3V3 digital signal to the cRIO

[magnets]

Originally Posted by yash101

An opto-isolator is a splendid idea that will almost always work. Why did someone not already bring it up?!?! Kudos to you .

Using an analog signal would be getting a little off from what we want here. For something like the raspberry pi or propeller would be hard to interface with a DAC/ADC couple. On the RPi, I don't know if you'd even have enough GPIO!

I think the idea behind the analog inputs is to use the analog module on the cRIO because it doesn't have a pull up resistor like the digital ones do. You can make the analog input behave like a digital input and return true if the voltage is above 2v, and false if it is below, without having to worry about the pullup resistor to 5v.