3A Counter

[apatel225]

Anyone have any low cost/simple solutions to count the contact closure of a microswitch with 3A, 28VDC running through it?  This is for a life cycle test to test the life of the microswitch. 

[AnalogKid2DigitalMan]

Measure the voltage across the switch and use a resistive divider to cut the voltage level down to what your analog or digital input can handle.

Switch open will present 24V across it, swiched closed and the voltage will drop to zero (or near zero, depending on the contact resistance).

-AK2DM

[johnsold]

You may also need to include some filtering or other debounce technique to get an accurate count of cycles.

Lynn