PWM pin for driving motor speed.

Development Boards Arduino
1

Hi everyone,I have read the way of driving motor(speed and direction) with H-bridge IC(L293NE or SN754410). Some said, Arduino’s PWM pin is attached to L293NE’s pin NO.1(Enable pin/1,2EN) and other said, attached to one of Logic pin on H-bridge IC(PinNO.2 or 7) for controlling speed. Which one is correct.

Thanks.

2

Both can be correct. It depends on the rest of the circuit.

Driving the enable using PWM will modulate the transistor in and out of high-z. Driving the enable also effects two channels (at least for the SN75)

Driving the control signal using PWM will open and close the transistor for that specific channel.

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Hi fll-freak,Thanks for your reply.