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HCSR04 Datasheet(PDF) 2 Page - List of Unclassifed Manufacturers

Part # HCSR04
Description  Ultrasonic Sensor
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Manufacturer  ETC2 [List of Unclassifed Manufacturers]
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HCSR04 Datasheet(HTML) 2 Page - List of Unclassifed Manufacturers

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detect an object also depends on the objects orientation to the sensor. If an object doesn’t 
present a flat surface to the sensor then it is possible the sound wave will bounce off the 
object in a way that it does not return to the sensor. 
 
 
2. HC­SR04 Specifications 
The sensor chosen for the Firefighting Drone Project was the HC­SR04. This 
section contains the specifications and why they are important to the sensor module. The 
sensor modules requirements are as follows. 
● Cost 
● Weight 
● Community of hobbyists and support 
● Accuracy of object detection 
● Probability of working in a smoky environment 
● Ease of use 
The HC­SR04 Specifications are listed below. These specifications are from the 
Cytron Technologies HC­SR04 User’s Manual (source 1).  
 
● Power Supply: +5V DC 
● Quiescent Current: <2mA 
● Working current: 15mA 
● Effectual Angle: <15º 
● Ranging Distance: 2­400 cm 
● Resolution: 0.3 cm 
● Measuring Angle: 30º 
● Trigger Input Pulse width: 10uS 
● Dimension: 45mm x 20mm x 15mm 
● Weight: approx. 10 g 
 
The HC­SR04’s best selling point is its price; it can be purchased at around $2 per 
unit. 
 


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