ماژول فاصله سنج ضدآب AJ-SR04M Ultarsonic

ماژول فاصله سنج ضدآب AJ-SR04M Ultarsonic

Technical Specifications

• Model No: AJ-SR04M
• Operating Voltage: DC 3V to 5.5V
• Quiescent Current: ≤2mA
• Operational Curent: Max 40mA for a short time of operation
• Acoustic Emission Frequency: 40KHz
• Maximum Distance: 8m / 800cm
• Minimum Distance: 20cm
• Dimensions: 41 x 28.5mm
• Sensing Accuracy: ±1cm
• Resolution: about 2mm
• Angle: 75 degrees
• Operating Temperature: -20° ~ 70°C

Pinouts

1. VCC : + 3V to 5.5V (positive power supply)
2. trig(T) : Trigger Input
3. echo(R) : Echo Output
4. GND

Documents and Downloads

• Arduino Example and Library

Application

1, Horizontal distance;
2, obstacle avoidance, automatic control;
3, the object approaches, there is a perceived
4, traffic control;
5, security, industrial control;
6, artificial intelligence, and research

Working principle

(1) using IO port TRIG trigger location, to the high level signal of at least 10us;
(2) module automatically sends 8 40KHz pulses, automatically detecting whether a signal return;
(3) a signal return, a high level is output through the IO port ECHO, the time duration of the high level is ultrasonic from launch to return. The test distance = (high level time * speed of sound (340M/S)) /2;
This module uses the simple method, a control port with a 10µs above high level, can wait for high level output at the receiving port. An output can drive the timer, when this port is low can read the timer value, this time for the location of the time, can be calculated distance. So constantly cycle test, that can achieve the measurement of the value for the distance.