Guru
Joined: 13/10/2014
Location: AustraliaPosts: 1768
| Posted: 09:18am 09 Jun 2024 |
For anyone interested in freeing the Nano Micro from the control influences of the USB port.
I have two, not very good photos, of a couple of Nano boards I have.
The Diode removed did the following:
Isolated USB +5V from the Nano board to stop 5V back feed out through the USB port, and it allowed the USB +5v from the PC to feed the Board (Nano) at all times.
Removing the Diode is not a problem, we are using a small programmer board that also powers the Nano during programming via the 6 pin header.
Removing the Reset Cap between the Nano Reset pin and the USB micro / USB port, disables the USB micro and anything on the USB port from resetting the Nano controller (Inverter).
Again, this USB Reset control is not needed when we program the Nano board using the small programmer board.
With these removed and with the automatic removal of the Boot loader when you program the Nano with a programmer board and Hex file - makes for a really robust little board.
The USB port, when connected to a PC or Laptop, is used for setting up the operation parameters of the Inverter via the Setup Menu, it still functions perfectly.
Board 1 with an FT232RL USB controller.
Board 2 with a CH340 USB controller.
The small programmer board in conjunction with the small standalone program handles HEX file uploads and more.
.