Hi guys. I just bought an optical sensor to enable the marlin filament runout sensor function . I use ramps 1.4. From what I know, i need to connect all three pins as following. V to V , gnd to gnd and D4 pin to signal. I have posted a picture with the Ramps 1.4 pins. But what is weird, where the circe is red, actually I get +5V instead of nothing (I have measured with a multimeter). But Red circle should be the D4, the signal pin. And the green circle I get nothing. It's like D4 signal pin and +5V pin are switched. I also switched the connections on sensor, i inserted the filament into it but the optical sensor LED is still off. I disable #define FILAMENT_RUNOUT_SENSOR // this line in marlin. What could be the problem? Because when it's working I think that LED from the optical sensor should be on.
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