In SX Microcontrollers, SX/B Compiler and SX-Key Tool, CrustyNoodle wrote:

Hi,
 

I'm trying to get the sensirion SHT1x humidity sensor up and running with my SX28 and I'm having a little trouble...

 

I've adapted the example Basic Stamp code to mostly work under SX/B to the point whereby I am able to get readings from the SHT1x and I am able to do the calcs to get the correct temperature however I can't get the humidity calcs to work - due to my inexperience/ignorance I suspect.

 

The code example to linearize the humidity reading is:



[code]
 ' linearize humidity:
 '  rhLin = (soRH * 0.0405) - (soRH * 0.004 * soRH * 0.0007) - 4
 ' 
 

Note that soRH is a word variable that holds the reading from the SHT1x and rhLin is also defined as a word variable.

 

With Basic Stamp code to do this:

[/code]

[code]
rhLin = soRH ** 26542
rhLin = rhLin - ((soRH ** 3468) * (soRH ** 3468) + 50 / 100)
rhLin = rhLin - 40
 
[/code]

 So apart from the fact that I haven't managed to work out how we got from the first box to the second (I need to do more reading here) and that it would appear that SX/B can only do one math operation per line (I probably should have read this but ended up working it out by trial and error), I am still unable to replicate this code (or should I say the result from this code) using SX/B.

 

Is the answer straight forward or do I need to go back to school to learn about maths in binary and hex?

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