A21 IP67 Waterproof Ultrasonic Sensor 3~500cm, 3cm Blind Zone

• A21 Datasheet
• A21 User Guide

DYP Sensor A21 IP67 Waterproof Ultrasonic Distance Sensor For 3cm-500cm Robot Obstacle Detection And Industrial Distance Measurement

The DYP Sensor A21 IP67 Waterproof Ultrasonic Distance Sensor is designed for accurate non-contact distance measurement in robotics, automation, obstacle-avoidance, liquid-level sensing, and outdoor detection applications. With a 3 cm to 500 cm measuring range, millimetre-level resolution, and a compact PVC housing, it is well-suited for demanding environments where dust, water, and noise can affect sensor performance.

This ultrasonic distance sensor uses high-output sound power, continuously variable gain, real-time background calibration, and noise-suppression algorithms to deliver stable distance readings with reduced interference. The A21 sensor also addresses common limitations of ultrasonic modules, including large blind zones, narrow measurement angles, slow response times, and poor installation adaptability.

The module supports multiple output options including UART automatic output, UART controlled output, PWM controlled output, TTL switching output, RS485, IIC, and CAN output. Its configurable 5-level range settings, selectable angle levels, and built-in noise-reduction settings make it suitable for flexible integration across robot-control, smart-equipment, and industrial-sensing systems.

Key Features

• Wide Measuring Range: Measures distance from 3 cm to 500 cm for short-range and mid-range detection tasks.
• IP67 Waterproof Design: Dustproof and water-resistant structure supports reliable use in harsh or outdoor environments.
• Low Blind Zone: Minimum blind area can reach 2.5 cm depending on configuration and operating conditions.
• Multiple Output Modes: Supports UART auto, UART controlled, PWM controlled, TTL switching output, RS485, IIC, and CAN output.
• Configurable Range Levels: Supports 5 range settings of 50 cm, 150 cm, 250 cm, 350 cm, and 500 cm through instructions.
• Wide Voltage Input: Operates from 3.3 V to 24 V for compatibility with embedded and industrial-control systems.
• Fast Response Time: Data output time can be as fast as 13 ms for responsive distance feedback.
• Selectable Measurement Angles: Supports 4 angle levels for different installation and application requirements.
• Built-In Noise Reduction: Provides 5-grade noise-reduction setting for stable performance in noisy environments.
• Smart Acoustic Processing: Built-in algorithm identifies and filters interference sound waves automatically.
• Low-Power Support: UART controlled and PWM controlled modes can support sleep power consumption of 5 uA or lower.
• Remote Firmware Upgrade: Supports remote firmware upgrade for easier maintenance and long-term deployment.
• Strong Installation Adaptability: Compact PVC housing and simple installation method improve mechanical reliability.

Applications