Sensirion

Shining Ivy

Hello I am new to the world of microcontrollers and this is my first posting on the forums. I am trying to make a environmental control system using the propeller chip, sensirion sensor, and a modified SensirionDemo to monitor then toggle an I/O pin to flip a relay, but I can't seen to understand the code that holds the value of humidity (or temp for that matter). I was thinking that if i declared a global variable and ran another cog to monitor that variable I could then have an "if" statement read the value and act accordingly, but apparently I don't know what I am doing. I have modified the display driver to work with the FullDuplexSerial because I dont have a TV. The code is attached. Any help would be very great.
Thanks

P.S. I have worked my way through the PE kit Lab and I am going back through it because obviously I need to.

WBA Consulting

The Sensirion object works very nicely, but in my opinion is not a true "demo" because it lacks the details to explain how to use the object exactly how you mention. This Thread I started back in August stems from the frustration I had when trying to figure out what the code is doing in the Sensirion object so that i could do more with it. What I ended up doing was stepping through every word of the code and tracing what was going on in each object. For example:

rawTemp := f.FFloat(sht.readTemperature)

Has nothing for a comment. However, here's my note for this line of code:
rawTemp equals the value returned by the readTemperature routine in the SHT (sensirion.spin) object after being formatted by the FFloat routine in the f (Float32.spin) object

That's really long winded for a comment, but that's my note I created after I analyzed that single line of code over and over again. Even though I have a few propeller projects on my completed list already, I haven't finished the PE kit. You should be able to do exactly what you are asking about and I would suggest doing what I did with the Sensirion code and then find a PE Kit lesson that digs deeper into sharing variables between methods/cogs. I think the Result variable explanation, page 74,may be a start. Once you have each of those down, just join them together. (This is how I have completed projects; I can mash up demo programs very well to make "my" desired program).

also, look here: http://forums.parallax.com/showthread.php?p=574524 Example 5 on the first page.

I am sure some seasoned "SPIN"ners will have more to say (and maybe even correct me)

Welcome to the forums!!!

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Andrew Williams
WBA Consulting
WBA-TH1M Sensirion SHT11 Module
Special Olympics Polar Bear Plunge, Mar 20, 2010

Franklin

If you have questions with the Propeller and spin you probably will get better, faster answers in the propeller forum. If you have questions on the sht11 you would post here.

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- Stephen