relay codes

Projects Programming
1

i have a problem , i need help from here
i need to switch relay but stays on
but its blinking ,, dont know how to stop those blinking

i have 3 relays
2nd , 3rd relays have to switch on
after 2 sec the 2nd relay turn off & 1st relay1 turn on
finally rly1 & rly3 stay on,,, but 2nd rly blinking
is there anyone to help me,,,???

i need help from here :confused: :confused: :confused:

#include <Wire.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>

#define I2C_ADDR 0x3F // <<----- Add your address here. Find it from I2C Scanner
#define BACKLIGHT_PIN 3
#define En_pin 2
#define Rw_pin 1
#define Rs_pin 0
#define D4_pin 4
#define D5_pin 5
#define D6_pin 6
#define D7_pin 7
#define trigPin 12
#define echoPin 13
LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);

int Relay1 = 7;
int Relay2 = 8;
int Relay3 = 9;

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

pinMode(Relay1, OUTPUT);
digitalWrite(Relay1,HIGH);

pinMode(Relay2, OUTPUT);
digitalWrite(Relay2, HIGH);

pinMode(Relay3, OUTPUT);
digitalWrite(Relay3, HIGH);

lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
lcd.setBacklight(HIGH);
lcd.begin (16,2);

}

void loop() {

float duration, distance;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);

digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);
distance = (duration / 2) * 0.0344;

if (distance >= 150 || distance <= 2){
lcd.print("Out of range");
Serial.print("Out of range");
lcd.setCursor(0,1);
delay(500);
digitalWrite(Relay2, LOW);
digitalWrite(Relay3, LOW);
delay(1000);
digitalWrite(Relay2, HIGH);
digitalWrite(Relay1, LOW);

}else {
lcd.print("WATER LEVEL");
lcd.setCursor(0,1);
digitalWrite(Relay2, HIGH);
digitalWrite(Relay3, HIGH);
digitalWrite(Relay1, HIGH);

lcd.print(distance);
lcd.print(" cm");
delay(500);
}
delay(500);
lcd.clear();

}

original_copy.ino (1.57 KB)

2 
#define D7_pin  7

LiquidCrystal_I2C  lcd(I2C_ADDR, En_pin, Rw_pin, Rs_pin, D4_pin, D5_pin, D6_pin, D7_pin);

int Relay1 = 7;

You seem to be trying to use pin 7 for 2 different things at the same time. What is connected to it ?

By the way, naming pin 7 as D7_pin is not exactly helpful, is it ?

3

pin 7 connected to relay 1 :slight_smile: :slight_smile:
itz conflict ?

4

pin 7 connected to relay 1

...and to the LCD

Please remember to use code tags when posting code

5

im sorry for code tags

how to correct the pin for lcd,,,?? tq

6

Find another pin that isn't being used.

7

satiya:
im sorry for code tags

how to correct the pin for lcd,,,?? tq

Use a different (currently unused) pin for either the relay or the LCD

8

yeah thank you...nw i changed

but it still blinking :frowning: :frowning:
how to post with code tags,,,tq

#include <Wire.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>

#define I2C_ADDR 0x3F // <<----- Add your address here.
#define BACKLIGHT_PIN 3
#define En_pin 2
#define Rw_pin 1
#define Rs_pin 0
#define D4_pin 4
#define D5_pin 5
#define D6_pin 6
#define D7_pin 7
#define trigPin 12
#define echoPin 13
LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);

int Relay1 = 10;
int Relay2 = 8;
int Relay3 = 9;

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

pinMode(Relay1, OUTPUT);
digitalWrite(Relay1,HIGH);

pinMode(Relay2, OUTPUT);
digitalWrite(Relay2, HIGH);

pinMode(Relay3, OUTPUT);
digitalWrite(Relay3, HIGH);

lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
lcd.setBacklight(HIGH);
lcd.begin (16,2);

}

void loop() {

float duration, distance;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);

digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);
distance = (duration / 2) * 0.0344;

if (distance >= 150 || distance <= 2){
lcd.print("Out of range");
Serial.print("Out of range");
lcd.setCursor(0,1);
delay(500);
digitalWrite(Relay2, LOW);
digitalWrite(Relay3, LOW);
delay(1000);
digitalWrite(Relay2, HIGH);
digitalWrite(Relay1, LOW);

}else {
lcd.print("WATER LEVEL");
lcd.setCursor(0,1);
digitalWrite(Relay2, HIGH);
digitalWrite(Relay3, HIGH);
digitalWrite(Relay1, HIGH);

lcd.print(distance);
lcd.print(" cm");
delay(500);
}
delay(500);
lcd.clear();

}

9

Are you getting "Out of range" prints while blinking?
HowToPostCode

10

yeah....when " out of range " the relays should pickup,,, but i dont know why the blink ...
mayb loop cycle?

11

Hi,
Welcome to the forum.

Please read the first post in any forum entitled how to use this forum.
http://forum.arduino.cc/index.php/topic,148850.0.html then look down to item #7 about how to post your code.
It will be formatted in a scrolling window that makes it easier to read.

Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?

Thanks.. Tom.. :slight_smile:

12 
  if (distance >= 150 || distance <= 2) {
      lcd.print("Out of range");
      Serial.print("Out of range");
      lcd.setCursor(0,1);
      delay(500);
      digitalWrite(Relay2, LOW);
      digitalWrite(Relay3, LOW);
      delay(1000);
      digitalWrite(Relay2, HIGH);
      digitalWrite(Relay1, LOW);
   }else....

Can you see why - if distance is out of range - that Relay2 will click on and off?
... and curiously, why do you set the cursor position AFTER you print to the LCD ?

13

but i delete tat code & i let it runs but it still keep the same blinking ,,wont stay on

14

As asked, post your diagram how everything is connected. Photo/scan of handdrawn one is fine.

And as you're using a I2C lcd, the D7 pin should not conflict.