SN754410 Motor driver

Other Hardware General Electronics
1

What is the role of the 10k resistor between the 5v to the enable pins of the driver? Why not connecting the 5v directly to these pins?

http://imgur.com/CSzPJEr

datasheet:

2

Its a pullup resistor, keeps the enable pins at a high level until the Arduino output pin pulls them low, so they don't "float". If they were connected directly to 5V you couldn't pull them low without creating a short circuit.

3

outsider:
keeps the enable pins at a high level until the Arduino output pin pulls them low

Except that the circuit doesn't show any external control, it just has the EN pins enabled with no option to bring them low anyway.

4

outsider:
Its a pullup resistor, keeps the enable pins at a high level until the Arduino output pin pulls them low, so they don't "float".

But the arduino should not pulls them low, they must be at high all the time (at least in my circuit)..

5

They will be with a pull-up resistor. Or you can connect them to +5V directly.