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Two years ago, someone wanted to display the number of vacancies in a hotel by the roadside ad. He wanted to be able to update this number remotely and that it would be a display (non-standard, the height of the digit 300mm) and that it would be inexpensive.
I suggested updating by sending an SMS. The project was not complicated for me, so it did not take me much time.
Tests:
Short demo video:
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