Off delay for motor

Projects Programming
1

Hi,

I've been working on a motor that should stop after 10 seconds. I want to use Arduino for this.

I've picked up a code from the forum but it works counterwise....

The code:

const byte inputPin = A1;
const byte ledPin = 13;
unsigned long startTime;
unsigned long currentTime;
unsigned long period = 5000;  //adjust to change period
byte currentButtonState = HIGH;
byte previousButtonState = HIGH;
boolean timing = false;

void setup()
{
  Serial.begin(115200);
  pinMode(inputPin, INPUT_PULLUP);  //input will he HIGH when not pressed
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, HIGH); //turn off the LED
}

void loop()
{
  currentTime = millis();
  if (!timing)  //only react to input if not already timing
  {
    previousButtonState = currentButtonState;
    currentButtonState = digitalRead(inputPin);
    if (currentButtonState != previousButtonState & currentButtonState == LOW)  //button has become pressed
    {
      digitalWrite(ledPin, LOW);  //turn on the LED
      startTime = millis();
      timing = true;
    }
  }
  else if (currentTime - startTime >= period)
  {
    digitalWrite(ledPin, HIGH); //turn off the LED
    timing = false;
  }
}
2

wouter-helek:
it works counterwise....

What does that mean?

Is your button wired from the pin to ground, as required by the pinMode as input pullup in the code?

3

the compiler suggested parenthesis around the individual tests and I believe you want a logical AND (&&) not a bitwise AND (&)

        if ((currentButtonState != previousButtonState)
            && (currentButtonState == LOW))  //button has become
4

finola_marsaili:
What does that mean?

Is your button wired from the pin to ground, as required by the pinMode as input pullup in the code?

Yes, it is. But if I test it, de LED stays on until I push the button. Than it shuts down for a certain time and goes back on. It should word the other way. Go on for a certain time if I push the button and than go back out...

5

How's the led wired then?

If the led has its anode on the digital pin and cathode (the flat side of the "bulb") to ground, a high on the pin is on.

If the led has its anode to 5V and cathode to digital pin, a low on the pin is on.