I'm trying to put together a bubble counter using this device:
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My plan was to link to a microcontroller and have it perform a function if the count got above a certain level. I've programmed my controller and it works fine. However, it playing around with the breadboard, I hooked up my 819 device incorrectly. I'm not sure how I had it hooked up, but I remember thinking, "Oh no, I shouldn't have that wire there!" Anyway, now I'm trying to test it using this app note:
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So, when I hook the red wire (1) through 170 Ohms to 5V and the white wire (3) through a 10K resistor to 5V, with black (2) and green (4) hooked to ground, I get high signal no matter what. I'm guessing I fried it. Can I test it like a transistor? Is there any other way to test or am I still totally missing the right way to hook it up? Any advise would be appreciated.
Thanks