It is quite easy to display any kind of indicator about power state on screen, small (or large) icon, text, etc...

loboris
@loboris
Posts made by loboris
-
RE: [M5Paper] - optional LED indicating ESP32 is powered or not
-
RE: M5Paper Light on?
This device has an ePaper display which reflects the light and is readable similarly to the ordinary paper. You will be able to read it in the lighting conditions in which you can read the paper book.
Just turn the light on.
Some (rare) ePaper displays have the frontlight module on top of the display, like this one, but M5Paper does not have such a module. -
RE: M5Paper power management
In case of ESP32 you can measure power consumption with practically any multimeter in uA range.
If the current is < 5-10 uA you have an excelent low power device.
You will rarely need the information about power consumption in sub uA range and investing any amount in a device for measuring current of ESP32 deep sleep mode is probably waste of money (unless you need it for other measurements, of course). -
RE: M5Paper schematic
I think it could be also usefull to make available some IT8951 documentation. It is hard to find and could be very usefull for developers.
Data sheet
USB Programming Guide, also relevant for SPI programming.
SPI Programming Guide -
RE: M5Paper schematic
@zontex said in M5Paper schematic:
@loboris Yup, quick update that after I've made the comment we've discussed and decided to release all schematics as too many of you guys requested it ! all schematics now published in our documentation.
It was a wise decision.
-
RE: M5Paper schematic
@macias said in M5Paper schematic:
Hello,
Where I can find complete schematic for M5Paper?
I saw it after device was released but now only useless image is available as a schematic. (https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/schematic/Core/m5paper/M5_PAPER_SCH.pdf)
If anyone has a complete schematic please share it.Thanks
For me this link works and schematic pdf is returned.
In case anyone have a problem downloading it, you can get it here: https://loboris.eu/ESP32/M5Paper_schematic.pdf -
RE: M5Paper
hier kannst Du sie bestellen !! "https://eckstein-shop.de/M5Stack"
eckstein-shop.de: Delivery time : approx. 61 - 63 days
Still 8 in stock for immediate dispatch at Distrelec.
-
RE: M5Paper power management
@felmue said in M5Paper power management:
Hello @loboris
if I read the schematics correctly in power off mode signal
PS_ON
is low,FET2
open,PWR_EN
pulled up byR35
,FET1
open,VBAT
zero andVSYS
zero as well, therefore the values of R30 and R33 shouldn't matter since SY7088 is without power. Or am I missing something?BTW: The RTC will drain the battery even lower as it is directly connected to the battery and runs until 1 volts.
Thanks
FelixThank you, I've missed that.
RTC current is <1uA, so it should not be a problem. -
RE: M5Paper
It would be nice if I had it too. Unfortunately I can't find a supplier in Germany who delivers it.
Distrelec has 17 left in stock. I've received mine in less than 18 hours (Netherlands -> Croatia)
-
M5Paper power management
There is a potential issue with M5Paper power management.
SY7088 boost regulator is used to generate a stable 5V voltage used used for all other voltages.
When the system is in power save and power off modes, resistors R30 & R33 values causes the constant current consumption of ~254 uA which leads to quite rapid battery discharge. At least 10x higher values should be selected. From Data sheet:it is desirable to choose large resistance values for both R30 and R33 . A value of between 10kΩ and 1MΩ is recommended for both resistors.
Furthermore, SY7088 shuts off the output only at ~2.3V which couses battery overdischarge!