I purchased a refurbished coin hopper that sends out a sensor signal when a coin is ejected. For a Pi though, the signal is bit strong:
open collector NPN - active low, maximum sink of 25mA at 35Volt maximum.
I'm thinking the 35Volt max will be lower as I'm using a 12VDC input instead of 24VDC to power the hopper (it offers both options).
I found that I may need a voltage divider. If that is indeed the case, I'm having a difficult time visualizing the diagram as plugged in wires (I know, and it's late). I'm also unsure of what strength of resistors I will need for this.
Do you have an idea of how I would get that signal down to 3.3V, 13mAish(?) so not to blow up my Pi?
Thanks for taking a look!