This Dual-Microcontroller 3D-Printed Lock and Key Triggers MQTT Messages to Log You In

With an ESP8266 in the “lock” and an ATtiny45 in the “key,” you’ll need to figure out the orientation to get this device open.

Pseudonymous maker “Cheats” has found an unusual use for pogo pins: a dual-microcontroller electronic “lock and key” that doubles as a USB security token.

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