Arduino weigh scale, how do tareweight?

Projects General Guidance
1

I'm looking for an easy way to do the zeroing part(tareweight) in a weigh scale sketch. I'm using an ADC and load cell that is producing voltages proportional to the weight. Serial.print(volts,0); is working fine. I want to do a tareweight procedure every time the Arduino scale is powered up. I don't know which method to try. EEPROM.h?avr/eeprom.h? Serial.println(F)? Or a basic programming trick? I need to store the tareweight and use it later to calculate the actual weight (total weight minus tareweight).

2

Take a tare reading in your setup function. That is executed once after ever reset. Them subtract the tare reading from further readings.

int tare;
int weight;

void setup(){
  Serial.begin(115200);
  tare = analogRead(0);
  Serial.print("tare: ");
  Serial.println(tare);
}//setup()

void loop(){
  weight = analogRead(0)-tare;
  Serial.println(weight);
  delay(500);
}//loop()
3

The sketch remembers things in variables, as shown by nilton above.

You might also store the value printed and not print again until it changes. Otherwise that code will print over and over every half second.