The meager instructions that came with this (at least when I purchased it back in 2017) are pretty useless and incorrect. If you dig around online or look at the Amazon reviews you can find the correct instructions to get it to work. Basically, you have to check the l2C address (which is wrong in the instructions), check that you are using the correct l2C address, if your Arduino has more than one, and make sure you are giving it 5V of power. Once you get it working, it works as it should. I used it for a build for an independent study project, and once I got everything set up correctly, it worked as expected to display a message based on the amount of vibration detected from a piezoelectric sensor.
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