PortA i2c unit not recognized in Core2 when stacked onto Servo2?

swiminthesky

Hi,

I am using ExtIO2 unit with Servo2 stacked beneath Core2, but the Extio2 module is not recognized ("extio Connect Error").
I am using the newest Extio2 library on with extio.begin(&Wire, 32, 33, 0x45) and beginning M5.begin(true,false,true,false,kMBusModeInput). This pins shouldn't be a conflict, as Servo2 is running by default on the internal bus wire1.begin(21,22).

The Extio2 is recognized instantly at portA when used without the Servo2.

Anyone has an idea what could cause this?

felmue

Hello @swiminthesky

I assume you are using an external power supply for the Servo2 module as suggested here. I also assume that the Servo2 module on its own works fine, correct?

Are there any errors in the debug output? Maybe I2C related.

Thanks
Felix

swiminthesky

Thanks Felix @felmue,

external power is used. Servo2 example (on Wire1.begin(21, 22);) also works like a charm.

I used both these M5 i2c scanners I2CScanInternalAndAllPorts and I2C_Tester, but no I2C devices are found.

But after removing Servo2 the device is instantly found correctly!

(Also: I used PaHub on PortA inbetween and Extio2 is also instantly found when Servo2 is not stacked)

(ext power is not used for the picture, the Bottom2 also didn't make a difference afaik)

felmue

Hello @swiminthesky

hmm, not sure what is going on.

Maybe the Servo2 library still uses Wire somewhere internally?

Could it be a mechanical problem?

BTW: my I2CScanInternalAndAllPorts is for M5Paper - I have not tested it on other M5Stack devices.

Thanks
Felix

swiminthesky

Yes, it seems to be a hardware problem! I switched the Servo2 module and everything works perfectly and the i2c connections over port A runs without any interruptions. Thanks Felix @felmue and sorry for bothering!

felmue

Hello @swiminthesky

no worries. Thank you for reporting back. I am glad it now works for you.

Thanks
Felix