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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
No, there shouldn't be a problem with unmounting/re-mounting (there may be a little more SD card wear over just leaving the file open and appending to it though).
However it does seem to take a while to re-initialise the SD card (also to open the file), during which time Espruino won't be doing anything else (unless you're able to record using
Waveform, which uses interrupts), so potentially you could lose data during that time.Personally I wouldn't unmount each time because of the above.
One potential fix might be to use the 'card detect' switch. It's not wired up on the Espruino board, but you could solder it to a GPIO pin. You could use
setWatchon it to detect when the card was being ejected and to then close the file, unmount, and stop writing.Whether you can do that quick enough not to cause damage to the SD card, I really don't know I'm afraid.