Adding index.md to be used for documentation

docs/index.md

@@ -1,37 +1,36 @@
-## Welcome to GitHub Pages
+# Tank Controller
+
+The library for Tank Controller. 
+As more features get added to the library, they should only be added when testing for that feature is included.
+
+## Topics for documentation
+
+### Things to document
+
+* Discuss debug strategy and logging via serial
+
+* Document items in the EEPROM
+  * pH
+    * Precision x.xxx (three decimal places)
+    * Common sea water 8.2
+    * Experiments target 8.1 to 7.5
+    * probe accuracy - can be to a few thousand (more likely to hundreth)
+    * Thousand is helpful for setting and managing tank
+    * **Probably could have a section on science of pH**
+    * Requires calibration (1 and 2 point calibration)
+      * Precision of xx.xxx
+      * Sets the compensation temperature (required temperature to accurately measure)
+      * Reading must stabilize (TODO make notification when stable)
+      * both temperature and pH probe are used in calibration
+      * **Needs detailed calibration instructions** (both manual steps and device code process)
+    * <http://www.4oakton.com/TechTips/TT_ph.pdf>
+  * PID
+    * Calculates the length of bubbling
+    * Must be longer than a tenth of a second to open the device for bubbling
+    * Magic to get desired pH
+  * Temperature (Celcius)
+    * 0.03 accuracy
+    * Requires calibration
+    * Experiments target 10 to 15
+    * Both chillers and heaters
 
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