Contamination Alarm for Pipette Tip Box

1const int resistorPin = A0;
2const int buzzerPin = 6;
3int readings[]
4  = {0,0,0,0,0,0,0,0,0,0};
5int notes[] = {350,400,450,500,550,600,650,700,750,800};
6int
7  index = 0;
8const int threshold = 50; 
9const unsigned long waitTime = 10000;
10  //adjust this variable to change the time delay before alarm (currently 10 seconds)
11  
12unsigned long currentTime;
13unsigned long startTime; 
14bool openLid = false;
15void
16  setup() {
17  // put your setup code here, to run once:
18  Serial.begin(9600);
19}
20
21void
22  loop() {
23  // put your main code here, to run repeatedly:
24  int totalReading
25  = 0;
26  readings[index] = analogRead(resistorPin);
27  for(int i=0;i<10;i++){
28
29    totalReading = totalReading + readings[i];
30  }
31  if(totalReading > threshold){
32
33    if(openLid == false){
34    startTime = millis();
35    openLid = true;
36
37    } else {
38      currentTime = millis();
39      if(currentTime - startTime
40  > waitTime){
41          tone(buzzerPin,notes[index]);
42          delay(15);
43
44      }
45    }
46  }else{
47    noTone(buzzerPin);
48    openLid = false;
49
50  }
51  Serial.println(totalReading);
52  index++;
53  if(index >9){
54    index
55  = 0;
56  }
57}
58

1const int resistorPin = A0;
2const int buzzerPin = 6;
3int readings[]  = {0,0,0,0,0,0,0,0,0,0};
4int notes[] = {350,400,450,500,550,600,650,700,750,800};
5int  index = 0;
6const int threshold = 50; 
7const unsigned long waitTime = 10000;  //adjust this variable to change the time delay before alarm (currently 10 seconds)  
8unsigned long currentTime;
9unsigned long startTime; 
10bool openLid = false;
11void  setup() {
12  // put your setup code here, to run once:
13  Serial.begin(9600);
14}
15
16void  loop() {
17  // put your main code here, to run repeatedly:
18  int totalReading  = 0;
19  readings[index] = analogRead(resistorPin);
20  for(int i=0;i<10;i++){
21    totalReading = totalReading + readings[i];
22  }
23  if(totalReading > threshold){
24    if(openLid == false){
25    startTime = millis();
26    openLid = true;
27    } else {
28      currentTime = millis();
29      if(currentTime - startTime  > waitTime){
30          tone(buzzerPin,notes[index]);
31          delay(15);
32      }
33    }
34  }else{
35    noTone(buzzerPin);
36    openLid = false;
37  }
38  Serial.println(totalReading);
39  index++;
40  if(index >9){
41    index  = 0;
42  }
43}
44