Stepper Motor Using L297 And L298 Ic Driver Chip Is

Vref is the input into L297 How come you say Vref of a driver chip is the output, that you can use your ADC to measure this voltage.

First connect each motor to the A and B connections on the L298N module.

If youre using two motors for a robot (etc) ensure that the polarity of the motors is the same on both inputs.

Otherwise you may need to swap them over when you set both motors to forward and one goes backwards Next, connect your power supply the positive to pin 4 on the module and negativeGND to pin 5.

If you supply is up to 12V you can leave in the 12V jumper (point 3 in the image above) and 5V will be available from pin 6 on the module.

Dont forget to connect Arduino GND to pin 5 on the module as well to complete the circuit.

Now you will need six digital output pins on your Arduino, two of which need to be PWM (pulse-width modulation) pins.

PWM pins are denoted by the tilde () next to the pin number, for example in the image of the Arduino Unos digital pins.

In our example we have two DC motors, so digital pins D9, D8, D7 and D6 will be connected to pins IN1, IN2, IN3 and IN4 respectively.

Then connect D10 to module pin 7 (remove the jumper first) and D5 to module pin 12 (again, remove the jumper).

The motor direction is controlled by sending a HIGH or LOW signal to the drive for each motor (or channel).

For example for motor one, a HIGH to IN1 and a LOW to IN2 will cause it to turn in one direction, and a LOW and HIGH will cause it to turn in the other direction.

However if you need to control the speed of the motors, the PWM signal from the digital pin connected to the enable pin can take care of it.

This is what weve done with the DC motor demonstration sketch.

Two DC motors and an Arduino Uno are connected as described above, along with an external power supply.

Then enter and upload the following sketch: So whats happening in that sketch In the function demoOne() we turn the motors on and run them at a PWM value of 200.

This is not a speed value, instead power is applied for 200255 of an amount of time at once.

Then after a moment the motors operate in the reverse direction (see how we changed the HIGHs and LOWs in thedigitalWrite() functions).

To get an idea of the range of speed possible of your hardware, we run through the entire PWM range in the function demoTwo() which turns the motors on and them runs through PWM values zero to 255 and back to zero with the two for loops.

Finally this is demonstrated in the video on this page using our well-worn tank chassis with two DC motors.

Stepper Motor Driver Using L297 And L298 Ic