The Hall Effect Counter Sensor Module is a compact magnetic detection module based on the 3144E Hall Effect sensor and LM393 comparator. It detects magnets and magnetic-field changes and provides a clean digital HIGH/LOW output, making it ideal for motor speed measurement, wheel rotation, object counting, and position detection. It operates from 3.3V–5V DC, includes power and signal LEDs, and features M3 mounting holes for easy installation. Suitable for Arduino, robotics, automation, and DIY electronics projects.

The HR202 Humidity Detection Sensor Module is a compact humidity sensing module featuring an HR202 sensor and LM393 comparator for reliable ambient humidity detection. It provides adjustable sensitivity, analog AO output, and digital DO output, with onboard power and output indication LEDs. The module can be connected to Arduino, ESP32, and other microcontrollers for humidity monitoring and automatic control applications. It is suitable for greenhouse projects, IoT systems, environmental monitoring, humidity alarms, and humidity control.