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

Jim
I am using the microcontroller to detect fault conditions in an astronomical observatory that is remote to me. I need to effect dome closure  when various parts of the total system fail or the weather gets bad. I wanted an independent assessment of the ac power to start dome closure before the UPS system runs out of power. I am not knowledgeable enough to know whether I should totally trust the UPS to close the dome on its own detection of power loss. However, the uPS can be programmed to execute a dome closure program when it begins its shutdown operations which in principle makes ac power detection moot. Since I need the microcontroller for other chores I thought adding this task would increase reliability. The suggestion of using a regulated 5V power supply directed to an SX input pin through a resister seems a very straight forward way to detect ac power and is logically equivalent to the ups related detectors you  suggest.

marshall

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