I’m trying to build my own coffee machine. As I’m a computer science student my knowledge of electrical engineering / components is very limited.
I want to start with the water supply first and designed a schematic in order to control the water pump and heat element. I was planning to use a nodemcu microcontroller to control the whole thing. i use the temperature controller to know how hot the heating block is and to turn it off. when it reaches 70°C i get an input signal at D3 pin of the nodemcu and turn off the relais.
in the attachment i put the schematic i designed. of course the 5v relais are connected to the 5v power supply. from another project i know that the 3,3v output from the nodemcu is enough to trigger the 5v relais.
i would be very glad if someone could give me an opinion/improvements about this.
im using the following parts:
Ulka Model EFM Type EP5FMGW/SP 230V 50Hz 48W 2/1min. Cl155 Tf35°
12V AC/DC Converter:
temperatur controller (W1209):
Gescannte Dokumente.pdf (568 KB)