Like this… but a much smaller eMMC…
And I am not ready to go for non removable media just yet as the on board way of transferring data to the card doesn’t work some of the time. and the sd nand is more easy to corrupt than emmc
I was thinking this as the sd nand is harder to come by. and you are only using 9 of the pins.
there is no difference
emmc and SD is the same thing, emmc just has a faster interface
It seems the reason they are less corruptible is because they are soldered to the board. My point of availability still stands. eMMCs are eazy to find. I like the smaller form factor and simple pin out of the SD nand
What is “SD nand” ?
I don’t normally see these words together. “Nand flash” means something to me, but SD cards are not “nand flash”, because they have a controller that hides the actual inner workings.
And are you saying that the eMMC has a simple pinout, or something else?
According to this page:
Storage Media — ESP-IoT-Solution documentation.
eMMC does not support SPI mode, which is what a standard proffieboad uses to access an SD card. The V3 board has an SDIO controller, and uses that, so it could potentially use eMMC, but the V2 board CPUs do not.
And the data sheet calls it sd flash.
What chip does the v3 use?
And thats super annoying.
First page says “SD nand” though. Guess I should call it that too then. 
STM32L452REI6 if remember correctly.
So is proffie ditching the v3 for a esp32? for the current time frame.
Unfortunately there are road blocks in either direction. For the V3, it’s chip availability, and for the ESP32 there are software problems that needs to be resolved. I intend to keep trying to remove these road blocks, but I don’t know which path will open up first.
BTW what should I do with the vtest pin on the booster if I am going to ditch the booster? I have a lot to learn about the ins and outs.
I am doing the super basic version for the Sonic while I work on the 2 fett slim.
And I cant wait for china to get their act together with the lock downs that are still happening.
The vtest circuit is for checking the battery level and while it’s in the general area of the booster in the circuit diagram, it’s actually a separate circuit.
Question: Why not USB-C on this and newer Proffies?
The USB C ports are bigger than the mircos.
edit forget frying the board part. Not fully awake…
That is not correct. There is no chance of that.
USB-C is bigger, and has some complications because it has so many pins.
I swear I read something about you worring about frying the board with accidental higher watts. Must have been that pin outs comment. Some tired late night reading. lol.
And here is the voltmeter circuit with polarity protection.
Btw have you thought about moving the USB circuit on to a second. and using jst 1mm jack for both USB and as a batt+ and batt- ? I think thats what I will be doing for the sonic boards.
All of that…
1mm JST doesn’t have the current capacity required for BATT-.
Not an issue. Its going to be running a MAX of 8 to 10 Neos Most likely 1 to 4 at most. and if you want to play it safe use the 1.25 jst at 2-3 amps depending on which one. Then again the use case is different with the M2.
BTW what pads are necessary for data logging and trouble shooting. I remember us talking about it. But I cant seem to find it.
@profezzorn btw I saw there was some stock of this chip…
Unless I missed somthing due to my lack of sleep that should work. in the m2…
I know.
I’m getting some m2 prototypes made, so it’s possible this will move forward and become a real thing eventually.
