Arduino 'Can't Touch This' Device

1/* Arduino 'Can't Touch This' Device
2
3   Components:
4                -  Arduino Nano
5                - ADXL335
6                - Passive Buzzer
7                - Push button tactile switch
8                - Red LED
9                -  220Ohm resistor
10                - 330Ohm resistor
11                - 10kOhm  resistor
12                - Breadboard
13                - Some jumper wires
14
15   Created on 26 July 2022 by c010blind3ngineer
16*/
17
18int X_axis = A0;
19int  Y_axis = A1;
20int Z_axis = A2;
21const int buzzerPin = 9;
22const int LEDpin  = 8;
23const int btnPin = 7;
24const int deg_acc = 3;
25boolean trigAlarm = false;
26int  x, y, z;
27
28int STILL[4];
29
30void setup() {
31  analogReference(EXTERNAL);
32  pinMode(buzzerPin, OUTPUT);
33  pinMode(LEDpin, OUTPUT);
34  pinMode(btnPin,  INPUT);
35  Serial.begin(9600);
36  while (digitalRead(btnPin) != HIGH) {}
37}
38
39void  loop() {
40  if (digitalRead(btnPin) == HIGH) {
41    Serial.print("Calibrating");
42    delay(500);
43    int i = 0;    // reset 'i' counter
44    while (i < 3) {   // read XYZ readings 3 times, it also gives the User time to stabilise the device  properly
45      Serial.print(".");
46      STILL[0] = analogRead(X_axis);
47      STILL[1] = analogRead(Y_axis);
48      STILL[2] = analogRead(Z_axis);
49      delay(500);
50      i++;
51    }
52    digitalWrite(LEDpin, HIGH);
53    tone(buzzerPin, 2000);
54    delay(100);
55    digitalWrite(LEDpin, LOW);
56    noTone(buzzerPin);
57    delay(100);
58    digitalWrite(LEDpin, HIGH);
59    tone(buzzerPin, 2000);
60    delay(100);
61    digitalWrite(LEDpin, LOW);
62    noTone(buzzerPin);
63    trigAlarm = false;
64  }
65  // Read XYZ axis values
66  x = analogRead(X_axis);
67  y = analogRead(Y_axis);
68  z = analogRead(Z_axis);
69
70  // Check to see if the device is in the same position when the User set it initially
71  if ((x > (STILL[0] - deg_acc)) && (x < (STILL[0] + deg_acc)) && (y > (STILL[1]  - deg_acc)) && (y < (STILL[1] + deg_acc)) && (z > (STILL[2] - deg_acc)) && (z <  (STILL[2] + deg_acc)) ) {
72    // You can uncomment the lines below to see the  XYZ values in the Serial Monitor
73    //    Serial.print(x);
74    //    Serial.print("\	");
75    //    Serial.print(y);
76    //    Serial.print("\	");
77    //    Serial.print(z);
78    //    Serial.println();
79  }
80  else {
81    trigAlarm = true;
82  }
83  // Alarm goes off when someone moves the device out of position
84  if (trigAlarm  == true) {
85    digitalWrite(LEDpin, HIGH);
86    tone(buzzerPin, 2000);
87    delay(100);
88    digitalWrite(LEDpin, LOW);
89    noTone(buzzerPin);
90  }
91  delay(100);
92}
93