​JSN-AJ-SR04M Integrated Reverse Radar, Waterproof Ultrasonic Sensor, Distance Measuring Module

Product Descriptions：

The product adopts industrial grade integrated ultrasonic probe design, waterproof type, stable performance, welcome to purchase. The usage of this module is completely modest for the HC-SR04 ranging module produced by our company.

1. This module has stable performance and measures distance. Can be comparable to foreign ultrasonic ranging modules such as SRF05 and SRF02. The high precision of the module, blind spot (25cm), and stable distance measurement are the powerful basis for the successful entry of this product into the market.

ØElectrical performance:

Lead length 2.5M

Weight around 50 grams

ØProduct Features：

1、Small size, easy to use；

2、Low voltage, low power consumption；

3、High measurement accuracy；

4、Strong anti-interference ability；

5、Integrated enclosed waterproof strip probe, suitable for wet and harsh measurement environments。

ØProduct application：

1、Horizontal distance measurement；

2、Obstacle avoidance and automatic control；

3、Object proximity and presence detection

4、Traffic control；

5、Security and industrial control；

6、Artificial Intelligence, Teaching and Research

Basic working principle：

(1)Using IO port TRIG to trigger distance measurement and provide a high-level signal of at least 10us;

(2)The module automatically sends 8 40kHz square waves and detects whether there is a signal return；

(3)There is a signal return, and a high level is output through the IO port ECHO. The duration of the high level is the time from the emission to the return of the ultrasonic wave. Test distance=(high-level time * sound speed (340M/S))/2;

This module is easy to use. If a control port sends a high level of more than 10US, you can wait for the high level output at the receiving port As soon as there is an output, the timer can be turned on to start counting. When this port becomes low, the timer value can be read, which is the time for this distance measurement and the distance can be calculated Such continuous periodic measurements can achieve the values you measure while moving。