Thanks for the information, Larry. Does the clock have to be working for the screenshot and s1p, s2p to be saved? Or do I just have to plug in a micro-SD card to get it to work? I guess the saved files could be given a time stamp from the clock instead of naming them. Have you already made these mods to the board yourself? It sounds like the crystal (is it a 32khz clock crystal) is mounted on the board edge rather than tacked onto the MCU as I had been thinking. That would certainly make the mod a lot easier! If you have any pictures or other info that would be useful I would really appreciate it.
Ken, NU4I
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On Mar 24, 2021, at 15:26, Larry Rothman <nlroth@...> wrote:
In DiSlord firmware, the screenshot works if you click on the centre, bottom of the screen.
You can add a 32KHz xtal on the PC14-PC15 pins at the bottom edge of the H4 PCB, then set using the time cmd in the console.
On Wednesday, March 24, 2021, 2:40:46 p.m. EDT, Ken Moorman <nu4i@...> wrote:
Several months ago, possibly last year even, there was some discussion here
about the nanoVNA-H4 as having built onto the boards either a jack that
would accept micro-SD cards or at least the circuit pads were present for
the installation of said jack if it had not actually been soldered on by the
manufacturer. I also remember that there was discussion about adding a
small clock crystal directly across two pins on, I believe, the SMT MCU.
This would allow the user to set the clock using a terminal program like
Putty. Firmware was also being written to support these two features, I
believe. I was too busy with other problems on my learning curve for
nanoVNA use that I didn't save any of the discussions then. I have a
hardware version 4.2 which has the micro-SD card jack already added and have
added a slot to the case for it. I have upgraded the firmware to Dislord's
latest version, v1.0.50, which has the menu item "SD CARD" on the Main Menu.
Tapping on that brings up the next menu with "SAVE S1P" and "SAVE S2P".
There was also something said, I thought, about saving screenshots on the
nanoVNA-H4 to the micro-SD card but I haven't seen a menu item for that yet.
I have not tried plugging in a card yet but when I tap on either of the save
commands nothing seems to happen and I get no error message. If anyone has
discovered how to use any of these functions including the clock I would
really like to learn what you know. And if all this is yet to be
implemented I would like to know that as well. Being able to save the s1p
and s2p files in the field would be a very nice feature, as well as being
able to retain screenshots. I have used my phone to take pictures of the
screen but saving them to the card would be great and wouldn't take any
effort.
Ken, NU4I
