Let’s start assembling the board that will control the state of the washing machine cycle. Four things are needed: the microcontroller, its power supply (the microcontroller works at 3.3 volts, and the power adapter we’re using works at 5v), the door lock detector and the actuation over the “start washing cycle” button.
As stated above, the ESP-01 needs 3.3 volts to work, a ground connection and needs to have pulled high (using a resistor, like a 10kohm one for example) the GPIO0 and GPIO2 pins in order to boot correctly. Apart from that, an output pin will actuate the start button and an input pin will detect the door lock state.
The 3.3 volts power can be obtained using, for example, an LM317T, a famous classic voltage regulator that, using a couple of resistors allows us to get a specific voltage. Using one of the many online calculators, we can calculate which resistors we need. In my case, I used this one.
