Control a motor with a button

Question

Code:

int motorPin = 9; // the pin the motor is connected to
void setup()
{
 pinMode(motorPin, OUTPUT); 
}
void loop() 
{
 motorOnThenOff(); //motorAcceleration
}
void motorOnThenOff(){
 int onTime = 2500; //the number of milliseconds for the motor to turn on for
 int offTime = 1000; //the number of milliseconds for the motor to turn off for
 digitalWrite(motorPin, HIGH); // turns the motor On
 delay(onTime); // waits for onTime milliseconds
 digitalWrite(motorPin, LOW); // turns the motor Off
 delay(offTime); // waits for offTime milliseconds
}
void motorOnThenOffWithSpeed(){
 int onSpeed = 200; // a number between 0 (stopped) and 255 (full speed) 
 int onTime = 2500; //the number of milliseconds for the motor to turn on for
 int offSpeed = 50; // a number between 0 (stopped) and 255 (full speed) 
 int offTime = 1000; //the number of milliseconds for the motor to turn off for
 analogWrite(motorPin, onSpeed); // turns the motor On
 delay(onTime); // waits for onTime milliseconds
 analogWrite(motorPin, offSpeed); // turns the motor Off
 delay(offTime); // waits for offTime milliseconds
}
void motorAcceleration(){
 int delayTime = 50; //milliseconds between each speed step
 //Accelerates the motor
 for(int i = 0; i < 256; i++){ //goes through each speed from 0 to 255
 analogWrite(motorPin, i); //sets the new speed
 delay(delayTime); // waits for delayTime milliseconds
 }
 //Decelerates the motor
 for(int i = 255; i >= 0; i--){ //goes through each speed from 255 to 0
 analogWrite(motorPin, i); //sets the new speed
 delay(delayTime); // waits for delayTime milliseconds
 }
}

This code spins the motor. In the circuit, I have a button which I want to toggle the spinning of the motor.

This is the circuit:

https://circuits.io/circuits/4267039-spin-motor-spin/edit

How would I make it so that the button toggles the spinning of the motor? like a fan and its switch?

Answer 1

add this variable at the top of your program:

const int buttonPin = XX; // the pin for the button
bool bState = false;

in the setup() function:

pinMode(buttonPin, INPUT_PULLUP); 
// in case INPUT_PULLUP is not defined, comment the above line and uncomment below
//pinMode(buttonPin, INPUT);
//digitalWrite (buttonPin, HIGH); // enable internal pull-up

in the loop() function, change your code with this:

update_bState();
if (bState) { digitalWrite(motorPin, HIGH); }
else { digitalWrite(motorPin, LOW); }

then, at the end of your program, add the getButton function:

void update_bState(void)
{
 static bool buttonDone = false;
 static uint16_t timeButton;
 if (!digitalRead(buttonPin))
 {
 if ((!buttonDone) && ((uint16_t) (millis() - timeButton) > 100))
 { // Do once when button is pressed for at least 100ms (debounce)
 bState ^= true; // Toggle button state
 buttonDone = true;
 }
 }
 else
 {
 buttonDone = false;
 timeButton = millis();
 }
}

Now that all the work is done, you should add acceleration when launching and deceleration when launching and stopping :D

By the way, I did not tested any code, so there may be some typo errors...

• SMFSW: Yes I do, first line I tell to add in the loop
• Mark Smith: I beg your pardon, so you do
• SMFSW: No problem. I checked, I could have forgotten something.
• SMFSW: @Muhammad Did you notice that the button is initialized as INPUT_PULLUP? This enables internal microcontroller pull-up resistor for the pin, thus avoiding the use of external pull for the button.
• SMFSW: @Muhammad depending your board definitions or arduino version, INPUT_PULLUP may not be defined. In this case, pinMode(buttonPin, INPUT); digitalWrite(buttonPin, HIGH); should work. Writing a 1 to an input declared pin turns the internal pull-up on.