DAQHAT doesn't connect after implementation of a second i2c bus on raspberry pi

[aremund]

Hello,

I have troubles with two DAQHATs mcc152.

To read data from to identical temperature sensors I opened a second i2c bus (4 next to 1) on my raspberry pi now with this second i2c bus the daqhats are not responding/connecting anymore. Before everything was working and if I close the second i2c bus, they work again without any  problem. Now I have the question if these daqhats only work with one i2c bus? And if you have any idea how I can use the daqhats with 2 i2c buses?

Thank you already in advance for your help.

[Fausto]

Hello @aremund.

The MCC 152 uses one i2c bus.

Please reference the following post.

 

Regards,

Fausto

[aremund]

Hello Fausto,

Thank you for sending me the other post.

For the second i2c-bus I tried to use the GPIO pins 23/24, 5/6 and 17/27 as far as I can see in the Interface Specifications these pins are not used by the mcc 152.

Nevertheless I get still the same error message:

raise HatError(self._address, "Board not responding.")
daqhats.hats.HatError: Addr 0: Board not responding.

Maybe you can give me another advice.

Best,

Anna

 

[Fausto]

Hello @aremund.

Those pins are used by the MCC 152 and should not be shared with other non-MCC DAQ HATs. Take a look at the pinout chart in the following link. 
 

I don’t have an option for you to use a third party HAT with the MCC 152. 

The links I found point a user to using the RPi pins used by the MCC 152. 

https://www.instructables.com/Raspberry-PI-Multiple-I2c-Devices/

https://pinout.xyz/pinout/i2c

What is the other device you are wanting to use with the RPi module and MCC152?

Regards,

Fausto

[aremund]

Hello Fausto,

As far as I can see the mentioned GPIO pins (23/24, 5/6 and 17/27) should be free to use next to the mcc152 daqhat.

Exactly according to the link I sent, I implemented the second I2C bus.

I try to connect 2 mcc152 and two temperature and RH sensors SHT85.

Best,

Anna

[Fausto]

You don't need to implement the second I2C bus to use a second MCC 152 board.  Please explain why you need to do so.

[aremund]

I need the second I2C bus because in addition to the daq hats I would like to read two temperature and RH sensors SHT85. And I need the second I2C bus because I cannot read the data from two SHT85 sensors from the same I2C bus.

[Fausto]

Hello @aremund.

Which RPi module are you using?

Have you tried using a multiplexor for your SHT85 sensors?  (I found some online articles referencing a multiplexor.)

Are you able to use both SHT85 sensors with the RPi, if the MCC DAQ HATs are not installed?