Ultrasonic Wave Detector Ranging Module HC-SR04

• 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

Features

• 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

Reference Code: HC-SR04