Auto Refilling Water Tank with Solenoid Valve and Ultrasonic Sensor

[anon11537946]

Hi I'm new user. I want to make an automate refilling water tank using ultrasonic sensor HC SR04 to defined the distance and using solenoid valve as an actuator. I want to use millis but i still confused how to used it. Here's I attached the code
'
const int trigPin = 4;
const int echoPin = 5;
const int waterRelayPin = 8;

unsigned long duration, distance;
unsigned long currentMillis = millis();
unsigned long distanceMillis;

bool Flag = false;

void setup()
{
pinMode(trigPin, OUTPUT);
digitalWrite(trigPin, LOW);

pinMode(waterRelayPin, OUTPUT);

pinMode(echoPin, INPUT);
Serial.begin(9600);
}

void loop()
{
if (millis() - distanceMillis > 500)
{
distanceMillis = millis();

Distance();

}
if(Flag == false && distance <= 30)
{
Flag = true;
Serial.println("Water Pump : ON");
digitalWrite(waterRelayPin, LOW);
previousMillis = millis();
}

else
{
Flag = false;
Serial.println("Water Pump : OFF");
digitalWrite(waterRelayPin, HIGH);
}
}

void Distance()
{
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);
distance = duration * 0.034 / 2;
int percentage = map(distance, 24, 6, 0, 100);

if(percentage < 0){
percentage = 0;
}
else if(percentage > 100){
percentage = 100;
}

Serial.print("Water Level: ");
Serial.println(percentage);

}'

[pert]

I moved your topic to an appropriate forum category @anon11537946.

In the future, please take some time to pick the forum category that best suits the subject of your topic. There is an "About the _____ category" topic at the top of each category that explains its purpose.

This is an important part of responsible forum usage, as explained in the "How to get the best out of this forum" guide. The guide contains a lot of other useful information. Please read it.

Thanks in advance for your cooperation.

[StefanL38]

Hi @anon11537946

welcome to the arduino-forum.
You should re-edit your first posting using this method.
Scroll down to the section RE-editing a posting

Make experienced users help: two ways to quickly post code as a code-section

Hi newcomer, This thread wants to show you how you can speed-up getting helpful answers with small effort. If you manage at least to post this way. You have the sympathy of the experienced users. If you are willing to invest another 20 minutes these 20 minutes extra-time will save you a minimum of 200 minutes to finish your project. always post your full sketch. As a code-section from the very first to the very last line A code-section has a small height => keeps your posting "short" but…

If you have re-edited your posting that the code is shown as a code-section
I will answer your questions
best regards Stefan

[StefanL38]

@anon11537946

I want to use millis but i still confused how to used it.

You are one of more than a thousand users that have this problem.

This problem is caused by three things:

1. not emphasizsing the very different nature of non-blocking timing based on millis() to using delay()
2. a poor documented and poor written demo-code
3. lack of an everyday analogy with easy to understand example-numbers

I claim to have written a tutorial that does it better.

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 princip…

best regards Stefan

[paulpaulson]

@anon11537946

I want to use millis but i still confused how to used it.

Hello lalakur

Take a view here to get proper started:

Blink Without Delay | Arduino Documentation

Have a nice day and enjoy coding in C++.

[anon11537946]

Thank you so much for your help. It helps me a lot to understand it easily @StefanL38 @paulpaulson

[hammy]

You don’t need an Arduino for such a simple task .
Just use a float switch to turn the pump on/off or go old school with a ball cock arrangement.