TCRT provides day light blocking filter so that erratic behavior is avoided. The module is very compact and it gives directly digital output. The power consumption is low for this module.