![]() I apologize if I was not clear enough, I am more of a mechanical guy, than an electronics hardware guy. So my question is, what is the major difference between Totem-Pole and Open Collector that causes them not to be interchangeable, and what do I need to do to get a reading from my OPB973 Open Collector Setup. Some suggested using a pull up resistor (10k) from Vcc to +5V and I tried that with no success. I have found some pages with info, but none on my specific type of sensor. Now when I try with a similar setup, all I get is a 0 output when trying both digital and analog Reads. the totem pole circuit is formed by utilizing the two NPN type triodes, and the output waveform of the totem pole circuit is more stable in a high-temperature environment due to the same. The site I was ordering from did not have any of the same Totem-Pole sensors in the inverted version (OPB972.) so I ordered the OPB971 and OPB973 Open Collector versions. The problem is I need it to be inverted and give me a 0 when it is unblocked and a 1 when it is. It gave me a 1 when it was unblocked and a 0 when the flag was in the slot just like it should. Sensor: Vcc - 150 Ohm Resistor - +5V (from Arduino) Everything was fine in my setup, I had:Įmitter: Anode - 150 Ohm Resistor - +5V (from Arduino) ![]() ![]() I was using an Optek OPB970N11 as an optical limit switch on a project. ![]()
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