I have a JSN-SR04 sensor I just purchased that I suspect is bad. Can anyone tell me if it is the same as the HC-SR04 except they are waterproof? I am able to get firmware to work with the HC-SR04 but not the JSN-SR04.

@jstobaugh , it’s possible that the JSN-SR04 needs +5V and gives a +5V output which explains the issue. I recall that the HC-SR04 has two versions and one is not 3v3 compatible. If you have an 5V arduino, you can test it to see if it damaged.

The ports I am using are 5 volt tolerant but it does give me something to look at as the output may be to low.

You might need to power it using 5v/Vin?

What causes you to suspect it’s bad?

They key difference between the two is that the HC-SR04 has both a transmitter and receiver. The JSN-SR04 has a single component that switches between transmitting and receiving. This means it has a dead zone or blind within 25cm of the device because the time required to switch modes.

The readings are random between 20 to 30 cm no matter the distance I have ordered another from a different place to try. The device was shipped with minimal packaging.

You can flash the code Below to know if your sensor is defective. Connect: TRIG to D6 ECHO to D7 5v to VIN Gnd to Gnd. ▶ CODE

Thanks very much. I will give it a try.

JSN-SR04 ultrasonic sensor

General

jstobaugh June 30, 2017, 2:53am 5

I am using the 5 v/Vin but since it is a little lower voltage i am going to supply it with 5 volts and run the trigger Photon output thru a transistor tied to 5 volts and see if that works.

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JSN-SR04 ultrasonic sensor

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