![]() ![]() Am I on the right track so far or are there serious problems with the design? Each I/O pin wired to the NC limit switches will be held LOW, then when opened go HIGH via a 10K resistor. The TOP/BOTTOM of each roll-up side will have a limit switch to tell me when the side is fully open or closed. When the switch gets closed, (depending on the direction), one of the I/O pins will go LOW. Each I/O pin on the switch is held HIGH via a 10K resistor. I need to detect UP, DOWN position of each switch, so I used two I/O pins for each switch. Hence, my "external power supply" question.ΔΆ SPDT momentary (center off, normally open) switches. Since I'll be using a 12VDC 36Amp power supply for this project to power the 2x32Amp motor driver, I figured I would use the logic +5v output off the driver to power the switches. ![]() ![]() The project is to control 2 roll-up sides of a greenhouse UP/DOWN. I'm scrapping the idea to supply 12VDC to the limit switches. ![]()
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