You will find it much easier to use standard A4988-based stepper driver modules than the L293D, and they will work much better (i.e. faster because of the constant current drive, suitable with a wide range of supply voltages, and they will generate less heat) . As well as the Pololu originals, clones are readily available on eBay. They already have STEP and DIR inputs, and unlike the L293D, they support microstepping. Be sure to turn down the current to 500mA or less using the pot.
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