The LM35 temperature sensor is a precision integrated circuit that measures ambient temperature and provides a linear analog voltage output proportional to the temperature in Celsius. It has a temperature range of -55°C to +150°C, low self-heating, and requires no external calibration. Its small size and low cost make it ideal for use in a variety of temperature sensing applications.

The Obstacle Infrared Sensor module is an electronic device that detects the presence of an obstacle by emitting and detecting infrared light. It consists of an infrared transmitter and receiver that are mounted on the same PCB board. When an object is present in the range of the module, the infrared beam is reflected back to the receiver, which triggers the sensor module to send a signal to the microcontroller or processor to take the necessary action. It is commonly used in robotics, automation systems, and security systems to detect obstacles and avoid collisions.

The Infrared AC IR PIR Switch Module Body Motion Auto On/off Lights is a compact and efficient device that uses a passive infrared (PIR) sensor to detect human motion and automatically turn on or off the lighting system in a room. It can be easily installed and connected to the AC power supply, and is compatible with a wide range of lighting systems including incandescent bulbs, fluorescent lights, and LED lights. The module also features an adjustable timer for automatic shut off after a period of inactivity, and can be manually controlled using an infrared remote. With its energy-saving features and reliable performance, this device is an ideal solution for automated lighting control in both residential and commercial settings.