![]() ![]() Now we define a class that will control our DC motor. #define MAX_ANGLE 180 //we will allow our motor to turn by a maximum angle of 180 degrees If PERM_ERROR is very small, the shaft will keep hunting left and right as the //analogRead() of the potentiometer pin keeps fluctuating slightly on the potentiometer shaft causes any real change in the ohmic reading. In my potentiometer, a turn only about 3 degrees #define PERM_ERROR 3 //the max permissible error in degrees. read the pot value and edit #define POT_VALUE_MAX line with your pot reading. Next manually move the motor shaft to 180 degree position, Now read the potentiometer value and edit the #define POT_VALUE_MIN line with your pot reading. To fill up the correct values, first turn the motor shaft manually to 0 degree position. A continuous rotation servo can spin continuously either in a forward or reverse direction, at a speed that you can specify. potentiometer reading when when motor shaft is at 0 degree position. 1 1 Download Favorite By AustinS89 Follow More by the author: Im going to show you how to get started using a continuous rotation servo motor with the Arduino UNO. You will need to fill this value according to your setup.See below. potentiometer reading when motor shaft is at 180 degree position. we will read the potentiometer value on analog pin 5 Fix santa's hand to the motor shaft so that it does not interfere with the potentiometer movement It will be better to fix the SHAFT of the potentiomter to the motor In my video, I fixed the BODY of the potentiometer //to the motor shaft. Now we can read the potentiometer value to get the angle of the motor shaft //Look at my youtube video to see how I did this. Fix the body of the potentiometer to a rigid surface such as the body of the motor, //so that when the motor shaft turns, only the potentiometer shaft turns with it. to do this, otherwise even a slight misalignment may cause trouble. Fix the shaft of the potentiometer to the motor shaft.You might like to use a slightly flexible coupling Arduino code to control angle of a motor shaft using a potentiometer for feedback We also check to make sure that the incoming angle value is not less than 0. We use the data->toInt() function to convert the incoming data to an int, and set the angle of the servo to that value using servo->write(). This is the function that is called whenever servofeed gets a message. The basic idea behind converting a DC motor to servo is to find the position of the shaft and apply a DC voltage to get the Shaft to the expected position. The final chunk of code is the handleMessage function. How to convert a DC motor to a Servo motor: One problem with servos is that they cost a lot more than DC motors. Servos, have few advantages over DC motors: Low Torque: Not practical to use it the drive a toy without gears.Easy to get going, all you need is a power supply.DC motor is very simple to operate, you power it and it rotates in one direction and if you change the polarity of the power it rotates in the opposite directions ![]()
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