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kda406
Joined: 17 Sep 2003
Posts: 97
Location: Atlanta, GA, USA
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 Posted: Wed May 06, 2020 1:45 pm |
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I'm rolling out a product using the Sensirion SHTC3.
* I2C
* Low power
* Does the conversion itself
* Self calibrating
* +/-2% accuracy
* Fast at ~8s response time
* Inexpensive ($1.49USD today)
* Provides temperature
* Provides relative humidity
In our case, it is everything we wanted for our indoor sensor.
For this product I used a PIC16F1824, although it is overkill for the task. The entire PCB is less than the size of the first 2 knuckles of my index finger.
-Kyle |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19537
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| Posted: Thu May 07, 2020 12:45 am |
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Very good.  |
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temtronic
Joined: 01 Jul 2010
Posts: 9241
Location: Greensville,Ontario
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| Posted: Thu May 07, 2020 4:50 am |
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The PIC's too small....after a couple of inhouse revisions, and 3 customers requests.....you'll need 5 extra I/O pins, more memory and 2 more peripherals and a PCB twice as big. 
THAT's the reason I like the 18F46K22.....a 'man sized' PIC with more 'under the hood' thatn any sane programmer really needs....well, maybe just 2 more I/O pins would be nice....  |
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mdemuth
Joined: 16 Apr 2007
Posts: 71
Location: Stuttgart, Germany
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| Posted: Tue Jun 02, 2020 6:54 am |
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Sensirion's SHT21 is used to measure "ambient clima".
Simple to apply with I²C with high precision. |
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Gabriel
Joined: 03 Aug 2009
Posts: 1067
Location: Panama
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| Posted: Tue Jun 02, 2020 7:48 pm |
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Ive used the Si7021 ans HIH6130, interchangably in a low volume commercial product i rolled out, with preference to the Si7021 due to cost and durabilty. Ive had several of the HIH6130 fail, but i have no way of knowing if user fault is the cause. NEVER UNDERESTIMATE HOW STUPID YOUR END USER WILL BE.
I am currently working on a new design using the Si7021 for volume production.
_________________
CCS PCM 5.078 & CCS PCH 5.093 |
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Gabriel
Joined: 03 Aug 2009
Posts: 1067
Location: Panama
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| Posted: Tue Jun 02, 2020 7:51 pm |
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Temtronic check out the 18F47Q43... and more importantly look at its errata! I just got my first prototypes and I'm having a good time! Except having to move to MPLABX....
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CCS PCM 5.078 & CCS PCH 5.093 |
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gaugeguy
Joined: 05 Apr 2011
Posts: 303
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| Posted: Wed Jun 03, 2020 10:04 am |
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| Keep in mind the errata on new chips tends to grow quite significantly for the first year or two. They do not know yet about all of the errata. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19537
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| Posted: Wed Jun 03, 2020 10:30 am |
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Yes, and Gabriel you need to update your signature. The 47Q43 was only
added with 5.093 I think.... |
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Gabriel
Joined: 03 Aug 2009
Posts: 1067
Location: Panama
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| Posted: Wed Jun 03, 2020 4:22 pm |
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Hahaha yes Ttelmah I need to update it.
I had to update MPLAB, CCS to 5.093 AND to a new Pickit4!
...it had to happen at sometime.
Hopefully i can hold off windows 10 for a while longer.
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CCS PCM 5.078 & CCS PCH 5.093 |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19537
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| Posted: Fri Jun 05, 2020 12:52 am |
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I must admit it is a very nice looking chip. I wonder if MicroChip have
actually spent rather more development time on it, than they do on
many of the PIC's, since a lot of peripherals are slightly different from
their previous incarnations, and the errata list is the shortest I have
seen on a 'new' chip for a very long time.
Potentially 'hopeful'...
64MHz operation at 1.8 to 5.5v. Impressive.
Be aware though that there may well be compiler setup 'hiccups'. The
first compiler version for a new chip should always be treated with
'caution'.... |
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