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= Observation Limits


|| value || max  || action ||
|| [[http://fact-project.org/smartfact/index.html?sound#pointing | Zenith angle]] ||  ~88° ||  reschedule
|| [[http://fact-project.org/smartfact/index.html?sound#fact|median current per pixel in camera]]  || 115 uA || reschedule or stop
|| [[http://fact-project.org/smartfact/index.html?sound#current|maximum current in a single pixel]] ||  160 uA || reschedule or stop
|| [[https://www.fact-project.org/sandbox/AllSkyCloudDetection/ | Clouds]] ||  no stars visible in pointing direction || reschedule or stop
|| [[http://fact-project.org/smartfact/index.html?sound#fact| abs(T_GAPD - T_ambient)]] ||  15° C ||  stop ||
|| [[http://fact-project.org/smartfact/index.html?sound#temperature| T_container]] ||  40° C ||  stop ||
|| [[http://fact-project.org/smartfact/index.html?sound#fact | Wind speed]] ||  50km/h || stop ||
|| Rain ||   ||  stop ||
|| [[http://fact-project.org/cam/index.php | water on mirrors]] ||  || stop ||


== "stop or reschedule"?

 stop::
  Stop the normal observation mode, by scheduling the task named `Sleep` 
  on the [[https://www.fact-project.org/schedule/| scheduler page ]] for __right now__. 
  This brings the system into a safe state and the shifter has time to think.

 reschedule:: 
   In case it seems possible to observe another source, 
   because e.g. another source is less obscured by clouds, 
   the shifter is of course free to try that. 

   Also sometimes SpecialMeasurements can be done. 



== ToDo

 * Explain how to check currents for alternative sources using smartfact.

 * Apply a filter to the wind speed, in order to convert the condition "significantly or in regular intervals" into a simple yes/no decision. And integral filter would maybe do, it converts "significantly" or "regularly" into a similar answer depending on the time constant of course.