I finally have automated my 1.5 Kg electric roaster:
I have been using this roaster for a while, I had to control the air flow and the heating elements on/off by hand.
There is an automated product call WAGO, which allows you to add modules as you need them.
I wrote a program that talks to the ethernet coupler on the wago system. The temperature module reads the bean temperature and sends it back to my program in analog (a whole number). I then take that number and use it as I need it. Either turn on or off the heating elemets.
The SSR (Solid State Relay) (an electronic switch) is to control the 120 Volts connections using a low voltage connection in this case 24V. When I want to turn on the Heating elemts I send a digital signal (1) to turn on the switch to the specific SSR which then alows the 120 V (+pos) to go through. The SSR uses 24V...
This roaster uses a Linux computer connected to the WAGO system which is connected to 3 SSRs that are connected to the Heating elements, fan and drum.
Monito