#Deal: HC-SR04 sensor ultrasonic distance measurements for Arduino, ESP8266, ESP Easy, Raspberry Pi projects

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The HC-SR04 sensor allows ultrasonic distance measurements between 2 and 450cm. It is a sensor widely used in robotic and RC projects based on Arduino, ESP8266, Raspberry Pi. It is also supported by ESP Easy firmware for ESP8266 WiFi modules.

The HC-SR04 has 4 pins. Two pins for the power supply (+ 5V, GND), a Trig Input pin (trigger input) and an Output pin (or Echo for some manufacturers) of the PWM digital signal. The output will deliver a pulse train proportional to the measured distance.

Technical characteristics of HC-SR04

  • Measuring range: 2 to 450cm
  • Measurement accuracy: 0.3cm
  • Supply voltage: 5V
  • PWM digital output
  • Weight: 9g

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  • All prices mentioned above are in United States dollar.
  • This product is available in AliExpress, Ebay, Banggood, Amazon.com, Gearbest.
  • At aliexpress.com you can purchase Ultrasonic Module HC-SR04 Distance Measuring Transducer Sensor for only $0.85
  • The lowest price of MCIGICM 5pcs Ultrasonic Module HC-SR04 Distance Measuring Transducer Sensor HC SR04 HCSR04 ultrasonic transducer was obtained on 13 December 2018 15 h 03 min.
Specification

Filters

Sensors: Proximity

Output | Relay: 0

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