Ultrasonic HC-SR04 DISTANCE Measuring module TRANSDUCER SENSOR for ARDUINO, AVR

Description Ultrasonic HC-SR04 DISTANCE Measuring module TRANSDUCER SENSOR for ARDUINO, AVR The HC-SR04 ultrasonic sensor uses sonar to determine distance to an object – just like bats or dolphins do. This module offers excellent range accuracy and stable readings in an easy-to-use package. It operation is not affected by sunlight or black material (although acoustically soft materials like cloth can be difficult to detect). Similar in performance to the SRF005 but with the low-price of a Sharp infrared sensor. Perfect for collision avoidance on your next robotics or multirotor project! Module main technical parameters: 1.Working Voltage : 5V(DC) 2.Static current: Less than 2mA. 3.Output signal: Electric frequency signal, high level 5V, low level 0V. 4.Sensor angle: Not more than 15 degrees. 5.Detection distance: 2cm-450cm. 6.High precision: Up to 0.3cm  7.Input trigger signal: 10us TTL impulse 8.Echo signal : output TTL PWL signal Mode of connection: 1.VCC 2.trig(T) 3.echo(R) 4.GND Use method: Supply module with 5V, the output will be 5V while obstacle in range, or 0V if not.The out pin  of this module is used as a switching output when anti-theft module, and without the feet when  ranging modules. Note : the module should be inserted in the circuit before been power, which avoid producing high level of misoperation;if not, then power again.  Module Working Principle:  1.Adopt IO trigger through supplying at least 10us sequence of high level signal. 2.The module automatically send eight 40khz square wave and automatically detect whether receive  the returning pulse signal. 3.If there is signals returning, through outputting high level and the time of high level  continuing is the time of that from the ultrasonic transmitting to receiving. Test distance =  (high level time * sound velocity (340M/S) / 2. Note : This module is not suitable to connect with electric power, if you need to connect this  module with electronic power,then let the GND terminal of this module to be connected  first,otherwise, it will affect the normal work of the module Working Voltage : 5V(DC) Static current: Less than 2mA. Output signal : Electric frequency signal, high level 5V, low level 0V. Sensor angle : Not more than 15 degrees. Detection distance : 2cm-450cm. High precision : Up to 2mm Input trigger signal : 10us TTL impulse Echo signal : output TTL PWL signal The basic operation principle is below : use IO port TRIG to trigger ranging. It needs 10 us high level signal at least Module will send eight 40kHz square wave automatically, and will test if there is any signal returned. If there is signal returned, output will be high level signal via IO port ECHO. The duration of the high level signal is the time from transmitter to receiving with the ultrasonic. Testing distance = duration of high level*sound velocity(340m/s) / 2 You can use the above calculation to find the distance between the obstacle and the ultrasonic module. NOTE : The module has a blind spot of 2cm(very near). So obstacle held too closely will not be detected.