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during the inversion period check voltages at input 1 and input 2 ... IC pin no. 2 and 7 respectively using a multimeter. this will verify that the Attiny85 is actually sending out a signal to rotate motors. during the normal motion check the voltage at input pin 1 and input pin2 for reference. do let me know
just try swapping the motor connections it will do the trick ! else if you want to do that in code swap values of any one pair i.e. LOW to HIGH and vice versa
do let me know how can i help you with that .
The circuit in the project is in accordance to the pinout of L293D IC. Functions of pins are fixed by the IC manufacturer such as Pin 4,5,12,13 are gnd pins. there are 2 enable pins to activate and deactivate their respective side, as L293D is a dula h-bridge.
L293D Motor Driver View Instructable »