The coils of wire in a motor have a measurable resistance.
Take your DMM and measure the resistance of the motor i.e. across the motor’s terminals.
Divide the motor power supply voltage by the resistance you measured gives you the stall current (startup current).
ex: Power supply is 3.3v, motor resistance is 3 Ω.
3V3 ÷ 3 Ω = 1.1 amps.
HI,
In the first setup did you have a connection between the ESP-12E gnd and the 9110 gnd?
DMM is Digital Multimeter.
Thanks... Tom... 
That's how much current you need to get the thing spinning... once it's running it needs much less than this, but your driver needs to be able to handle the worst case, so this is the important number to consider.
The driver you have is suitable (provided you have a suitable power supply)...
The reason it didn't work when you first tried is most likely because your code is wrong. See post #15
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