You can run this forever without the controller getting hot. Use this simple routine after every step (see example). Make sure the output pins are set to 0 after a myStepper.step() instruction.
Usually the Arduino pins used for driving the L298N are 8, 9, 10 and 11. This kills the L298N and it heats up like a frying pan. This is actually a practical sketch and circuit as it allows us to control each motors speed independently using the two potentiometers.
#L298N MOTOR DRIVER ARDUINO FUNCTION FULL#
When using the stepper.h file, the stepper always stops at a position at which it is held at full current. Finally the analogWrite function is used to produce PWM pulses to the enable pins on the L298N H-Bridge Motor Controller. Notwithstanding the issue of specs, I feel like a pet-feeder should not require industry strength controllers. The L298N is a very basic motor controller. The stepper.h include file does only provide a very basic stepper motor object. This is an old post, but I thought to bring something more helpful to the newbies. In the case of a 6.8 ohm resistor in series with a 1.7 ohm coil, it's reduced by a factor of 5. The series resistor (or PWM but I'm not discussing that here) means that the time constant L/R is reduced significantly (L being the coil inductance). Some also have an idle current reduction feature that reduces the current through the coils to a lower level so the motors won't easily turn (as they would if you completely turned the current off), but they run cooler.
#L298N MOTOR DRIVER ARDUINO FUNCTION HOW TO#
You need to set the current (see the instruction for how to do that) to something like 1A or 1.1A) and the driver will automatically PWM the power to the motor to keep the current at close to the correct level from idle to maximum speed. Some of them will allow you to increase the supply voltage to 24 or 36V which will give you better performance. You can probably source one of those for not much more than the two power resistors. Or buy a stepper driver that has a current setting and chopper circuit. If you want to try it, you could try 1A or 1.1A, with something like a 6.8 \$\Omega\$ or 7.5 \$\Omega\$resistor on each winding, rated for 10W or so.
To get 2V with a 12V supply, you would need to throw away 10V in the resistors and chip which is really wasteful. You could also lower the supply voltage to about 5V from 12V which would work, but the motor would not be able to accelerate as fast. The cheap L298 modules don't have a chopper or current setting so you have to add a big power resistor in series with each winding if you want relatively high performance.
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