arduino code to output a value (dcSpeed) to a DC motor

Projects General Guidance
1

Code to:
output a value (dcSpeed) to a DC motor that is connected to digital pin 10 of the Arduino, keeping into consideration, that this pin should give a ‘pulse-width modulated’ (PWM) output that switches rapidly between +0V and +5V to give the effect of a voltage that can vary continuously between these values

2

No complete code. The function you're looking for is analogWrite.

3

so thats the function that needs to be used..what do you mean by theres no complete code?

4

preethi16:
so thats the function that needs to be used..what do you mean by theres no complete code?

That was a hint for you to write it yourself unless you think that someone else should do your assignment.

5

And just to give a heads up, the output of analogWrite should be used to feed a motor driver, and should not be connected directly to the motor.
Most motors pull much more current that the arduino pins can provide.

6

To output a value (dcSpeed) to a DC motor that is connected to digital pin 10 of the Arduino, keeping into consideration, that this pin should give a 'pulse-width modulated' (PWM) output that switches rapidly between +0V and +5V to give the effect of a voltage that can vary continuously between these values:

the code i got was:

// Connect the base of the transistor to pin 10.
// Even though it's not directly connected to the motor,
// we'll call it the 'motorPin'
const int motorPin = 10;

void setup()
{
pinMode(motorPin, OUTPUT); // set up the pin as an OUTPUT
Serial.begin(9600); // initialize Serial communications
}

void loop()
{ // This basically replicates a blink, but with the motorPin instead.
int onTime = 3000; // milliseconds to turn the motor on
int offTime = 3000; // milliseconds to turn the motor off

analogWrite(motorPin, 255); // turn the motor on (full speed)
delay(onTime); // delay for onTime milliseconds
analogWrite(motorPin, 0); // turn the motor off
delay(offTime); // delay for offTime milliseconds
}

Is this correct? Confused as to where the variable 'dcspeed' comes in the code though

7

It appears the variable dcspeed should have the values 0 or 255.

Please remember to use code tags when posting code.

8

i see.. but how should that be written in the code? like is it supposed to be written like:

int dcspeed = 0;
int dcspeed = 255;

?

9

Yes it could be written like that, though in code tags, but you'd need to be sure which instance of dcspeed was in scope.

10

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