Millis timer help

[gitpeke]

Hi,

I'm trying to use 3 timers in a project I'm doing. The first turns on a sensor, and the second turns it off. I have this section working but the third timer is the issue.

If the sensor is within a certain value range an output goes HIGH. The third timer is supposed to then set it LOW. Much like the first 2 timers

any help would be appreciated

const unsigned long DELAY_TIME = 10000;
const unsigned long DELAY_TIME1 = 1000;
const unsigned long DELAY_TIME2 = 2000;

unsigned long moisture_timer, moisture_on, solnoid_on = 0;

void setup() {
  Serial.begin(9600);

  for (int i = 5; i > 0; i--) { // just to give a little time before it all starts
    delay(1000);
    Serial.print(i); Serial.print(' ');

  }
  Serial.println();


  pinMode(2, OUTPUT);// the power source for the moisture sensor
  pinMode(3, OUTPUT); // signal for the latch relay

  digitalWrite(2, LOW);// sets the pin to 0V
  digitalWrite(3, LOW); //sets the pin to 0V

  moisture_timer =  moisture_on  = solnoid_on = millis();

}

void loop() {
  Serial.println(analogRead(A0));

  if (millis() - moisture_timer > DELAY_TIME) {
    if (digitalRead(2) == LOW) {
      moisture_on = millis();
    }
    digitalWrite(2, HIGH);

    if (millis() - moisture_on > DELAY_TIME1) {
      digitalWrite(2, LOW);
      moisture_timer = millis();
    }

    if (analogRead(A0) <= 500 && analogRead(A0) >= 1) {
      digitalWrite(3, HIGH);
    }

    if (millis() - solnoid_on > DELAY_TIME2) {
      digitalWrite(3, LOW);
      solnoid_on = millis();

    }
  }

}

[DrDiettrich]

Read a bit about state machines. You should check first in which state your device actually is. Only then check the appropriate delay whether to take an action.

[b707]

try this instead of your two last conditions

if (millis() - solnoid_on > DELAY_TIME2) {
      digitalWrite(3, LOW);
      if (analogRead(A0) <= 500 && analogRead(A0) >= 1) {
          digitalWrite(3, HIGH);
          solnoid_on = millis();
       }      
    }

[paulpaulson]

Hello gitpeke
I could be easy when some comments for the functionality of the sketch would be added.
Provide functional names for the port pins in use.

[StefanL38]

tutorial about state-machines

A Demo-Code explaining the switch-case state-machine and how to do things (almost) in parallel

Hi everybody, if you look at the end of this first posting you see a list of links that show where this tutorial was used as a link. Go through this list to find additional information on how to apply this code This democode requires only the pure microcontroller without any hardware. You just open the serial monitor to watch the behaviour of the code. From time to time I enjoy writing demo-codes that want to explain programming-functionalities. There are a lot of different approachs to expl…

[b707]

Colleagues, I don’t think that state machines are needed here, as far I understand all three timers are independent of each other

[StefanL38]

tutorial easier to understand and easier to apply than the standard BWD

Example-code for timing based on millis() easier to understand through the use of example-numbers / avoiding delay()

non-blocking timing. Execute code only from time to time. There are a lot of different ways to learn programming. This thread wants to add another approach that is different to the yet existing ones. UPDATE 06.01.2023 if you are mainly interested in applying non-blocking timing you can do a quick read of this short tutorial / demonstration If you are intersted in understanding the details how it works go on reading here. I use an everyday analogon in this post to explain the basic principle …