Shape Deformable Multi‐Role Sensors Adaptive for Smartphone by Using Morphing Ferrogel

Abstract Conventional wearable sensors require dedicated software and setups for data visualization and subsequent human‐machine interaction, limiting their portability and practicality. Smartphones offer data processing and visual output capabilities. However, current passive built‐in sensors in smartphones are limited in both type and function. Here, this study develops a morphing ferrogel (MFG) that can deform to diverse sensors (1D to 3D), enabling a smartphone to directly sense pressure, tension, wind speed, or even tiny human pulse waves (sub‐millimeter vibrations). The change of spatial magnetic field distribution of MFG, induced by external forces, can be sensed by the built‐in magnetometer and visualized on the smartphone screen, yielding mechanical‐to‐magnetic‐to‐electrical conversion. The MFG‐Smartphone system achieves 97% accuracy in controlling wheelchairs for disabled people. Critically, this MFG‐Smartphone system only requires a commercial smartphone, with no additional hardware. This scalable approach bridges lab prototypes and real‐world applications, enabling smartphone‐integrated physiological monitoring.