How do I change the speed of a DC motor in Arduino?
Pin IN1 of the IC L298 is connected to pin 8 of Arduino while IN2 is connected to pin 9. These two digital pins of Arduino control the direction of the motor. The EN A pin of IC is connected to the PWM pin 2 of Arduino. This will control the speed of the motor.
How can we reduce rpm of DC motor?
A couple of things you can do:
- Use gears to change ratio of speed, which is what you’re going to do.
- Use a stepper motor, which are commonly used for high-torque, low RPM applications.
- Find some sort of PWM control circuit to slow it down, although you probably won’t be able to get it down to 5-10RPM.
How can we change the speed of a DC motor is for?
Thus, the speed of a DC motor can be controlled in three ways:
- By varying the supply voltage.
- By varying the flux, and by varying the current through the field winding.
- By varying the armature voltage, and by varying the armature resistance.
How to control motor speed with analogwrite ( )?
1 analogWrite () can take values between 0 and 255 as its second parameter. Where 255 will give you the maximum motor speed and 0 will give you the lowest (motor will not run). For example, below code will give you almost the half of max speed.
How to control the speed of a DC motor on Arduino?
This function takes a value between 0 and 255 and doesn’t work on all pins in Arduino. In Arduino Uno, it works on pins 3, 5, 6, 9, 10 and 11. To control the speed of the motor, all we need to do is to replace digitalWrite function on L293D enable pins to analogWrite.
What is the analog write function in Arduino?
Before we go ahead, we need to know about analogWrite function in Arduino. In Arduino, the analogWrite function allows you to generate a PWM wave in a pin. If you have tried out the LED fade example in Arduino, then you already know how to use it.
How can I change the speed of a DC motor?
The value you pass to analogWrite function will decide the speed of the motor. Here is the modified sketch that you can use to change the direction as well as the speed of the DC motors. I have encapsulated the logic of changing directions of DC motors in an Arduino library called DCMotorBot.