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You could use the pca9685 to Controller the enable Inputs and other io for select the a and b. Und Drive you Rover.

Or use one for MCP23017 for the io.

Other cheap solution is a something linke this http://s.click.aliexpress.com/e/EIOLVWva

You could use the pca9685 to Controller the enable Inputs and other io for select the a and b. Und Drive you Rover.

Or use one for MCP23017 for the io.

Other cheap solution is a something linke this http://s.click.aliexpress.com/e/EIOLVWva

as you rover has only 2 motors you could connect the pins to both pwm pins you do not use andy audio

it ist the bmc 12 and bmc13

see the positon from here https://pinout.xyz/pinout/pin33_gpio13#