Using Millis to turn relay on and off

[UKHeliBob]

You missed a colon out of the address

This works https://create.arduino.cc/projecthub/394412/dosing-peristaltic-pump-pwm-ssr-hx711-scale-and-an-fsm-da9b06

[jimLee]

Try this.

#include "blinker.h"

// So everyone wants newbies to write blink without delay. This is good
// because delay() is bad. Well, here's the simple way to do it..

#define pumpPin   13 // Change this to suit your needs.
#define pumpTime  5.0 * 60.0 * 1000.0   //  5 minutes * 60 sec * 1000 ms -> time in Ms
#define soakTime  2.0 * 60.0 * 60.0 * 1000.0   // 2 hours * 60 min * 60 sec * 1000 ms -> time in Ms

    
// Allocate a global blinker object.
blinker aBLinker(pumpPin,pumpTime,soakTime + pumpTime);        

void setup() {

   // Fire it up.
   aBLinker.setOnOff(true);   
}


void loop() {

   // blinker is an idler. Calling idle() once in loop lets ALL idlers run.
   idle();                    
}

You'll need LC_baseTools from the IDE library manager to make this compile.

-jim lee

[pnorsworthy]

Frustration level high. I have poured over the code to no end. I scrapped everything and started a new. The relay comes on but nothing else. Again, I need this to run, without blocking. Intended to have pump run for 4 minutes and off for 4 hours. This code is just set for 1 second. I have written in Serial print to see how far the code runs. I only get to "PUMP STARTING". Can anyone help me?

const int relayPin = 8;
const int relayInterval = 1000;
const int waterDuration = 1000;
byte relayState = LOW;
unsigned long currentMillis = 0;
unsigned long millis();
unsigned long previousRelayMillis = 0;
void setup() {
Serial.begin(9600);
Serial.println("PUMP STARTING");

pinMode(relayPin, OUTPUT);
}

void loop() {

currentMillis = millis();
}

void relay() {

if (relay == HIGH) {

if (currentMillis - previousRelayMillis >= waterDuration) {
relayState = LOW;
Serial.print("WATERING");
previousRelayMillis += relayInterval;

}
}

else {
if (currentMillis - previousRelayMillis >= waterDuration) {
relayState = HIGH;
Serial.print("PUMP OFF");
previousRelayMillis += waterDuration;
}
}
}

[dougp]

The FSM in this post seems made to order.

[cattledog]

Here is the complete code example of the unequal blink without delay referred to in #1 and #4. The interval switches between the on and off times. Revise as you need.

const byte ledPin =  LED_BUILTIN;// the number of the LED pin

byte ledState = LOW;             
unsigned long previousMillis = 0;     

unsigned long intervalOn = 4*60*1000;  //Four minutes on
unsigned long intervalOff= 4*60*60*1000; //Four hours off
unsigned long interval = intervalOff; //start with pump off

void setup() {
  pinMode(ledPin, OUTPUT); 
}

void loop() {
  
  unsigned long currentMillis = millis();
  
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;

    if (ledState == LOW) {
      ledState = HIGH;
      interval = intervalOn;
    } else {
      ledState = LOW;
      interval = intervalOff;
    }
    digitalWrite(ledPin, ledState);
  }
}

[pnorsworthy]

Thank you everyone for your input and advice. What a great community. My hats off to the folks that offered up the blink method. Wow, it looks so simple I didn't think it would work. But it works flawlessly and is very adaptable. Cheers

[UKHeliBob]

I am glad that you finally took note and that it works for you

Good luck with your project