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Some more follow up: I had also skimped some on bulk capacitance. Bringing those up to the values recommended by NXP helped bring down current draw. Also using larger packages for the larger capacitances probably helps. It’s also important to...

I found this from the NXP Hardware Development Guide: The recommended value for the external inductor is about 4.7u~10uH ，saturation current >1A，ESR < 0.2Ohm;

It looks like it's the 4.7uH inductor (L1). I used a Murata LQM18PH4R7MFRL to keep the size down as much as possible, but it must have too much series resistance (0.44 ohms). I had an EPCOS T1472K on hand which is a bigger part and half the...

I made the changes and added the MTP stuff in. I selected 'Serial + MTP' as I need both. Had a small glitch on compiling as it looks like MTP grabs some of RAM2, which I use as a secondary buffer when logging. I just reduced my buffer size a bit...

Thanks Joe, Looks real straightforward. I was totally misunderstanding that SDFat was the best to use. I’ll try it out. Today I just loaded MTP after each run to get the data file. Clumsy, but so much better than moving the SD card.

Ok, so (and sorry for my naivety), in general, I should be using SD instead of SDfat?

I appreciate the feedback, thanks! I was thinking, 'too bad' in that it doesn't integrate directly into my code. I'm probably out of touch on this. I based my logger on the 'bench.ino' example, as I need large files and fast SD writes (I'm...

Ah, ok., thanks Paul. Too bad. My backup plan was to just read the file and send it over USB-serial and capture that to a file. Not elegant , but functional. In any case, kudos for all the clever additions to Teensyduino. It’s humbling when I...

Oh, this is cool. I got the example running, but I also need a serial USB interface. I wasn't sure they could co-exist, but if I do: void loop() { MTP.loop(); // Perform media access when PC wants access if( Serial.available()) {...