DIY Arduino height measuring machine

When I noticed that my kids were measuring their height every day, I got the idea to make such a device. To find out your height, all you have to do is stand under the device and activate a sound that indicates that your height has been measured.
It is very easy to build and consist only a few components:
-Arduino Nano
-HC SR04 ultrasonic sensor
-LCD display
-Buzzer
-Battery
Now let's explain how it works:
First we need to install the device with the help of double-sided adhesive at a certain height, which is previously defined in the code, and is marked with the letter H on the picture.
When someone stands under the device, the sensor measures the distance D. Next the code calculates the distance H-D which actually represents the height of the person under the device H1 and displays this value on the LCD. Library "LcdBarGraph" helps draw horizontal bargraph , where the length of the bar is proportional to the values provided. When there is no one under the device, the calculated value is zero because in this case H = D and H-D is zero. The device is mounted in a suitable box with the LCD on the front and the ultrasonic sensor on the bottom.
Instructions schematic and code at:

https://www.hackster.io/mircemk/diy-a...

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by mircemk
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