MicroPython Forum (Archive)

Wow - that's confusing. On the older boards, VBACK used to be called VBAT. VIN/VUSB/VBAT should all be alternate power sources for the onboard regulator. The 3V3 pin is powered from that regulator. Maybe that's why i wire wrong :roll:, i've gathered information in posts but i was not paying attenti...

i can't see nothing wrong :cry: I can. The RTC backup battery should be connected between vbak and gnd. The terminals you're using are for a LiPo battery. See https://micropython.org/static/store/img/products/PYBv1_1-E.jpg :oops: my bad! i correct the wiring and it's working now :mrgreen: thank you...

@saulo With a battery providing 3V or thereabouts to vback and no power applied to V+ the LED's should not be on. I'd suggest checking your wiring. Take a look pythoncoder: leds_on.jpg wiring.jpg i can't see nothing wrong :cry: RTC works fine without battery, but i have to update datetime every tim...

What is the output of rtc.info()? After a full power cycle, including Vbat. Best to leave the board un-powered for a reasonable amount of time (1..2 minutes). I have the same problem... i put a coil battery on vbat for five minutes and all leds turn on very weaks.. after that, i connected usb and t...

Thank you guys, now i got it! In short terms: pyboard have some "stream limitations" to files manipulation from buffer to storage that the mounting process from host don't see, right? I assume that will happens on *nix system as well, right? I will emulate the file behavior with a UART port, so i ju...

Hi guys, i'm doing a telemetry hardware for some testing and i also want to make a data acquisition, just to ensure i will have all data.. can someone please explain how the sdcard writing file works? if i open a file on REPL, why the file is not created :?: but if i put on main.py some file manipul...