4-way infrared tracking / line follower / obstacle avoidance sensor

--------------UPDATE STOK= 4----------------- 4 Channels IR Reflective Sensor (ER-SPS40201S) 4-way Infrared Tracking Sensor This 4 channels IR reflective sensor includes 4 IR sensors and mainboard to handle all the signals. Each IR reflective sensor is composed of an IR emitter and a receiver, if something is in the measuring range, the sensor would outputs related signal. There are also 4 potentiometers on the mainboard so that the measuring range can be adjusted as you wish. Application Idea Smart car; Line and edge following; omni-directional detecting; On-board indicator; Specification Supply Voltage: 3.3V ~ 5.5V; Supply current: 1A recommended; Measuring range: Adjustable, range from 1mm to 60cm; Output: TTL 0/1, when the sensor received the reflected infrared, the indicate LED light and output TTL 0, otherwise output the TT L 1, and the LED off.