Basic Switch Input Questions
Posted: Sat Nov 26, 2016 11:48 am
Sorry, I'm starting really basic here.
Can anyone explain, confirm, or deny the two possible scenarios of the attached schematic?
This will assume PDM is on, and the switch at point (F) is open. The red lettering is mine. You might need to scroll a bit to see the whole picture.
Scenario A
Points (A) through (F) are seeing some type of current flow.
If this statement is true, the CPU is making a ground somewhere at (H?) to allow current to flow from +Batt to point (E) where it is being monitored by the CPU.
When the switch at (F) is closed, electricity follows the path of least resistance to 0V at point (G).
The CPU sees a change in state at (E) and executes Logic Condition as programed.
Scenario B
There is no current measured at (A) through (F).
Only until the switch closes at point (F) does the circuit ground itself, which then allows current to flow from +Batt to 0V at point (G).
The CPU is now able to monitor the current at (E) and executes Logic Condition based on programing.
Or, is there a Scenario C?
Can anyone explain, confirm, or deny the two possible scenarios of the attached schematic?
This will assume PDM is on, and the switch at point (F) is open. The red lettering is mine. You might need to scroll a bit to see the whole picture.
Scenario A
Points (A) through (F) are seeing some type of current flow.
If this statement is true, the CPU is making a ground somewhere at (H?) to allow current to flow from +Batt to point (E) where it is being monitored by the CPU.
When the switch at (F) is closed, electricity follows the path of least resistance to 0V at point (G).
The CPU sees a change in state at (E) and executes Logic Condition as programed.
Scenario B
There is no current measured at (A) through (F).
Only until the switch closes at point (F) does the circuit ground itself, which then allows current to flow from +Batt to 0V at point (G).
The CPU is now able to monitor the current at (E) and executes Logic Condition based on programing.
Or, is there a Scenario C?