Posts made by pkourany

@calin, finally figured out you were referring to the command line. Got the updates done but code would still not run on M5Stack. I just updated again and espressif 32 is now v1.02. Everything compiles but I can't test on my M5 until tonight.

@freddyb, I'm having the same problem. how did you "update the platform espressif 32 to version 1.0.1"?

@admin I've given up on the bottom plate with the battery. Without it, the (2018) M5Stack works fine. As soon as I plug it in, the device shuts down unexpectedly, won't reset, won't run without USB power or simply won't power up and boot at all. Sometimes it works for a few minutes but that is the exception and not the rule. I really like the M5Stack but I won't be buying any more. I will try removing the battery from the bottom to see if that is the issue, which I suspect strongly. But then, without a working battery, the M5Stack looks is not so appealing.

@calin, I have seen code for doing a simple I2C sniffer/decoder and possibly one for OneWire. Those would be really useful next to a simple 4-channel logic analyzer with trigger set, sampling rate and small buffer. Suggestions!!! I'm working on it.

@Calin, I REALLY like this project. My M5Stack (2018) is not very happy with the bottom and battery so I will most likely keep it powered via USB most of the time. Having multiple tools available via the menu is fantastic. Some data logging to SD apps would be great, including the meter app. It would also be great to have a simple logic analyzer available. Thanks for your great work! I need to setup a VS environment now ;)

@calin 在 M5Stack 2 Channel Oscilloscope 中说：

he amplitude will be -0.65v to +0.65v (total 3.3v)

@calin, I think you meant the input signal range will be -1.65v to +1.65v (total 3.3v). :)

OMG alll those apps fantastic! Please, please please share that goodness!!!!

I compiled the first example after making the necessary changes doe the M5Stack without errors. However, it would not load onto my M5Stack.

@m5dude, which one was your working hack?

@m5stack, holding the button for programming works fine. Resetting is the issue with my unit. In some cases, even with the bottom plate off, the unit will not reset and run the downloaded firmware unless I let it sit a while. Other times it works fine.

@kentinker, even without the bottom plate the M5Stack has reset problems. I believe this is related to a design flaw in the charger/power control circuit or in the chip itself. I really like the M5Stack but I have yet to see a valid solution to this problem.

As to why my M5Stack doesn’t have a shield around the ESP32, that would be for @m5stack to answer!

@m5dude I have the same problem and I believe it is related to the charger/power control chip used in the M5Stack and the “reset capacitor” issue. New, my 2018 M5Stack seemed to work well but the battery behaved like yours. Then, it wouldn’t reset properly until I put a 0.1uF capacitor between the RST and GND pins on the bottom plate. That worked for a week but now, not only does it not work, even without the bottom plate, I have problems resetting the M5Stack. I believe it is a design flaw in the charger/power control circuit or a flash in the chip used.

@kentinker, the board is the latest with 4MB PSRAM and the MPU9250 or at least that's what I ordered. I am having so many issues with the reset button, the unit is almost unusable!

@M5STACK ???

I am having major issues with my new M5 Core (dated 2017.11) with PSRam and MPU9250. I initially used a 0.1uF cap between GND and RST on the base plate connector which worked well at first but no longer works. Even with the base plate removed, the M5Stack will not reset consistently and often, not at all. I would love to solder a cap to the board, as has been shown in other topics. However, the unit I have has no shield can around the ESP32.

So, does anyone have a similar unit? How does one connect a reset capacitor for this version of hardware?

@jcsbanks 在 Running without battery - power switch 中说：

MPU9250 uses the same pins as Grove I2C, so I think I will not be using that port unless some other 2018 versions do not have MPU9250.

You could use an external I2C GPIO expander like the MCP23017 or SX1509 connected via the Grove connector and still use the MPU9250.

Done!

Purchased from official store on AliExpress.

I tested with a battery connected to the VBAT and GND terminals of the proto module. I now realize the issue is with the charger chip:

• A fully charged battery will boot the unit and it will run for a few seconds and then turn off
• Without any battery, the M5Stack often will not power up when USB is plugged. I need to press the power button several times to get it to power up. Often, that won't even work. The same applies when powered by battery only or battery + USB power.

I now believe I have a defective M5Stack unit. How do I go about getting a replacement?

I have a proto module and will connect a known good 3.7v LiPo to the BATT terminals and try charging and using it. If that dosen't work, I will test battery via JST SH on main board. I have a strong suspicion the charger may not be working.