Tag Archives: sht11

The Temp/Humidity/Dewpoint Datalogger: Final Product

Well, due to eBay difficulties, I was severely delayed in finishing this project. It seems that the person that I ordered my first blue LCD display from didn’t want to send a few folks their stuff this month. I went to check on the status of my order, and there were negative feedbacks from around the time that I placed it. So much for that. They sure were inexpensive.
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How to Read a Datasheet: A Beginner’s Guide

Manufacturers publish datasheets for everything that they make so that we can use the parts as they are intended. How many watts can my transistor dissipate? What pin is the ground pin? How do I communicate with this RTC? Every day in electronics someone is asking how something works. It’s really easy to ask someone else, and then wait for their reply and hope they are right, but we are given tools to use. Nevertheless, it’s a whole new world to try and figure it out on your own.
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The SHT11 Temperature Probe Lives!!!

I combined my LCD and temp probe files into one and compiled…and (revised and compiled)*(at least 20 times)!  (revised and compiled)*(at least 20 times)=a long night. I started working on this from 3 to 4pm. Then I picked back up at 10pm and I finally had it working by 2am. I now have a temperature, humidity and dewpoint reading. The SHT11 (from eBay or Parallax) is a great little item once you get a program written for it. Since I like to use Microchip and CCS C, I had to write a program, but I used the Basic Stamp examples for guidance.
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Temperature, Humidity, Dewpoint and Clock datalogger

This is another project that I am currently working on. I started this one back in February and had quite a bit of programming done. I am using the PIC16F887 microchip and programming it in C. I had pages upon pages written, and the program was deleted from my computer. Well, today I am glad that it was deleted because it has enabled me to write a much better program. My first one was very sloppy. I started writing the program into several parts to keep it simple, and at the end I will slowly begin to combine the segments as needed. The first thing I will need to do is combine an LCD snippet and the SHT11 temp probe snippet to make sure that the SHT11 portion of the program actually works. I wrote the program according to examples from the BasicStamp, and sometimes breaking those down can be tough.

SHT11 datasheet hosted on www.sensirion.com