Ultrasonic sensors overcome many of the weaknesses of IR sensors – they provide distance measurement regardless of color and lighting

Module Knock Hit sensor module KY-031 The hit sensor registers hits and sends a high level signal to the output

WATER LEVEL SENSOR The moisture sensor detects water and other liquids and outputs a corresponding analog signal via its signal

HC-SR505 This Mini-PIR motion detector HC-SR505 is based on infrared technology and can be controlled with high sensitivity and reliability.