comparing various Adafruit temperature+humidity STEMMA QT sensor boards

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vladak
 
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comparing various Adafruit temperature+humidity STEMMA QT sensor boards

Post by vladak »

I'd like to monitor temperature and humidity in each room/closet in our apartment. To do so, I'd like to use something like Adafruit QT Py ESP32-S2 WiFi Dev Board with STEMMA QT with a STEMMA QT board. The QT Py's will send the metrics to a MQTT topic.

Now, Adafruit offers quite a bunch of sensors with STEMMA QT capable of measuring temperature and humidity. I'd like to buy one that has CircuitPython library, is reasonably precise and ideally under $10.

For my outdoor temperature measurement I'm already using Adafruit TMP117 ±0.1°C High Accuracy I2C Temperature Sensor - STEMMA QT / Qwiic which is nice and precise, however does not measure humidity. I like that it has the cut-out to avoid temperature bridging.

Now, my candidates are: Which one should I take ? Also, has anyone tried to complete a table of differences between these already ?

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Franklin97355
 
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Re: comparing various Adafruit temperature+humidity STEMMA QT sensor boards

Post by Franklin97355 »

I have an aht20 in my closet and found it adequate. The environment does not shift and does not need to be precise ( I can't tell a few degrees up or down and the air handler cycles a bit.) You need to figure out what is important in what you are using it for

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vladak
 
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Re: comparing various Adafruit temperature+humidity STEMMA QT sensor boards

Post by vladak »

Franklin97355 wrote: Sat Sep 24, 2022 1:44 pm I have an aht20 in my closet and found it adequate. The environment does not shift and does not need to be precise ( I can't tell a few degrees up or down and the air handler cycles a bit.) You need to figure out what is important in what you are using it for
Thanks for the reply. I am also inclined towards AHT20 as it is simple design with the cut-out, cheap, has CircuitPython support and reasonable precison for home indoor use. I'd also like to get something that supports deep sleep to save power, maybe that's a I2C rather than sensor board feature.

I asked primarly to get a knack of how people decide between the variety of temp/humidity sensors. Some of these have funky features like CRC protection, ability to change I2C address, extended high accuracy ranges, filter in front of the sensor etc.

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Franklin97355
 
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Re: comparing various Adafruit temperature+humidity STEMMA QT sensor boards

Post by Franklin97355 »

I asked primarly to get a knack of how people decide between the variety of temp/humidity sensors. Some of these have funky features like CRC protection, ability to change I2C address, extended high accuracy ranges, filter in front of the sensor etc.
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I think it is knowing what you want it to do and the willingness to experiment, it's also the fun. Let's see if others have opinions on the subject.

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