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Jun 23, 2014 at 23:20 comment added Rip Leeb It worked! It worked sporadically after I actually connected pins 10 and 11 as jfpoilpret suggested, but it works consistently with the enable pin grounded. In fact, this fixes another issue I was having - I had been needing to disconnect the 5V supply line from the arduino board in order to upload code to it. Now, that is not needed. Thanks!
Jun 23, 2014 at 23:15 vote accept Rip Leeb
Jun 23, 2014 at 19:10 comment added Greg Hewgill @Nate The exception is inputs that are marked with an X in the truth table (which indicate a "don't care" input).
Jun 23, 2014 at 19:09 comment added Greg Hewgill @Nate It's not just stability, but the enable pin 15 is an input to the logic in the chip. The output depends on the state of all inputs as defined by the truth table in the data sheet. The enable input is pretty important and its state is undefined if you don't connect an input wire to it. If the enable input is undefined, then it follows that the output is undefined.
Jun 23, 2014 at 18:43 comment added Rip Leeb I've heard a few things about floating pins and grounding them for stability's sake. Any suggested reading to help me fully understand the subject?
Jun 23, 2014 at 2:59 history answered Greg Hewgill CC BY-SA 3.0