PID-Controlled Espresso Machine by Gleb Polyakov and Igor Zamlinsky — Kickstarter

How Hong Kong crowdfunders got burned, and why they're still

PID-Controlled Espresso Machine by Gleb Polyakov and Igor

ZPM Espresso and the Rage of the Jilted Crowdfunder - The New York

How Hong Kong crowdfunders got burned, and why they're still

PID-Controlled Espresso Machine by Gleb Polyakov and Igor

ZPM Espresso and the Rage of the Jilted Crowdfunder - The New York

ZPM Espresso and the Rage of the Jilted Crowdfunder - The New York

PID-Controlled Espresso Machine by Gleb Polyakov and Igor

How Hong Kong crowdfunders got burned, and why they're still

Espresso machine using differential, integral and proportional

Arduino-Controlled Espresso Machine Rivals Way More Expensive

Espresso machine using differential, integral and proportional

ZPM Espresso is making an open source home espresso machine

微分・積分・比例制御(PID制御)を用いたエスプレッソマシン - GIGAZINE