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adafruit / Adafruit_CircuitPython_SHT4x

Python library for SHT4x temperature / humidity sensors
MIT License
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Documenting if and if yes how to change the address #8

Closed viktoriasee closed 3 years ago

viktoriasee commented 3 years ago

It is not clear from the Adafruit documentation right now whether one can change the i2c address in order to use two sensor boards at once. It is clear from the Sensirion documentation that there is no hardware solution to change the address like the older SHT3x had.

jposada202020 commented 3 years ago

Yes I think you are right, but normally we document the features of a certain device. could be very difficult to document what is not featured. Could you point me in the right direction in the datasheet, I was reviewing the datasheet and I could not find the reference that you mentioned, the closes was that depending on the model the device address is different.

Thanks.

viktoriasee commented 3 years ago

I am talking about the Adafruit 4885 which basically is an evalboard of the Sensirion SHT40. The reference in the datasheet of the Sensirion SHT3x is on page 8: You see there is a dedicated leg on the hardware.

The SHT4x does not come with this feature, see p. 13 of the datasheet.

jposada202020 commented 3 years ago

Understood. I got the idea with the datasheet. You would like a note in the documentation that specifies that for the SHT4x you could not setup the address. If does not hurt to have it, that clarifies things for folks hat works with both type of sensors. would you want to make a PR to modify the documentation? Thanks

viktoriasee commented 3 years ago

Well it is one detail to state in the doc that there is no integrated hardware solution to change the address. But is it possible to change the address in software? How? I did not read the entire NXP I2C bus specification. For such an evalboard I would consider a dip switch or a soldering bridge most userfriendly to select an address.

ladyada commented 3 years ago

added a note here https://learn.adafruit.com/adafruit-sht40-temperature-humidity-sensor/pinouts it is not possible