This Infrared Obstacle Avoidance Sensors Module has a builtin IR transmitter and IR receiver that sends out IR waves and then looks for the reflected IR waves to detect the presence of any objects in front of the sensor module. The module has an on board potentiometer that let users adjust the detection range. This sensor can be used in light and complete darkness.
There is an obstacle, the green indicator light on the circuit board
Detection distance: 2 ~ 30cm
Detection angle: 35 °
Comparator chip: LM393
3mm screw holes for easy mounting