Bundle ValueA practical expansion bundle for users who want the complete UNO kit plus extra modules for robot and automation concepts; Buy Together AdvantageUse the complete kit components with multiple HC-SR04 sensors to build projects that sense space and movement; 5PCS HC-SR04 Ultrasonic SensorsUse it as five HC-SR04 ultrasonic modules for 5V distance measurement, obstacle detection and interactive robot sensing; UNO R3 Most Complete KitAdd it to create a deeper learning path with more components, guided builds and expansion ideas; Project IdeasBuild range finders, avoidance demos, servo sweep scanning, motion-triggered alerts and learning stations; check wiring, voltage, libraries and drivers before custom experiments