Hello everyone, I’m designing my own version of the irrigation controller, and I’ll make changes to be programmed manually without going online, because the installed place is very remote and has no access to the web.
I will use one ATMEGA328 that works perfectly to 5V, but the ENC28J60 that requires 3.3v will not be incorporated into the PCB, it will be an optional module with its own 3.3V regulator.
Other basic components (DS1307, LCD16x2, 74HC595) all operate with 5V too.
It is possible to run the entire PCB with 5V and NOT use the linear regulator 3.3v?
This is the schematic from my power Supply (without the 3.3v linear regulator)