giuliomoro So I've been trying to strip the challenge down even further to make it easier both for myself and you guys to understand.
I am now supplying 3.3v from the bela and returning to gnd on the same bela. I have copied the pull-down resistor schematic exactly on a breadboard, EXCEPT I'm not using a button. Rather, I'm using an LED to make sure there is power. Instead of a button, I'm manually connecting and disconnecting the power supply. Is there any reason this would not work? What functionality would the button add to this? This is in essence the same way the finished project will work, except the power supply is external.
Some background on the project:
I am using the Bela Mini wth the multichannel extender. The project is a tunnel with 5 laser sensors. Each sensor has a correlating power supply feeding 3.3v when triggered by the sensor. In turn, it feeds 0v when not triggered. I will use this to trigger on and off 5 separate sounds going to 5 separate speakers, all acting independently of each other. The 5 power supplies are connected to 5 different digital pins and the ground cables are soldered together into one common gnd pin on the bela.
In my mind, this should be quite straightforward, but I'm not receiving any signals into the bela.
Photos of my puredata prototype and breadboard setup. The breadboard photo does not show a resistor going to ground. I've tried both with and without the resistor (10k). Photo of the signal generator in the previous post. This is a photo of the breadboard and Bela set up for a simple digital in test.