M5station485 factory installed program

felmue

sorry to hear about your troubles.

I've just double-checked the Arduino INA3221.ino example and it works for me. I do see current values different from zero when plugging something into one of the 6 groove ports.

Do you have a multimeter? If yes, could you check if there is voltage (5 V) present?

You also might want to re-install M5Station library - sometimes M5Stack engineers fix a bug, but do not change the version number.

Thanks
Felix

Ricky_M5Station

Hello Felix,

I tried the INA3221.ino example again after upgrading to Arduino 2.0.3 and removing and reinstalling the M5station libraries. Unfortunately the result is still the same 0V and 0ma for all ports. I've connected a RS485 module to one of these ports and the light on the module is on so I suppose power is there. Also with the factory installed program voltage and current values can be seen for that port.

That said, the factory installed program has very different power management codes for reading the values, I wonder if that has to do with it.

Thanks,

Ricky

felmue

Hello @Ricky_M5Station

hmm, not sure what's going wrong here.

Have you checked the log output? Maybe there is a hint in there.

BTW: my best guess for the factory code being different from the example code is two different M5Stack engineers probably created those.

Thanks
Felix

Ricky_M5Station

Hello @felmue

What do you mean by the log output? The serial monitor?

Just to make sure: you said the example is working on your hardware. Did you also use M5station-485?

Thanks again!

Ricky

felmue

Hello @Ricky_M5Station

yes, I mean the serial monitor. And yes, I was testing the example with a M5Station-485.

Thanks
Felix

Ricky_M5Station

Hi @felmue,

When I opened the example, no board was chosen. Is this also true on yours? What board did you choose? The M5station? Just to make sure we are on the same page. Maybe I should also post the code here to compare.

Thanks,

Ricky

felmue

Hello @Ricky_M5Station

I've selected M5Stack-Station in Arduino IDE 2.0.3.

Try changing Wire to Wire1 in M5Station.cpp:

    INA1.begin(&Wire1);
    INA1.reset();
    INA1.setShuntRes(10, 10, 10);
    INA2.begin(&Wire1, INA3221_ADDR41_VCC);
    INA2.reset();
    INA2.setShuntRes(10, 10, 10);

Explanation: Wire1 is used internally, Wire is used for ports A1 and A2.

Thanks
Felix

Ricky_M5Station

@felmue Hi Felix,

That works!! Thanks! But can you please explain a little bit about Wire? I thought it's only the i2C interface handle.

Thanks again!

Ricky

Ricky_M5Station

@felmue Hi Felix,

I see what you meant now. Wire(Pin 32,33) are brought out to A1 and A2, all the internal chips use Wire1(pin 21 and 22) for their I2C. So "Wire" is not the correct I2C to use. Thus the example has a bug. Need to trace the libraries to find out. A manual is badly needed :).

Thanks!

Ricky

felmue

Hi @Ricky_M5Station

thank you for confirming the fix works.

I've created a PR to fix the issue.

Thanks
Felix