On Thursday, September 24, 2020, 1:16:42 p.m. EDT, Jerry Gaffke via groups.io <jgaffke@...> wrote:
I've got an SD card socket from a failing chromebook,
intend to transplant it to my nanovna-H4 someday soon.
And I really like the addition of a simple TTL UART to these devices.
Both much appreciated.
But thought I would speak up and say a bigger processor might not be a bad idea someday.
Here's what Mouser has in ST ARM processors in LQFP48 and LQFP64 with 128kbytes or more of RAM, sorted by price.
Note that the first one listed is an STM32F series part, $3 in quantity from Mouser, has 128k of RAM.
Unfortunately, it's in the LQFP64 package, so not an easy plug-in for an existing board.
There are some 128kbyte RAM parts in the LQFP48 package, they are all of the STM32G family and have a slightly different pin-out than their STM32F brethern.
But the pin-out change is slight enough that a motivated hobbyist with a binocular microscope could shoehorn it into an existing board.
They start at $5:
On the other hand, being able to sell a nanovna for $40 means a huge potential customer base.
And bifurcating board production and firmware requirements into yet more permuations is not necessarily a win.
Not my call, but a bigger processor could make lots of things easier
Jerry, KE7ER
On Thu, Sep 24, 2020 at 09:50 AM, DiSlord wrote:
NanoVNA H and H4 have SD card support for store s1p/s2p files and screenshots
If use external software (like NanoVNA-App) you can save on CPU every measure
(see screenshots)
You can use Bluetooth (or WiFi to TTL) module for wireless accsess to nanoVNA
of exist difficults vs wires
