HC-SR04 Ultrasonic Proximity Sensor R2

(14 customer reviews)



Reliable, high performance, high accuracy, blind area within 2cm

  • Voltage:DC 3.3 – 5V (R2 version now is 3.3V-5V compatible)
  • Current:less 2mA
  • Sensing angle:Less than 15 degree
  • Sensing distance:
    • 2cm-450cm for 5V
    • 2cm-400cm for 3.3V
  • Accuracy:about 0.3cm
  • PCB Dimension:4.5*2.0CM
  • Connection:  VCC, trig(Control),   echo(Receive), Out, GND
Working principle:
  • Send high TTL signal at trigger IO.
  • Module automatically send 8*40khz squre wave in order to detect if there are any signal return.
  • when signal return, use each(receive) IO pin output high TTL, the output TTL time length is the time from sending till return.
    • try to use this fomula: distance = (high TTL time* velocity of sound)/2
    • velocity of sound = 340m/s

Buck order price 17% discount for 50pcs, auto update price in cart.

Documentation: See more at this wiki page.

Additional information

Weight 0.008 kg

14 reviews for HC-SR04 Ultrasonic Proximity Sensor R2

  1. Harry

    Good, stable and accurate ultrasonic sensor. Needed it for switching on/off a project if someone was in a range of 0 to 30 centimetres. Works like a charm. And like all the stuff you can find here, the price is unbeatable.

  2. Sachin (verified owner)

    Nice product! These sensors are capable of measuring up to a range of 4 mts or more. Good quality product at affordable price.

  3. koursaros (verified owner)

    Nice sensor
    good price

  4. snapper101

    This is a very good sensor that is good for starting robotics people allowing them to develop robots that can sense its surroundings.

  5. schnetzi (verified owner)

    Very good price, good quality and works very well 🙂

  6. dancewicz.grzegorz (verified owner)

    Really good one, I used it to support my wife with car park in our garage – blinks the Red/Yellow/Green LED depending on distance to the wall left. Of course great price!

  7. snapper101

    This is a very good sensor that can be used for a lot of robotics purposes. Its sensing distance is not that far, but good for smaller robotics projects, google for the biped robot “BOB” the biped. It’s a very simple robot that can be built with the micro servos available here and also this sensor.

  8. yfands (verified owner)

    Well Build and cheap, if you’re using an Arduino, try this library
    I was able to measure within 2 – 273 centimeters.

  9. cromdeveloper (verified owner)

    Good, stable and accurate ultrasonic sensor

  10. jpoilux (verified owner)

    Works like a charm.
    Very good product!

  11. alexbunodiere (verified owner)

    Great product,very easy to use

  12. Christoph (verified owner)

    The classic HC-SR04. Robust, reliable and accurate. I use one to measure the water level in my cistern.

  13. geraldhasmail (verified owner)

    Excellent! Very easy to set up with Arduino, great for measuring the height of fluid in a tank if you don’t want to get a sensor wet.

  14. adrien.sortais28

    Must have in any project !

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