how to stabilize the value??

Projects Programming
1

the value not stable and sometimes got too high value...anybody help :frowning:

void loop()
{
digitalWrite(trigPin1,LOW);//ultrasonic
delayMicroseconds(1);
digitalWrite(trigPin1,HIGH);
delayMicroseconds(1);
digitalWrite(trigPin1,LOW);
digitalRead(trigPin1);
duration = pulseIn(8,HIGH);
cm = (duration/58.2); //change to cm

Serial.print(reading);
Serial.print(" ");
Serial.println(cm);
lcd.setCursor(0,0); //set the cursor to column 0 and line 1
lcd.print("Set(cm)=");
lcd.print(reading);
lcd.setCursor(0,1);
lcd.print("Changes(cm)=");
lcd.print(cm);
delay(100);

val = digitalRead(button);
readingSto = cm;
rst();

2

anybody help

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3

Which one is too high? You have "val" and "cm" as the two main variables you are reading.

How much is too high? Please use a specific number.

4

My sensor which is ultrasonic HC-SR04..
this coding will function through set value.(Button). thus, the set value is ok but the changes value sometimes reach to 100++ and 3000++... is it need a kalman?

#define button 11
#define led 10
#define led2 12

#include<LiquidCrystal.h>

LiquidCrystal lcd(2, 3, 4, 5, 6, 7);
const int trigPin1=9;
const int echoPin1=8;

double distance,cm,inches,duration;

int reading =10;
int val, readingSto;

void setup()
{
lcd.begin(16,2);
lcd.setCursor(0,0);
Serial.begin(9600);
pinMode(trigPin1,OUTPUT);
pinMode(echoPin1,INPUT);
pinMode(button,INPUT);
pinMode(led,OUTPUT);
pinMode(led2,OUTPUT);
digitalWrite(LED_BUILTIN, LOW);
//lcd.print("Ref. Value");
}

void loop()
{
digitalWrite(trigPin1,LOW);//ultrasonic
delayMicroseconds(1);
digitalWrite(trigPin1,HIGH);
delayMicroseconds(1);
digitalWrite(trigPin1,LOW);
digitalRead(trigPin1);
duration = pulseIn(8,HIGH);
cm = (duration/58.2); //change to cm
Serial.print(reading);
Serial.print(" ");
Serial.println(cm);
lcd.setCursor(0,0); //set the cursor to column 0 and line 1
//lcd.print(reading);
lcd.print("Set(cm)=");
lcd.print(reading);
//lcd.print("cm");
lcd.setCursor(0,1);
lcd.print("Changes(cm)=");
lcd.print(cm);
//lcd.print("cm");
delay(100);

val = digitalRead(button);
readingSto = cm;
rst();
cm = cm-5;
if(cm >reading)
{
digitalWrite(led, HIGH);

}
else
{

digitalWrite(led, LOW);
}
/*
if(cm >=100)
{
digitalWrite(led, LOW);
}*/

//}

if(reading >cm )
{
digitalWrite(led2, HIGH);
}
else
{
digitalWrite(led2, LOW);
}

delay(500);
}
void rst()
{
if(val == 0 )
{
digitalWrite(LED_BUILTIN, HIGH);
reading = readingSto;
}
else
{
digitalWrite(LED_BUILTIN, LOW);
reading = reading;
}
}

5 
    reading = reading;

How useful. I wonder why more people don't do that.

6

:slight_smile: :frowning: .....but i don't know to stabilize

7

Your code looked wrong at first glance for the delay on trigger.

Then I found these notes for a working example.
// The sensor is triggered by a HIGH pulse of 10 or more microseconds.
// Give a short LOW pulse beforehand to ensure a clean HIGH pulse: (They used 5 microseconds)

Your code just uses 1 microsecond delays, where did you come up with that?

Trying to stabilize the value starts with making sure your using the sensor correctly first.