[Help] With Check Weigher Simple Project

Projects General Guidance
1

First of all this is my first time on Arduino Forums and it is only few weeks since i started to learn about Arduino programming :smiley: :smiley: .

So i wanted to improve my skills with this simple project about a small weighing scale with a relay output ( LED or a Buzzer .....etc ) .

Components are :

1- LCD 2 X 16

2- Keypad 4 X 4

3- Arduino Mega 2560

4- 5 KG Load Cell

5- 5 V Output Relay

6- HX711 Amp

7- Push button ( pin # 10 )

Lets say i want to enter 2 variables( Weight range ) with my 4x4 keypad and it is displayed on LCD 2 x 16 and if

press # it confirms or * to reset inputs

assuming that the two variables are X =195 grams and Y = 200 grams so if i put something more than

200 grams or less than 195 grams on the load cell i get an output on my relay

The Problem is i can't figure out how to write this a code for a way to make my LCD and Keypad to ask the user to

enter the 2 variables and then the program is executed.

The Code i am trying to use it is not completed yet and still missing some lines

#include "HX711.h"
#include <LiquidCrystal.h>
#include <Keypad.h> 
#define CLK A0
#define DOUT A1
#define calibration_factor 1000.0
HX711 scale;
const byte ROWS = 4; 
const byte COLS = 4; 
char keys[ROWS][COLS] = {
  {'1','2','3','A'} ,
  {'4','5','6','B'} ,
  {'7','8','9','C'} ,
  {'*','0','#','D'}
    };
byte rowPins[ROWS] = {  9,8,7,6 };
byte colPins[COLS] = { 5,4,3,2, };
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
LiquidCrystal lcd(13, 12,45,46,47,48);
int relayPin=33;
int resetPin = 10;
float weight;

void setup() {
  lcd.begin(16, 2);
  lcd.print("Initializing...");
  delay(100);

  pinMode(resetPin, INPUT);

  scale.begin(DOUT, CLK);
  scale.set_scale(calibration_factor);
  scale.tare();                           // reset weight on scale to 0 grams

  lcd.clear();
}

void loop() {
  weight = scale.get_units();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Weight:");
  lcd.setCursor(0, 1);
  lcd.print(weight);
  lcd.print("  gm");
 
  if(digitalRead(resetPin) == 0){
    scale.tare();     // reset weight on scale to 0 grams
  }

   if(weight<195){digitalWrite(relayPin,HIGH);}
  else{digitalWrite(relayPin,LOW);}
  if(weight>200){digitalWrite(relayPin,HIGH);}
  else{digitalWrite(relayPin,LOW);}
}

To be honest i searched on google for any sources or topics with the same project before posting this but didn't help :smiley: :smiley:

2

One way to, being new as You are, is to use example code provided "here and everyware" for each device. Start to make Yourself familiar with Arduino and display. Then Arduino and keyboard etc.

Then You can start to integrate the different subsystems together, one by one.
Connecting all and then starting to work is the most difficult way to go, I'll say hopeless.

3

Railroader:
One way to, being new as You are, is to use example code provided "here and everyware" for each device. Start to make Yourself familiar with Arduino and display. Then Arduino and keyboard etc.

Then You can start to integrate the different subsystems together, one by one.
Connecting all and then starting to work is the most difficult way to go, I'll say hopeless.

Thanks for your answer , would you mind recommending me any tutorials or any materials that might be useful for me ? :smiley:

4

ahmedabozaid:
Thanks for your answer , would you mind recommending me any tutorials or any materials that might be useful for me ? :smiley:

There are several tutorial/intro links pinned at the top of each topic. Mucho good information therein. You'll especially need to be comfortable with doing more than one thing at a time and timing with millis().