Help with IoT water flow monitoring schematic

[anon33358962]

@horace

the microcontroller in the schematic is labeled Arduino Nano Every
which microcontroller is it?
post your code?
are you building a PCB?

Thanks for pointing that out, in schematics I used Arduino Nano Every, since KiCad did not have Mini Pro, but the schematics is just for reference.

I’m still prototyping with schematics so I don’t have the code yet.

And I am not building a PCB, just prototyping to learn electronics.

@jremington

F1 is not needed

If short circuit occurs, will this not cut the connection and protect components? Or why it’s not needed?

@jremington

The C1 connection makes no sense at all, and should go from VO to GND.

@jremington

The circuit appears to connect a 5V sensor output with a 3.3V input. A logic level shifter is required. A 1K;2K resistor divider will work.

Does the schematic look better now? Do I need C1 or straight to 3V3 pin?

@jremington

Perhaps the flow sensor will work on 3.3V, in which case drop the boost converter.

It mentions that working voltage for it is 5V~15V (DC). So keep this boost converter?

@PaulRB

Yes, that 5V boost converter will not be as efficient as you are hoping, I suspect. Your schematic labels it as 13uA quiescent current, but I imagine that is when it is disabled and not producing 5V output.

Yes, 13uA is when it’s not supplying 5V, but in my case the device most of the time is idle, so I believe this boost converter is acceptable? I am not sure actually how often the device will be used in regards to the power usage and the choice whether to use boost converter, buck, LDO, whatever. What would you do here to be safer for unknown usage patterns of device? Keep this converter or use a different component?

Thanks for any help.