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Analog input 'Tare/Zero' Weight Function

e14 Contributor

Hi, I am currently working with a load cell amplifier, the output I have taken to Anal Input A0, I need to 'Tare/Zero' the low weight input value, and subtract that value from further

weighed values.

 

I would like to carry out the 'Tare/Zero' via a push button (one shot) which would store the zero value until the power supply is removed.

 

I would also like to display the zero weight via the 'Monitor' function, in order to proove the 'Tare' function is working every time.

 

I have completed the weighing code of the project. but I am completely stumped on the 'Tare/Zero' stage, I can't find an example of storing or one shot code.

 

I hope you can help to enable me to go forward with the project.

 

Regards,

 

Gordon

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  • 0

    Just paste the sketch into www.pastebin.com and return the link. Its makes it clean for looking at. If you want to get real fancy, select c++ highlighting.

  • 0 in reply to e14 Contributor

    Hi,

    I have joined Pastebin and pasted the code but how do you save it?

  • 0 in reply to e14 Contributor

    Gordon

    You can just paste it here

    There are various options if you click the Advanced Editor in top right, and then select the double chevron

    However none of them do much except the quote.

     

    image

     

    Most people just dump it here, but he developers are meant to be working on a more eligant method.

     

     

    Mark

  • 0 in reply to mcb1

     

    #include <SD.h>

    int CS_pin = 10;
    int pow_pin = 8;
    const int analogInPin = A0;  // Analog input pin that the potentiometer is attached to
    float sensorValue = 0;       // value read from the pot
    int switchState = 0;         // Dat enter push button.
    int led = 9;                // Data transfered LED
    const int buttonPin = 3;     /// the number of the Tare/Zero pushbutton pin
    int buttonState = 0;         /// variable for reading the pushbutton status
    int TareValue;
    int FinalWt;

    void setup() {
        // initialize serial communications at 9600 bps:
      Serial.begin(9600);
      Serial.println("Initializing Card");
      //CS Pin is an output
      pinMode(CS_pin, OUTPUT);
     
      //Card will draw power from Pin 8, so set High
      pinMode(pow_pin, OUTPUT);
      digitalWrite(pow_pin, HIGH);
     
      //Check card is ready
      if(SD.begin(CS_pin))
    {
      Serial.println("Card Failed");
      return;
    }
    Serial.println("Card Ready");

    }
    void loop() {
    // read the Tare input pin:
      buttonState = digitalRead(buttonPin);
      if (buttonState == HIGH){
      int TareValue = analogRead(A0);
      Serial.println (TareValue);
      }
    {
      String dataString = "Results";
     
      //Open a file to write to, only one at a time.
      File dataFile = SD.open("DATAFILE.TXT", FILE_WRITE);
      if(dataFile)
     
      {
        dataFile.println(dataString);
        dataFile.close();
        Serial.println(dataString);
      }
      //else
      {
        // Serial.println("Couldn't access file");
      }
      delay(1000);
      //pinMode(buttonPin, INPUT);
      //int TareValue = analogRead(A0);
      //int FinalWt = sensorValue - TareValue;

      // read the analog in value:
      sensorValue = analogRead(0) / 4.26;(analogInPin);
      sensorValue = sensorValue / 16;
      //sensorValue = analogRead(0) / 0.1024;(analogInPin);
      //sensorValue = sensorValue / 1000;
      pinMode(led, OUTPUT);
     
      switchState = digitalRead(2);
     
      if (switchState == HIGH){
     
      FinalWt = (analogRead(0) - TareValue);
      //int FinalWt = 100 - 25;
      // print the results to the serial monitor:
      Serial.println(FinalWt);
      Serial.print(analogRead(0));
      Serial.print(" weight = " ); 
      Serial.print(sensorValue);
      Serial.print(" lbs/oz");
      ///Serial.print(" K/g");
      Serial.println ();
      digitalWrite(led, HIGH);
      delay(100);               // wait for a 100ms
      digitalWrite(led, LOW);

      // wait 400ms before the next loop
      // for the analog-to-digital converter to settle
      // after the last reading:
      delay(400);                    
      }
      }
    }

Reply
  • 0 in reply to mcb1

     

    #include <SD.h>

    int CS_pin = 10;
    int pow_pin = 8;
    const int analogInPin = A0;  // Analog input pin that the potentiometer is attached to
    float sensorValue = 0;       // value read from the pot
    int switchState = 0;         // Dat enter push button.
    int led = 9;                // Data transfered LED
    const int buttonPin = 3;     /// the number of the Tare/Zero pushbutton pin
    int buttonState = 0;         /// variable for reading the pushbutton status
    int TareValue;
    int FinalWt;

    void setup() {
        // initialize serial communications at 9600 bps:
      Serial.begin(9600);
      Serial.println("Initializing Card");
      //CS Pin is an output
      pinMode(CS_pin, OUTPUT);
     
      //Card will draw power from Pin 8, so set High
      pinMode(pow_pin, OUTPUT);
      digitalWrite(pow_pin, HIGH);
     
      //Check card is ready
      if(SD.begin(CS_pin))
    {
      Serial.println("Card Failed");
      return;
    }
    Serial.println("Card Ready");

    }
    void loop() {
    // read the Tare input pin:
      buttonState = digitalRead(buttonPin);
      if (buttonState == HIGH){
      int TareValue = analogRead(A0);
      Serial.println (TareValue);
      }
    {
      String dataString = "Results";
     
      //Open a file to write to, only one at a time.
      File dataFile = SD.open("DATAFILE.TXT", FILE_WRITE);
      if(dataFile)
     
      {
        dataFile.println(dataString);
        dataFile.close();
        Serial.println(dataString);
      }
      //else
      {
        // Serial.println("Couldn't access file");
      }
      delay(1000);
      //pinMode(buttonPin, INPUT);
      //int TareValue = analogRead(A0);
      //int FinalWt = sensorValue - TareValue;

      // read the analog in value:
      sensorValue = analogRead(0) / 4.26;(analogInPin);
      sensorValue = sensorValue / 16;
      //sensorValue = analogRead(0) / 0.1024;(analogInPin);
      //sensorValue = sensorValue / 1000;
      pinMode(led, OUTPUT);
     
      switchState = digitalRead(2);
     
      if (switchState == HIGH){
     
      FinalWt = (analogRead(0) - TareValue);
      //int FinalWt = 100 - 25;
      // print the results to the serial monitor:
      Serial.println(FinalWt);
      Serial.print(analogRead(0));
      Serial.print(" weight = " ); 
      Serial.print(sensorValue);
      Serial.print(" lbs/oz");
      ///Serial.print(" K/g");
      Serial.println ();
      digitalWrite(led, HIGH);
      delay(100);               // wait for a 100ms
      digitalWrite(led, LOW);

      // wait 400ms before the next loop
      // for the analog-to-digital converter to settle
      // after the last reading:
      delay(400);                    
      }
      }
    }

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