An IR (Infrared) sensor module designed for obstacle sensing and line following, often denoted as “Blue IR Sensor Module,” combines infrared technology with functionality for detecting obstacles and following lines. Here’s a detailed description:

Technology and Sensing Principle: The module utilizes infrared light to detect obstacles and follow lines. It typically consists of infrared light-emitting diodes (LEDs) and infrared photodiodes.
IR LED Configuration: Equipped with an array of infrared LEDs that emit infrared light. The emitted infrared light is used to illuminate the surface in front of the sensor for detection purposes.
Photodiode Array: When an obstacle is present in front of the sensor, the infrared light emitted by the LEDs reflects off the obstacle and is detected by the photodiodes. This detection triggers a response, such as signaling the presence of an obstacle or initiating a course correction.
Line Following: When used for line following applications, the IR sensor module is positioned over a surface with a visible line or path. The infrared LEDs illuminate the surface, and the photodiodes detect the contrast between the line and its surroundings. Based on the detected contrast, the module guides a robotic or automated system to follow the line accurately.
Adjustable Sensitivity: Often, these modules offer adjustable sensitivity settings to fine-tune the detection range or line-following capabilities based on the specific application requirements.
Integration: Designed for easy integration into robotics, automated vehicles, or systems requiring obstacle avoidance and line-following functionality. Compact, lightweight, and versatile, making it suitable for various DIY projects and commercial applications.