Look at an ESP32 based solution
There are small ones like the Xiao
You can also find ready made products in the shape of a watch (lilygo t-watch)
This is the chip used on the original Nano. However, @contiko_ua is using a derivative board, which uses the lower cost WCH CH340 instead of the FTDI FT232R:
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Exactly. It's also visible in the photo:
Note the WCH logo at the bottom of the IC. The variant used on these Nano clones is the CH340C or CH340B AFAIK.
Note that CH340G/T will NOT work unless a 12MHz ceramic oscillator is also mounted on the pads connecting to pins 7 & 8.
oh, yeah, yours is a clone...
you can get the CH340, if it was used on the board, which you said it was, so it should be fine.
Just get the right version. See #23.
YMMV. But the soldering isn't for beginners, and if you solder it up, then it doesn't work, what have you gained? You can buy Nanos, pre soldered or not, for peanuts in sets of 5 or 10. By the time you locate a part, order and wait or drive and purchase, remove old device, solder in new one, test, and fail/pass, was it worth it?
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You can use an Arduino to program it through the serial pins or through the 6 pin header (ICSP or ISCP, forgetting right now) and there is alternate of using an FTDI cable.
This is Nick Gammon's tutorial on making your own Duino on a breadboard. The ways you would program that can be used on a Mini or really any Arduino board. There is serial or the 6 pin header. if you have questions, refer to this tutorial.
Making your own minimal duino by Nick Gammon.
it's the "CH340", I hope there is no problems, and I hope your board works!
contiko_ua is close to making stand-alone products on his own PCB's. The Mini is like a sub-assembly even more than the Nano.
The Uno is a dev board. The AVR on it is socketed for removal and the main site docs were clear about the path to stand-alone end products. The Playground is where I first saw the words Minty Boost Process that Adafruit still refers to. The Arduino system was simpler 20+ years ago.
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