Let's Control It

I have a problem with the ultrasonic sensor JSN-SR04T: It should measure the water level in a cistern. Basically, that works very well. The values are delivered cleanly to my server every 60 seconds. However, the value freezes again and again if it measures the same or a similar distance longer. He then stays e.g. hang at 21 cm and the value changes only when I take it out of the cistern and e. change to 40 cm. Does anyone have an idea what it can be? I have the sensor with the parameters "Position - HC-SR04, RCW-0001, etc." integrated via ESpeasy.

I have the same problem.
Software: ESP Easy Mega, Git Build: mega-20211224_f162ebf
Controller: ESP-01S
Sensor: JSN-SR04T / AJ-SR04M
Could you solve the problem?

kind regards
Markus

Hello Markus,

did you solve your problem? I'm wondering, there is a difference between the sensor in the device list HS-SR04 to your sensor JSN-SR04T? Did you also note that the output signal of the sensor is 5V and you have to reduce it to 3,3V?

Regards

Ingo

Hi,

Try this simple solution

Andrzej

Hello Andrzej,

good idea! How did you connect the JSN-SR04T to the ESP? Did you use any converter for the Signal for 5V to 3,3V?

Thanks and best Regards!

The documentation for P013 has a link to the Level-converter page that actually has the schematics for wiring up a HC-SR04 ultrasonic sensor...

I have been using the JSN-SR04T (waterproof version) with a 3.3V supply voltage for several years now. It should actually work with 3-5V.

As usual with some devices, 'it depends'. The HC-SR01 I have here won't properly work with 3.3V..., so, YMMV

bastler11 wrote: ↑09 Jan 2024, 12:26 Hello Andrzej,

good idea! How did you connect the JSN-SR04T to the ESP? Did you use any converter for the Signal for 5V to 3,3V?

Thanks and best Regards!

Hi,

Whole "system" powered from one 3.2V 26650 LiFePO4 akku.

Andrzej