Hi All, I have a piece of industrial equipment that uses 24 volts for signaling between 2 pieces of equipment. I have a CZH Labs DB25 pin breakout board and I can measure each pin with a volt meter to ground to see which signal is being sent. What I would like to do is add leds to all 25 pins so that when I signal is on the led is lite.
I can also use this for other systems, so I know I need to add a resistor to one side of the leds, but can I do both? And what size should I use? And same for Led's. I'm looking for any recommendations. Thanks Erhard

Board that I have

https://czh-labs.com/products/czh-l...bmJECONqCJs4e3intfvaepjau4N-dwrQaAuCXEALw_wcB

 

One resistor is enough. A second resistor would be superfluous