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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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  • I had a quick look at the data sheet. They don't appear to offer an explanation for why it doesn't work with other devices.

    I've used several other I2C humidity sensors and lots of I2C devices of other kinds. This is the first one I've seen that doesn't really work in an I2C bus system at all. (Some others have issues.)

    The good news is that it is very easy to make I2C devices work with normal IO pins so it should might be possible for you to connect it up without killing your I2C bus if you need that for other things.

    If you describe your system a bit more (schematic, controller type, pictures) it might be possible to make some definite suggestions.

    MK

  • in reply to michaelkellett

    Hi   , I am planning to use it for Save the Bee design challenge. I can use GPIO as you suggested, use I2C mux, or simply change the sensor but I wonder is it normal? I just bought it because it supports I2C so I thought I could use the same pins for various devices but it is not possible. This is a cheap product so I don't mind. I wonder it is my mistake or its product's fault. I also want to learn is there any weird things similar to this. 

  • in reply to msimon

    It's definitely not normal. I can't think of any other I2C chips that make such a requirement.

    I've used TI and Sensirion Humidity  sensors with no problems.

    MK

  • in reply to michaelkellett

    I see. Someone used the term "partial compliance". I think it should be stated in the data sheet and on the seller's page as it doesn't comply with the actual protocol. 

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