coffee.js? How I hacked my coffee machine
summary
A hacked Nespresso control panel becomes a JavaScript-controlled API: eight cable pins mapped (three power pins, three LED pins, two shared button lines), 3.3V fails so 5V powers LEDs, and two LEDs get burned during testing. Tools are Johnny-Five on a Tessel 2, jumper wires, multimeter and four relays on a breadboard. Code simulates short button presses, exposes an HTTP endpoint implementing parts of HTCPCP (brew/POST), uses localtunnel for access, and still needs a sensor to confirm brew state.
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