I have 3 sensors and with all is the same. I test sensor also with Wemos D1 pro and also not working.

The voltage that come from wemos 5v pin is 4.830V, it seams that is not enough for HC-SR04, because if I separate power 5V to ultrasonic it works now.
Is 4.8V realy too low for this sensor? So I must buy HC-SR04+ or P version?

So in settings must be:
- 1st GPIO set to GPIO-13, where Trig is connected.
- 2nd GPIO set to GPIO-12, where Echo is connected.

Is that ok?

My sensor HC-SR04 still not working. I try with sepparate power the ultrasonic, but no luck.
Can you please check my connections and settings, now I power Wemos via USB adapter (5V).

Are this settings for GPIO 12 and 13 are ok, or I must set something?

Thank you Shardan.
If I use separate 5V power for ultrasonic, how I must connect it, then I connect trig and echo pin only to wemos? Where I must connect ground?

Thank you

Yes I already use two resistors for GPIO12.
I power D1 via USB connector (USB powerbank), ultrasonic sensor VCC pin is connected to D1 5V pin, is this ok or not?

It is not + version.
Now I power it from USB port, so what is yours suggestions, how I must power it?

Now I finaly connect my wemos d1 mini to ultrasonic HC-SR04, but it was not reading distance.
in log I see: 523491 : SR04 : Distance: SR04 : Distance: No reading!

In GPIO-12 I connect Trig, in GPIO-13 I connect Echo

Now it is working...first I connect device to android hotspot, then I change wifi settings on esp web to Mikrotik wifi and it works. Thank you

Today I flash my new Wemos D1 mini with ESP Easy R120 version. I can connect to ESP_0 network and i can select my network and type the password, but then device not connect to my wifi network.
I use Mikrotik for my wifi AP, when I test with my Android hotspot it works. What can be a problem?

Thank you for your recommendations. I will put beam antennas on both side. What are the experiences with such antennas on wemos side? And I need antenna with RP-SMA connector and another connector to wemos, and I read that must move one chip to external pin, is that right? Yes, I know that long wire...

Thanks you Shardan. Yes the HC-SR04+ is similar, only difference is that only need 3.3V, so I probably can connect it to 3.3V pin and than not need any resistors? Is possible that I power sensor from external supply, so then I will put on wemos only triger and echo pins?? I am looking for water syst...

Hi,

I need help for what is the best practices to connect HC-SR04+ to wemos d1 mini pro? Do you have some connection schema?

And is it posible to power ultrasonic sensor separatly and only connect Trig and Echo pins to wemos?

Thank you,
BR