User Guide. HC-SR04 Datasheet

HC-SR04 Guide. Datasheet pdf. Equivalent

HC-SR04 Datasheet
Recommendation HC-SR04 Datasheet
Part HC-SR04
Description Ultrasonic Sensor User Guide
Feature HC-SR04; HC-SR04 User Guide 1. Ultrasonic Distance Measurement Principles The transmitter emits a 8 bursts of.
Manufacture ETC 1
Datasheet
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ETC 1 HC-SR04
HC-SR04 User Guide
1. Ultrasonic Distance Measurement Principles
The transmitter emits a 8 bursts of an directional 40KHz ultrasonic wave when
triggered and starts a timer. Ultrasonic pulses travel outward until they encounter
an object, The object causes the the wave to be reflected back towards the unit.
The ultrasonic receiver would detect the reflected wave and stop the stop timer.
The velocity of the ultrasonic burst is 340m/sec. in air. Based on the number of
counts by the timer, the distance can be calculated between the object and
transmitter The TRD Measurement formula is expressed as: D = C X T which is
know as the time/rate/distance measurement formula where D is the measured
distance, and R is the propagation velocity (Rate) in air (speed of sound) and T
represents time. In this application T is devided by 2 as T is double the time
value from transmitter to object back to receiver.
2. Product Features
Features
Stable performance (Xtal.)
Accurate distance measurement
High-density SMD Board
Close Range (2cm)
Uses
Robotics barrier
Object distance measurement
Level detection
Security systems
Vehicle detection/avoidance
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ETC 1 HC-SR04
3. Product Views
FRONT
BACK
14
41
4. Module Pin Asignments
Pin Symbol
1 VCC
2 Trig
3 Echo
4 GND
Pin Function Description
5V power supply
Trigger Input pin
Receiver Output pin
Power ground
5. Electrical Specifications
WARARNING
Do Not connect Module with Power Applied! Always apply power after connecting
Connect "GND" Terminal first
Electrical Parameters
Operating Voltage
Operating Current
Operating Frequency
Max. Range
Nearest Range
Measuring Angle
Input Trigger Signal
Output Echo Signal
Board Dimensions
Board Connections
HC-SR04 Ultrasonic Module
5VDC
15mA
40KHz
4m
2cm
15 Degrees
10us min. TTL pulse
TTL level signal, proportional to
distance
1-13/16" X 13/16" X 5/8"
4 X 0.1" Pitch Right Angle Header Pins
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ETC 1 HC-SR04
6. Module Operation
Set Trig and Echo Low to initalize module. Place a minimum 10us High
level pulse to "Trigger" (module will automatically send eight 40KHz acoustic
bursts). At the same time, Gate the microcontroller timer to start timing.
Wait to capture the rising edge output of ECHO port to stop the timer. Now
read the time of the counter, which is the ultrasonic propagation time in the air.
According to the formula: Distance = (ECHO high level time X ultrasonic
velocity (Speed of Sound in air 340m/sec) / 2, you can calculate the distance to
the obstacle.
For best results and maximum range, the Object should be larger than 0.5M2
the nearer the target object, the smaller it may be
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