I have been working on attaching a fuel meter with an open collector output to my arduino uno to be able to electronically meter the amount of fuel I put through my gas pump. So far I am totally stumped as to how to get any type of signal on the arduino. I have tried to use a pull up resistor as was suggested to me, but this only causes the pin to remain in the "high" state no matter what flows through the meter. According to the guide, the output signal is an "Open Collector Output."
Here are the two options laid out in the meter guide to collect a signal: http://imgur.com/a/jQ1WR
Here is some further info about the meter I am trying to connect: http://catalog.gpi.net/item/g2-electronics/g2-meter-modules/conditioned-signal-output-module
Here is a diagram and pictures of what my current (failed) attempt looks like: http://imgur.com/a/ClMxq#5
Sorry to be such a noob, but I am very excited about the potential of this project and would appreciate any help anyone can give.