Simple water level project

[Gunner]

@mustafasei

with simple gauge and not in such advanced codes

@mustafasei

I connect the trigger of the HCR-04 to D5 and echo to D5 then the gause on Blynk app to V5

OK, firstly, your choice of sensor is NOT a “simple” one in that it requires particular timing, especially when used with Blynk which has it’s own timing needs.

Secondly, the preference is to NOT use the silk screened Dx pin designations as they do differ between various types of boards.

@mustafasei

#define TRIGGER 4
#define ECHO 5

Your sketch is using the GPIO numbering, so should you when wiring it up.

For the Wemos D1 mini… Google for yours if it is different…

Thirdly, Virtual pins are NOT directly associated with GPIO numbering, they instead refer to similarly labeled Blynk functions, commands and widgets.

http://help.blynk.cc/en/articles/512061-what-is-virtual-pins

And finally… do NOT dump everything into your void loop() when programming with Blynk!

http://help.blynk.cc/en/articles/2091699-keep-your-void-loop-clean

If you do insist on using your ultrasonic sensor to learn with, look at this example and simply disregard the servo if you don’t have one (the gauge widget will still show positioning).

C++ Blynk (Legacy) - Code Examples for Basic Tasks

#16 - Ultrasonic Distance Sensor with Servo This little project used the HC-SR04 Ultrasonic sensor… but instead of boring old distance numbers, it will also position a servo within a range of selected distances. This sketch demonstrates a timer that can be enabled and disabled, so as not to be running something like the Ultrasonic sensor if other critical timing functions need to run. And also demonstrates enabling and disabling the servo, so that there is no jitter or fluttering when it is n…