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Use 4 LTC4311 I2C Extender in parallel
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Use 4 LTC4311 I2C Extender in parallel

by expensiveElectronicHere on Sun Dec 05, 2021 6:32 pm

Can I use 4 of thoses modules in parallel(https://www.adafruit.com/product/4756), while using only the one sda wire and one scl i2c wire of an arduino?

I want to use one extender module for each individual sensor, and communicate over 3 meters. Thanks for any help

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Re: Use 4 LTC4311 I2C Extender in parallel

by adafruit_support_mike on Mon Dec 06, 2021 12:43 am

You shouldn't need more than one LTC4311. The photos on the product page show a BME680 connected through a 100' cable, and it worked without any problems.

3m is easy compared to that.

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Re: Use 4 LTC4311 I2C Extender in parallel

by expensiveElectronicHere on Mon Dec 06, 2021 3:14 am

Thanks a lot for answering, but this do not answer my question 100%. I really want one module and one ethernet wire for each sensor. I want to do so with 4 module on parallel on a4 and a5. Can I? Thanks.. Hope you can help me..
Last edited by expensiveElectronicHere on Mon Dec 06, 2021 3:23 am, edited 2 times in total.

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Re: Use 4 LTC4311 I2C Extender in parallel

by expensiveElectronicHere on Mon Dec 06, 2021 3:21 am

I will use each sensor in a different room, that's why I really need 4 modules in parallel on a4 and a5. But I don't know if I can do that

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Re: Use 4 LTC4311 I2C Extender in parallel

by rpiloverbd on Mon Dec 06, 2021 6:37 am

I don't think there will be any problem.

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Re: Use 4 LTC4311 I2C Extender in parallel

by adafruit_support_mike on Tue Dec 07, 2021 10:09 pm

You can put LTC4311s at the end of lines running to different rooms. That won't cause any problems. Given the parasitic inductance and capacitance of the wiring, they won't technically be in parallel.

A single LTC4311 at the microcontroller should probably keep the bus happy too.

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