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I like to interface a humidity sensor over the I²C bus.

It should come in a small package, and consume little power. Accuracy isn't that important. I'm using the DS1621 as temperature sensor, I'd like something similar, but for a humidity sensor.

After looking for modules with my criteria, I came across the HYT271, but that thing is ridiculously expensive. The low-cost version HYT371 has about the characteristics I'd need, but it's currently not available from my dealer of choice...

I need something reasonable accurate for ambient temperature measuring, and at the same time not too expensive. Should be in the range of a few euros. (Bonus points if those chips can be sampled).

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Sensirion has combined temperature/humidity sensors. Their SHT21 and SHT25 have an I2C interface. Both come in a small DFN-6 package.

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  • \$\begingroup\$ DFN-6 is a bit tiny for manual soldering. But I'll take a look at the other package options. \$\endgroup\$
    – polemon
    Commented Apr 28, 2011 at 10:50
  • \$\begingroup\$ SHT25 looks really interesting, but it's like not available whatsoever. I guess I'd have to wait till engineering samples become available. Accuracy wise, this thing should be excellent. \$\endgroup\$
    – polemon
    Commented Apr 28, 2011 at 17:43
  • \$\begingroup\$ Just tried to sample the SHT21: Nope, they're not gonna send me one to my private address. They might send them to my university, though. But it seems you may order just one at a time... \$\endgroup\$
    – polemon
    Commented Apr 28, 2011 at 21:58
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I believe BME280 by Bosch is perfect for your purposes.

https://www.bosch-sensortec.com/products/environmental-sensors/humidity-sensors-bme280/

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