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Hi Cor, Found a solution; the 64 GB card was formatted exfat. Reformatting it as fat32 made the directory, and its contents visible. This is what PLAY looked like with the 64 GB XC I card (Exfat): Greetings, Fred Jan

Yes that is useful extra information. The 8GB is a HC I, the 64 GB a XC I. Greetings, Fred Jan

SD card differences? While testing the TeensyBat with the latest firmware 1.2, I found not all SD-cards are created equal; a new 64GByte SanDisk Ultra wouldn't show the directories (writing did work), and an older 8GByte Kingston (formatted to fat32) did show directories, but seemed 'noisier'...

Hi Cor, The 3D printed files are here: https://www.prusaprinters.org/prints/75049-teensybat-box and https://www.thingiverse.com/thing:4946124. Greetings, Fred Jan

Reporting success! Hi All, Just a short mail to say thank you for this very cool project and report that my TeensyBat seems to be working ok. Originally I planned to use the standard box, but designing and printing a custom box would look much better (than drilling holes with my sub-optimal...

Thanks for the responses. I already tried the solution with micros(). The elapsedMicros solution didn't work well as it can't be combined with volatile. Without volatile the variable is updated only one in ten iterations. Timer Input Capture sounds good as most is done in hardware. I didn't...

Hi All, Is there a library, function or code sample to measure intervals in the single micro-second range? It might be my search terms, but I end up with code for producing fixed intervals. I managed to detect the interval boundaries with attachInterrupt(pin, function, CHANGE), but apparently...