![]() If you have any questions, feel free to leave a comment below.If you are planning on building a robot with DC motors then you will eventually learn that you need to control both the speed and direction of the motor if you want it to move it in a certain direction. Hope this helps you to use DC motors in your own Arduino projects. Otherwise, the command analogWrite(Tip120, motorSpeed) sends the PWM signal to drive the motor with analogWrite(Tip120, motorSpeed). If motorSpeed is less than motorLimit, Tip120 is set to LOW, turning off the motor and turning ON the LED indicator. The if statement performs a comparison to see if the motorSpeed variable is less than the motorLimit variable. The motorSpeed variable is passed to the analogWrite() function later in the code to create a pulse width modulation (PWM) signal that is sent to the Tip120 pin. ![]() The mapped value is stored in the motorSpeed variable. In the next line, the map() function takes the value stored in speedValand converts it to a value between 0 and 255. It takes the analog voltage applied to speedSet (analog pin A0) and converts it into an integer stored in speedVal. In the sketch above, the variable speedVal will contain an integer from 0 to 1023, depending on the value output by the analogRead() function. LED is set equal to the pin connected to the indicator LED.motorLimit is set equal to a cutoff value that will be used to turn off the motor at slow speeds.motorSpeed is set equal to a number between 0 and 255, which will be passed to the analogWrite() function to drive the motor. ![]()
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