The famous Logitech Trackman MarbleFX trackball has four buttons, of which the 4th (red) button was used to emulate a scroll wheel. To enable this, the trackball needs to be switched into a special ...

An admin assigns each tenant a prepaid energy quota from a web dashboard. The ESP32 deducts what each tenant uses from their balance. It switches off only that tenant's relay when the balance reaches ...

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