For making the cows look like being on a stage, it is necessary to build a proper stage with curtains.
Curtain:
It turned out to be a problem finding the most appropriate fabric, so I found red tinsel instead. It looks quite striking and provides a festive touch. However, I have to be very careful when making holes in it, so it does not tear apart. Making the holes large enough to give room for the thread to get through smoothly, turns out to be quite a challenge. If it was some fabric with larger holes, moving the curtain along the string would be far more easy.
The stage itself is a shoe box. It is stout and has enough space for the Arduino and all electronics. The box should be large enough to support the three cows and to hold the curtain. I am painting the box in a friendly grass-green. Holes need to be cut out of the box, so the ping sensor can reach through the box. Flowers will be painted on the surface to hide the sensor.
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