It is HIGH when device is deselected and LOW when we select device, so in order to lit led when device is working (is selected) I have to Invert logic (Led lit when SS is LOW).I do not know other solution, if there is any I would appreciate any tips.
Yes, simply wire the external led such that it's anode pin is wired to ground and it's cathode pin is wired through a series current limiting resistor to the SS pin. When SS pin is low, led will light up.
Which is better for converting 5v to 3v3
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