Forums

favorite I2C temp + humidity sensor

Started by Winfield Hill April 13, 2019
 Seeking comments about your favorite I2C digital
 temperature plus humidity sensor.  We've been using
 Bosch BME280, which combines Press+Temp+Humidity,
 but want T+H only.  Now thinking of IDT's HS3001 
 Digital Relative Humidity and Temperature Sensor,
 which is also I2C.  Honeywell offers T+H sensors
 that include a hydrophobic condensation-resistant
 filter, e.g., HIH7131-021-001.


-- 
 Thanks,
    - Win
On Sunday, April 14, 2019 at 4:33:15 AM UTC+10, Winfield Hill wrote:
> Seeking comments about your favorite I2C digital > temperature plus humidity sensor. We've been using > Bosch BME280, which combines Press+Temp+Humidity, > but want T+H only. Now thinking of IDT's HS3001 > Digital Relative Humidity and Temperature Sensor, > which is also I2C. Honeywell offers T+H sensors > that include a hydrophobic condensation-resistant > filter, e.g., HIH7131-021-001.
Sensirion was one of the first to offer temperature and humidity integrated circuit sensors - I ran into them around 2002. Newark/element 14 lists some 33 of their parts, and stocks about half of those. http://www.farnell.com/datasheets/2700274.pdf is the cheapest, but they have no stock - it is shipped as full reels http://www.farnell.com/datasheets/1558257.pdf is twice the price but they have 169 in stock and it does ship in single units (on cut tape). -- Bill Sloman, sydney
bill.sloman@ieee.org wrote...
> >On Sunday, April 14, 2019 at 4:33:15 AM UTC+10, Winfield Hill wrote: >> Seeking comments about your favorite I2C digital >> temperature plus humidity sensor. We've been using >> Bosch BME280, which combines Press+Temp+Humidity, >> but want T+H only. Now thinking of IDT's HS3001 >> Digital Relative Humidity and Temperature Sensor, >> which is also I2C. Honeywell offers T+H sensors >> that include a hydrophobic condensation-resistant >> filter, e.g., HIH7131-021-001. > > Sensirion was one of the first to offer temperature and humidity > integrated circuit sensors - I ran into them around 2002.
Thanks, Bill. I had a folder of their stuff in my computer, but hadn't been taking a good look at them. I like what I see. -- Thanks, - Win
On 17.4.19 03:42, Winfield Hill wrote:
> bill.sloman@ieee.org wrote... >> >> On Sunday, April 14, 2019 at 4:33:15 AM UTC+10, Winfield Hill wrote: >>> Seeking comments about your favorite I2C digital >>> temperature plus humidity sensor. We've been using >>> Bosch BME280, which combines Press+Temp+Humidity, >>> but want T+H only. Now thinking of IDT's HS3001 >>> Digital Relative Humidity and Temperature Sensor, >>> which is also I2C. Honeywell offers T+H sensors >>> that include a hydrophobic condensation-resistant >>> filter, e.g., HIH7131-021-001. >> >> Sensirion was one of the first to offer temperature and humidity >> integrated circuit sensors - I ran into them around 2002. > > Thanks, Bill. I had a folder of their stuff in > my computer, but hadn't been taking a good look > at them. I like what I see.
I had the Sensirion sensors in some products. They have a somewhat modified view of the I2C/TWI protocol. Also, the sensors had a tendency of locking up without any external trigger, so we had to add a power switch FET to their feed to reset the lockup. -- -TV
Tauno Voipio wrote...
> > I had the Sensirion sensors in some products. They have > a somewhat modified view of the I2C/TWI protocol. Also, > the sensors had a tendency of locking up without any > external trigger, so we had to add a power switch FET > to their feed to reset the lockup.
Ouch, I don't have that on my production PCB. -- Thanks, - Win
On Saturday, 13 April 2019 14:33:15 UTC-4, Winfield Hill  wrote:
> Seeking comments about your favorite I2C digital > temperature plus humidity sensor. We've been using > Bosch BME280, which combines Press+Temp+Humidity, > but want T+H only. Now thinking of IDT's HS3001 > Digital Relative Humidity and Temperature Sensor, > which is also I2C. Honeywell offers T+H sensors > that include a hydrophobic condensation-resistant > filter, e.g., HIH7131-021-001. > > > -- > Thanks, > - Win
Hey, Win, what don't you like about the BME280? Just the extra cost? I designed them into a few different airborne boxes to monitor the environmental conditions. Convenient and tiny. --Spehro Pefhany
speff wrote...
> >On Saturday, 13 April 2019 14:33:15 UTC-4, Winfield Hill wrote: >> Seeking comments about your favorite I2C digital >> temperature plus humidity sensor. We've been using >> Bosch BME280, which combines Press+Temp+Humidity, >> but want T+H only. Now thinking of IDT's HS3001 >> Digital Relative Humidity and Temperature Sensor, >> which is also I2C. Honeywell offers T+H sensors >> that include a hydrophobic condensation-resistant >> filter, e.g., HIH7131-021-001. > > Hey, Win, what don't you like about the BME280? Just > the extra cost? I designed them into a few different > airborne boxes to monitor the environmental conditions. > Convenient and tiny.
I do like the BME280, and will still have one in my beehive monitor. But we need to spread T+H sensors around inside the hive, and it seems strange to have pressure at each spot. We'd also like redundancy. -- Thanks, - Win
Winfield Hill <hill@rowland.harvard.edu> wrote:
> speff wrote... >> >>On Saturday, 13 April 2019 14:33:15 UTC-4, Winfield Hill wrote: >>> Seeking comments about your favorite I2C digital >>> temperature plus humidity sensor. We've been using >>> Bosch BME280, which combines Press+Temp+Humidity, >>> but want T+H only. Now thinking of IDT's HS3001 >>> Digital Relative Humidity and Temperature Sensor, >>> which is also I2C. Honeywell offers T+H sensors >>> that include a hydrophobic condensation-resistant >>> filter, e.g., HIH7131-021-001. >> >> Hey, Win, what don't you like about the BME280? Just >> the extra cost? I designed them into a few different >> airborne boxes to monitor the environmental conditions. >> Convenient and tiny. > > I do like the BME280, and will still have one in my > beehive monitor. But we need to spread T+H sensors > around inside the hive, and it seems strange to have > pressure at each spot. We'd also like redundancy. >
Are there any such sensors that specify min- and max values. Specifying only typical values, as with th BME280, does not enhance my confidence in those products. -- Uwe Bonnes bon@elektron.ikp.physik.tu-darmstadt.de Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt --------- Tel. 06151 1623569 ------- Fax. 06151 1623305 ---------
Uwe Bonnes wrote...
> > Winfield Hill wrote: >> speff wrote... >>> >>> Hey, Win, what don't you like about the BME280? Just >>> the extra cost? I designed them into a few different >>> airborne boxes to monitor the environmental conditions. >>> Convenient and tiny. >> >> I do like the BME280, and will still have one in my >> beehive monitor. But we need to spread T+H sensors >> around inside the hive, and it seems strange to have >> pressure at each spot. We'd also like redundancy. > > Are there any such sensors that specify min- and max > values. Specifying only typical values, as with th BME280, > does not enhance my confidence in those products.
Whaddya want for dirt cheap? -- Thanks, - Win
On Wednesday, April 17, 2019 at 8:44:56 PM UTC+10, Tauno Voipio wrote:
> On 17.4.19 03:42, Winfield Hill wrote: > > bill.sloman@ieee.org wrote... > >> > >> On Sunday, April 14, 2019 at 4:33:15 AM UTC+10, Winfield Hill wrote: > >>> Seeking comments about your favorite I2C digital > >>> temperature plus humidity sensor. We've been using > >>> Bosch BME280, which combines Press+Temp+Humidity, > >>> but want T+H only. Now thinking of IDT's HS3001 > >>> Digital Relative Humidity and Temperature Sensor, > >>> which is also I2C. Honeywell offers T+H sensors > >>> that include a hydrophobic condensation-resistant > >>> filter, e.g., HIH7131-021-001. > >> > >> Sensirion was one of the first to offer temperature and humidity > >> integrated circuit sensors - I ran into them around 2002. > > > > Thanks, Bill. I had a folder of their stuff in > > my computer, but hadn't been taking a good look > > at them. I like what I see. > > > I had the Sensirion sensors in some products. They have > a somewhat modified view of the I2C/TWI protocol. Also, > the sensors had a tendency of locking up without any > external trigger, so we had to add a power switch FET > to their feed to reset the lockup.
The data sheet for the Sensirion SHT21 talks about a low power state and a "soft reset command" sent over the serial bus to get it going again. You haven't specified which part you used, nor whether the "locking up" feature you observed was a bug - not mentioned in the data sheet or the supporting literature - or a feature which happened to have been ignored by the engineer that set up the system. I've had to tidy up enough systems that were put together by slap-dash engineers working under time pressure to be aware that some people don't seem to be able to find the time to read datasheets carefully and comprehensively. -- Bill Sloman, Sydney