Features:

  • The HC-SR04 ultrasonic sensor can send eight 40 kHz and detect whether there is any pulse signal back.If it back, a high level signal will be outputed by IO, and the duration of the signal is the time from sending ultrasonic to returning
  • HC-SR04 Test Distance : high level time velocity of sound (340M/S) /2
  • HC-SR04 Power Supply : 5V DC; Quiescent Current : <2mA,; Effectual Angle: <15° ; Detection Distance : 2cm~500 cm; Resolution : 0.3 cm
  • Equipped with anti-reverse pin socket – making the wiring much tighter and convenient; 4-pin anti-reverse cable also included.
  • Uses the MCU STC15W104 which has a built-in clock, no need of external crystal oscillator.
Great value for the money!

This is a pretty standard part, but there are places where companies could cut corners. HiLetgo did not do that here. These are quality parts that are reliable and simply work as expected. The five-pack is great for when you want to build something that can measure its clearance on all sides or when you want to build more than one project that needs the ultrasonic distance sensor. These sensors are part of a class that I'm teaching, and I know I will not have to worry about hardware issues for my students when they use these parts.

Brilliant value for money

Arrived at the door the day after ordering! No messing about or delays. These sensors are excellent value for money, 5pcs for $9, bubble wrapped for safe shipping. A project was built in around 10 minutes to make use of one, as seen in the attached video. There are plenty of libraries for Arduino use and they work as described. Detection range has been measured up to 10ft for tiny movements. These are sure to end up in robot line follower projects, maybe a mosquito repeller circuit (I so hope so!) and a screen based range finder. They would also suit home security projects.

Works good with an ESP8266 IoT device

I hooked these up with an ESP8266 IoT device in order to measure whether a garage door was open or closed. Works good.

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