Aj Sr04m Datasheet [upd] Page

20cm to 800cm (depending on the specific version and surface). Working Frequency: Beam Angle: ~75 degrees. Precision: High accuracy (roughly 2mm resolution). Probe Structure: Integrated closed-type splash-proof wire probe. Working Principle and Modes

#include <SoftwareSerial.h> SoftwareSerial ajSerial(10, 11); // RX, TX (Connect AJ-SR04M TX to pin 10, RX to pin 11)

Trigger Pulse: 10µs minimum, 20µs typical Cycle Interval: 50ms minimum (20Hz max update rate) Echo Pulse: 150µs (no object) to 38ms (5 meters) Aj Sr04m Datasheet

Serial.print("Distance: "); Serial.print(distance); Serial.println(" cm"); delay(100);

The following datasheet provides a detailed overview of the AJ Sr04m's specifications: 20cm to 800cm (depending on the specific version

While the popular HC-SR04 is excellent for indoor robotics, the AJ-SR04M superior in harsh environments due to its separate probe design, which allows the sensitive electronics to remain dry while the sensor is submerged or exposed to rain. The AJ-SR04M also generally provides a longer maximum range (up to 8m vs. 4m for HC-SR04). iotwebplanet Common Applications Outdoor Distance Measurement: Parking sensors, water level monitoring in tanks. Industrial Control: Measuring distances in dusty or wet environments. Smart Car/Obstacle Avoidance: Outdoor robots, unmanned vehicles. Vertical Height Measurement: Monitoring drone altitude. iotwebplanet Limitations Blind Area: The sensor has a minimum detection range of 20cm. Power Consumption:

| Pin Number | Pin Name | Description | | --- | --- | --- | | 1 | VCC | Power supply (3.3V) | | 2 | GND | Ground | | 3 | OUT | Analog voltage output (0-3.3V) | | 4 | NC | Not connected | | 5 | NC | Not connected | 4m for HC-SR04)

The AJ-SR04M typically features a 4-pin JST connector or an exposed 4-wire cable (Red, Black, Yellow, Green/White). The provides the following pin mapping:

The is a high-performance, waterproof ultrasonic ranging module designed for precise non-contact distance measurement in harsh environments . Unlike the standard HC-SR04, it features a separated probe design with an IP67 rating, making it ideal for outdoor applications like water level monitoring, vehicle reversing sensors, and industrial obstacle avoidance. Technical Specifications Fabian Enterprises