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Multiple Temperature and Humidity Sensor
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Please be positive and constructive with your questions and comments.

Multiple Temperature and Humidity Sensor

by et1311 on Tue May 11, 2021 6:14 pm

Hi I have the following temperature and humidity sensors

Adafruit Si7021
Adafruit SHT40
Adafruit SHTC3
Adafruit SHT31-D

I also have the FT232H board.

I tested the four sensors indipendently using the FT232H. I would like to know if I can connect all of them together using the JST SH 4-Pin Cable one after the other? Or do I need a Breakout - 8 Channel?

et1311
 
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Re: Multiple Temperature and Humidity Sensor

by adafruit_support_carter on Tue May 11, 2021 7:46 pm

It all comes down to each device having a unique I2C address. The defaults appear to be:

Adafruit Si7021 = 0x40
Adafruit SHT40 = 0x44
Adafruit SHTC3 = 0x70
Adafruit SHT31-D = 0x44

So there's a conflict between the SHT40 and SHT31-D. But, you can set an alternate address for the SH31-D using the address pin (or solder jumper on back):
https://learn.adafruit.com/adafruit-sht ... -1536805-6
to set the address to 0x45.

Then you can sanity check the setup by chaining the together and doing an I2C scan to make sure you see all the expected addresses.

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Re: Multiple Temperature and Humidity Sensor

by et1311 on Wed May 12, 2021 9:55 am

Ok sounds good. So if I properly change the address of that sensor. I will be able to connect them all one to each other using the connectors and then to the FT232H board, collecting the temperature and humidity from all of them at the same time. Correct?

I also have a question regarding the JST SH cables. is there any information regarding the maximum operating temperature?

et1311
 
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Joined: Thu Apr 22, 2021 9:51 am

Re: Multiple Temperature and Humidity Sensor

by adafruit_support_carter on Wed May 12, 2021 12:12 pm

Yep, correct. And doing the I2C scan is a quick check that they all show up as expected, before trying to actually talk to them to retrieve data.

Not sure about temperature rating. I'll ask and see what we may have.

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Re: Multiple Temperature and Humidity Sensor

by adafruit2 on Sun May 16, 2021 3:51 pm

for the JST SH cables, max is 80 *C (its printed on the cable wire)
probably would be fine down to -20 *C

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Please be positive and constructive with your questions and comments.