Project Coffee: Es(pi)resso Machine
Video summary
A Raspberry Pi was integrated into a Gaggia Classic espresso machine to improve temperature stability and add features: PID boiler control via an SSR and PWM, digital temperature sensing (DS18B20 then TSIC306), pump control with SSR/IGBT for PWM pressure modulation, flow sensing for measured shots, ultrasonic water-level sensing, and an LCD touch display. Software uses PIGPIO and C++ threads; data logging and network access via Samba. Hardware and safety cautions are emphasized.
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