Prismo

Open-source, DIY NFC access controller you build yourself for about $10 to unlock doors.

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Prismo is an open-source NFC/RFID access controller that makers can build themselves for about $10 using an ESP32-C3 and a single-layer, home-etchable PCB. Tapping a registered card triggers a relay to unlock a door or power on a machine, and the device integrates over MQTT with systems like Home Assistant with no cloud dependency. It is aimed at hackerspaces and DIY hobbyists wanting a low-cost, self-hosted access-control device.

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