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AHT10 - I2C problem

msimon

I just bought AHT10 humidity and temperature sensor. I have seen that it supports I2C and it is cheap so I didn't think thoroughly and bought two. I wanted to try them then I encounter a problem that only a single AHT10 can be connected to single I2C bus. I thought it is related to static address but it is worse (breakout board also showing two address but no details in the datasheet). The datasheet says that "Only a single AHT10 can be connected to the I2C bus and no other I2C devices can be connected." It sounds like traditional serial communication like RS232 not I2C. 

Is it normal to advertise it as an I2C device? and I also wonder what is the technical issue preventing to connect other devices with different address. Did you have any experience similar to this on any other sensor?

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  • Hi  ! I just ordered a couple ATH10 sensors without thinking much about it and when I downloaded the datasheet to start coding in advance I found the very sentence you are mentioning: "Only a single AHT10 can be connected to the I2C bus and no other I2C devices can be connected". I read this whole thread but I wanted to ask if you were able to share the I2C bus with other devices and if so, which ones ? 

    My idea is to also include a BMP180 atmospheric pressure sensor, as well as a I2C LCD display. Of course, they have different addresses, so in theory it should work, but this claim on the datasheet is alarming. I read about that library to make I2C work with any two pins, but I just couldn't understand how to couple that with the AHTxx or AHT10 library. It goes a bit over my head, and I couldn't find any examples.

    On a side note, were you able to change the address by moving the resistor? Did it work normally with address 0x39? 

    Thanks in advance, this thread alone has been super informative so far. 

  • in reply to jerosq

    UPDATE: 

    Sensors have arrived. It definitely seems like a translation error, as I was able to share the bus with the BMP180 sensor with no issues.

    Regarding the address change, I managed to move the resistor to the 0x39 spot and after wrestling a bit with the library I managed to get it working in said address. I'm yet to connect two sensors (0x38 & 0x39) simultaneously, but I think it'll work.

    Maybe the ATH10 wasn't as bad as I expected when reading about it in forums! 

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  • in reply to jerosq

    UPDATE: 

    Sensors have arrived. It definitely seems like a translation error, as I was able to share the bus with the BMP180 sensor with no issues.

    Regarding the address change, I managed to move the resistor to the 0x39 spot and after wrestling a bit with the library I managed to get it working in said address. I'm yet to connect two sensors (0x38 & 0x39) simultaneously, but I think it'll work.

    Maybe the ATH10 wasn't as bad as I expected when reading about it in forums! 

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