The M5Stack Unit I/O is a GPIO interface ultrasonic range sensor. This module features an RCWL-9620 ultrasonic distance measurement chip with a 16mm probe, which the ranging accuracy can reach 2cm-450cm (accuracy up to 2%). This sensor determines the distance to a target by measuring time lapses between the transmitting and receiving of the pulse signal, users can directly obtain the distance value through IO control mode. It\’s ideal to apply in robotics obstacle avoidance, fluid level detection, and other applications that require you to perform measurements. Features RCWL-9620 GPIO communication interface Measuring range: 2cm-450cm Protective housing Built-in temperature compensation, reduce the temperature drift Support UIFlow platform Package Contents 1x Unit UNIT SONIC IO 1x HY2.0-4P cable (20cm) Specifications Specifications Parameters Ultrasonic Ranging Single Chip RCWL-9620 Range 2cm-450cm Probe Specifications 16mm Receiving/Transmitting Frequency 40KHz Receiving sensitivity -65dB Pointing angle 60 Measurement accuracy 2% Working current 3mA Net weight 11.5g Gross weight 26g Product size 56 * 24 * 15mm Packing size 76 * 47 * 29mm Resources Documentation page Video