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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.
@JumJum
Filesystem is fat32 on a normal Espruino board with micro SD slot.
Tested with 3 boards and 3 SDcards now, always the same.
Next went back some versions, problem started in 1V73.
I'm working on a simple datalogger, reading values from several sensors over days and writing to file in JSON format. Will be used first to collect environmental data from mq-sensors, temperature, humidity, ....There is no big problem doing this with older version.