CoffeePID - a generic PID controller for coffee machines — 1024kilobyte
Smart Heater Contoller for an ESPresso machine | LW Project Blog
PID Retrofit KIT for Gaggia Classic Pro & Classic & Home PID Temperature Control Retrofit KIT for Rancilio Silvia Espresso Machine [KIT-GG] - $149.50 : Auber Instruments, Inc., Temperature control solutions for
Coffee Machine Kits : Auber Instruments, Inc., Temperature control solutions for home and industry
PID Controlled Thermostat Using ESP32 (Applied to a Rancilio Silvia Coffee Machine) : 6 Steps (with Pictures) - Instructables
Ramp & Soak PID Programmable Controller can be programmed for multiple profiles
Wi-Fi 1/16 DIN PID Temperature Controller (For SSR) [AW-SYL-2352] - $99.99 : Auber Instruments, Inc., Temperature control solutions for home and industry
DIY Rancilio Silvia wifi-enabled PID : r/espresso
WIFI Electric Smoker Temperature Controller, 3 Probes, 1800 Watts 701098739611 | eBay
PID Control Kit for Rancilio Silvia Espresso Machine, White LED 701098739574 | eBay
DIY Rancilio Silvia wifi-enabled PID : r/espresso
My WIP $25 PID mod wifi enabled and universal : r/espresso