Sensirion SHT11

C

CWells

New Member
I'm trying to interface a SHT11 temp/humidity sensor with a Picaxe-08M, and I'm having trouble figuring out the Shiftout routines. According to the manual, SPIOUT works, but it won't for me. I found the equivalent routines, but I can't see how they work exactly, and I don't know how to handle the "ack" bits. I only need to read the humidity for this application, and if someone could help me with the code, I could figure out the temp part if I had to. Could someone post some pseudocode so I can figure out the 9-bit start sequence, and the handling of the ack bits?
 
X

xstamp

Senior Member
Parallax have a couple of N&V articles about SHT11 intefacing on their site.

www.parallax.com/dl/docs/cols/nv/vol3/col/nv91.pdf

Although you will not be able to use 'BASIC Stamp examples directly, they might act as useful 'pseudocode'.



 
C

CWells

New Member
Yup, got that article. I've already got it working with the BS2, I need to convert the code for the Picaxe. I just need to figure out the shiftout & shiftin routines with the ack bit.
 
B

BrendanP

Senior Member
Hi Chris, I have an app for a temp/humidity sensor. Can this device be used with I2C on the 28X/40X parts?

 
 
C

CWells

New Member
Brendan, I don't know the answer to your question, but I think I2C isn't quite compatible.
I think I've got the protocol figured out now, I'll know for sure in a little while, as I'm coding now.
 
G

gmoulds

New Member
Chris,

Just interested how you got on. Just started the same project myself. Interfacing the SHT-11 to a 08M

Grahame
 
C

CWells

New Member
The project was completed, and is currently still working.

I had to hunt around for a while, but I found detailed info about the communication protocol of the SHT-11, and was able to figure out what I was doing wrong.

Now if I can only figure out my LCD AppMod...
 
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