screws and place the PT100 ring on it with some thermal paste. Unscrew one of the brew thermostats (the one with the red dot on it, see image).

I have used a small candy box (Altoids) to cover the esp32 and the MAX31865 boards.

Ĭonnect the microUSB cable to the charger and pass it through the cables hole to the boiler area.Connect the controller to the power supply - On the Silvia’s CPU unit I have disconnected cables 10 and 2 and instead connected my splitters, one leg of the splitter will connect to the original cable and the second will connect to the USB charger.On this step we are going to connect the temperature sensor as 'read only' mode, to make sure we are getting correct temperature reading from the sensor before letting the new PID to control the boiler status. Also, learning new things and DIY is fun! This was my first microcontroller project. So my controller will use a web UI to control the target temperature. I wanted to keep my machine fully restorable to its original state. Wait, but there are ready-to-use PID controllers online! That’s right, but all the solutions I found online (well, except which are not available) require an ugly controller box outside the machine or cutting holes in the machine’s box. You can do temperature surfing or install a PID controller :-) These temperature variations make it very hard to get a good espresso shot at the right temperature, which has a huge effect on the taste. This means that every time you pour an espresso shot, the temperature will be different. Once turned off, the temperature will continue to climb up to ~114☌ and only then it starts to cool down.

Silvia’s original brew thermostat turns the boiler on at around 90☌ and turns it off around 100☌.

Safety thermostat (cuts the power if the boiler reaches 165☌).

Brew thermostat 100☌ (marked with red dot).

Why would I modify my working espresso machine? I bought my new Silvia E v5 in 2019 and it is still working as new, so why would I modify it? The Silvia has 3 thermostats in it: More mathematical information can be found on Wikipedia. I am going to use the Arduino PID library to control the temperature of my Rancilio Silvia coffee machine. What is a PID controller? A proportional-integral-derivative controller (or just PID controller) is used to regulate speed, temperature, pressure or other process variable with high accuracy and stable results. Make sure to disconnect the machine from the power line before working on it. Any modification to the machine might void the manufacturer warranty. Any modification to it might be fatal to you or your machine, you act at your own risk and responsible for your modification. Warning The Rancilio Silvia machine runs on high voltage.

Pid temperature control labview vi