Weighing-scale arduino code

weighing-scale/weighing-scale.ino

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+// Task: Signal Conditioning and Weight Calculation Code for Vintage-Style Weighing Scale.
+
+// Input:
+//  - Analog sensor readings from the Velostat-based transducer.
+
+// Output:
+//  - Servo motor control signals for positioning the vintage-style display,
+//  - Weight values displayed through the Arduino Serial Monitor.
+
+// Author: Maryne Dey and Alexandre Verot (maryne.dey@ecam.fr and alexandre.verot@ecam.fr)
+// Created: 2023-05-15
+
+#include <Servo.h>
+#include <math.h>
+
+Servo myservo;  // create servo object to control a servo
+
+int potpin = 0;  // analog pin used to connect the potentiometer
+float val;    // variable to read the value from the analog pin
+float meanValue;
+float val2;    // variable to read the value from the analog pin
+float meanValue2;
+int i = 0;
+int n = 10;
+float array[10];
+int voltage;
+double weight;
+
+void setup() {
+  myservo.attach(3);  // attaches the servo on pin 9 to the servo object
+  Serial.begin(9600);
+}
+
+void loop() {
+//filter using the average of the last n values
+  while (i < n){
+    val = analogRead(potpin);
+    array[i] = val;
+    i++;
+  }
+  int sum = 0;
+  for (int j = 0; j < n; j++) {
+    sum += array[j];  // Add each element to the sum
+  }
+  meanValue = sum/n;
+
+//send the values to the servo motor
+  meanValue = map(meanValue, 0, 620, 0, 180);     // scale it to use it with the servo (value between 0 and 180)
+  myservo.write(meanValue);                  // sets the servo position according to the scaled value
+
+//filter using the average of the last n values
+  while (i < n){
+    val2 = analogRead(potpin);
+    array[i] = val;
+    i++;
+  }
+  int sum2 = 0;
+  for (int k = 0; k < n; k++) {
+    sum2 += array[k];  // Add each element to the sum
+  }
+  meanValue2 = sum2/n;
+
+//display the weight
+  meanValue2 = map(meanValue2, 0, 1023, 0, 500); //output is in centi volts to be able to reach decimal values 
+  weight = -83.734*pow(meanValue2/100,3) + 578.89*pow(meanValue2/100,2) - 1353.2*meanValue2/100 + 1100.2;
+  Serial.println(weight);
+
+//delay to clearly see the weight and avoid oscillating
+  delay(500);
+  i=0;
+}