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Replying to @guidoism, @bigattichouse, @Bfreecomputers and @adafruit

If someone with a better grasp of the math wants to play with it, I found a data sheet for what I think is the module in that teardown. The promise is between 120 and 210 microjoules at 2 volts, when you press it with between 2.7 and 3.9 newtons of force. https://www.enocean.com/wp-content/uploads/downloads-produkte/en/products/enocean_modules/eco-200/data-sheet-pdf/ECO_200_Data_Sheet_June2021.pdf

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