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Seting up motor on limit switches

Vallka

Hello, I am new to all this but am learning and really enjoying it.

I have been working on a project to turn a machine with a motor for a time period then stop and wait for a tiime period then repeat.

This is not working out so I want to change the plan and make it work on a button/motion sensor and limit switches.

This is the code I have and I had alot of help from others on this.

Ideally you would push a button, the motor would run for a time period or hit limit swich then reverse for a time period and stop until button pushed again.

This is the code I have.

// run forwards for 10sec
// stop for 2sec
// reverse for 10sec,
// stop for 3min
// repeat the loop endlessly.

int r_en = 2;
int l_en = 3;
int r_pwm = 5;
int l_pwm = 6;



void setup() {
pinMode(r_en, OUTPUT);
pinMode(l_en, OUTPUT);
pinMode(r_pwm, OUTPUT);
pinMode(l_pwm, OUTPUT);
}
void loop() {
forward();
delay(10000);
stop();
delay(2000); 
reverse();
delay (10000);
stop();
delay (3 * 60 * 1000); 
}

void stop() {
analogWrite(r_pwm, 0);
analogWrite(l_pwm, 0);
digitalWrite(r_en, LOW); // disable r motor
digitalWrite(l_en, LOW); // disable l motor
}

void forward() {
analogWrite(r_pwm, 150);
analogWrite(l_pwm, 0);
digitalWrite(r_en, HIGH); // enable motor r
digitalWrite(l_en, HIGH); // enable motor l
}

void reverse() {
analogWrite(r_pwm, 0);
analogWrite(l_pwm, 150);
digitalWrite(r_en, HIGH); // enable motor r
digitalWrite(l_en, HIGH); // enable motor l
}

Parents

  • I'm assuming you want to add two more input to control the flow of motor instead of coding the sequence to run one event after another.

    Below is the rough idea of how to implement it.

    void process_motor()
{
	static int time_passed = 0;
	// Set limit switch and button as external trigger input
	if (button_press_action)
	{
		time_passed = millis();
		forward();
		while (millis() - time_passed < 10000 && !limit_switch_action)
		{
			// Do nothing here
		}
		stop();
	}
	if (limit_switch_action)
	{
		time_passed = millis();
		reverse();
		while (millis() - time_passed < 10000 && !button_press_action)
		{
			// Do nothing here
		}
		stop();
	}
}

  • in reply to balajivan1995

    Ok I kinda get this, would I need switches that are NO or NC?

  • in reply to Vallka

    They can be either one. Your code is what decides how it reacts. Like I had noted before, you can start with a blank sketch just to test switch input. Once you’ve got that figured out, roll it into your main code.

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