OpenBikeSensorFirmware
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Refuse to write to sd card at low battery level
The PCB-version is capable of measuring the battery level. Below a certain level, the sd card should not be touched any more to avoid corrupted files and cards. 2.4V?
It is more around 3.6V looking at https://blog.ampow.com/lipo-voltage-chart/ - but we need to collect some details how precise the measurements we get are.