7i96 and L298N Spindle

Trying to figure out how to connect up a L298N to a 7i96 to control a spindle motor with PWM

The ENA pin with the jumper removed gets PWM, the IN1 and IN2 set the direction of rotation so one or the other have to be high.

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With the 7i96 set to PWM type 1 PWM on Out0 and Direction on Out1 how would I get reverse?

JT

Enable on the 298 to PWM on 7i76
in 1 to direction
in2 to inverted direction

I'm not following you, PWM is on Step 4 and Direction is on Direction 4 pins on the 7i96. I'm assuming that the Dir 4 pin is on for one direction and off for the other. If I try and use an I/O pin they are 24vdc and would fry the L298N I think.

JT

Thought you were using the 26 pin header for that.
A transistor and two resistors can do the inverting for the other pin, but that requires soldering and other parts.
A 7404 has 4 inverters.
Still i would use the 26 pin header for that and invert the signal in hal.

BigJohnT wrote: If I try and use an I/O pin they are 24vdc and would fry the L298N I think.

JT

A two resistor voltage divider can take care of lowering the voltage.

The LM298 inputs are TTL level so

7I96 PWM (STEP4-) to LM298 ENABLE
7I96 DIR4+ to LM298 IN1
7I96 DIR4- to LM298 IN2

You will have to invert the PWM output polarity in hal

I would add a 1K or so series resistor in the LM298 control lines
so if the LM298 blows, you dont kill the 7I96 output chip