4 channel infrared tracking sensor module ir line patrol for arduino smart car feature: smart car or a robot hunt (including black and white lines), walking path along the black line, also known as tracking. Smart car to avoid obstacle and cliff, anti-drop. Can be applied to other automation applications of photoelectric reflex. Specification: working voltage: dc 3. 3v-5v working current: try to choose more than 1a power supply working temperature: -10ð c to +50ð c mounting aperture: m3 screw detection range: 1mm to 60cm adjustable, the closer the performance more stable, white reflects the farthest distance. Output interface: 6 wire interface (1234 to 4 signal output ends, + positive power, - for the negative power is ground) the output signal: ttl level (can be directly connected to i/0 microcontroller, infrared light reflected back to the sensor induction, the red indicator light, output low level; no infrared light, the indicator light does not shine, the output high. )