Build a Working Touchscreen at Home

1#define LED_PIN_RED 7
2#define LED_PIN_BLUE 8
3#define LED_PIN_YELLOW 9
4#define LED_PIN_GREEN 10
5
6#define TOP_LAYER_INPUT A0
7
8#define X_ACCESS_V 2
9#define X_ACCESS_G 3
10
11#define Y_ACCESS_V 4 
12#define Y_ACCESS_G 5
13
14void setup() {
15  Serial.begin(115200);
16
17  pinMode(LED_PIN_RED, OUTPUT);
18  pinMode(LED_PIN_BLUE, OUTPUT);
19  pinMode(LED_PIN_YELLOW, OUTPUT);
20  pinMode(LED_PIN_GREEN, OUTPUT);
21
22  pinMode(TOP_LAYER_INPUT, INPUT);
23
24  pinMode(X_ACCESS_V, INPUT);
25  digitalWrite(X_ACCESS_V, LOW);
26
27  pinMode(Y_ACCESS_V, INPUT);
28  digitalWrite(Y_ACCESS_V, LOW);
29
30  pinMode(X_ACCESS_G, INPUT);
31  digitalWrite(X_ACCESS_G, LOW);
32
33  pinMode(Y_ACCESS_G, INPUT);
34  digitalWrite(Y_ACCESS_G, LOW);
35}
36
37void loop() {
38
39  pinMode(X_ACCESS_V, OUTPUT);
40  digitalWrite(X_ACCESS_V, HIGH);   // 5 V
41
42  pinMode(X_ACCESS_G, OUTPUT);
43  digitalWrite(X_ACCESS_G, LOW);    // 0 V / ground
44
45  delay(50);
46
47  int X_Voltage = analogRead(TOP_LAYER_INPUT); 
48
49  pinMode(X_ACCESS_V, INPUT);
50  digitalWrite(X_ACCESS_V, LOW);
51
52  pinMode(X_ACCESS_G, INPUT);
53  digitalWrite(X_ACCESS_G, LOW);
54
55  
56  //Serial.print("X voltage: ");
57  //Serial.println(X_Voltage);
58
59  //------------------------------------------------------------------------------------------
60
61  pinMode(Y_ACCESS_V, OUTPUT);
62  digitalWrite(Y_ACCESS_V, HIGH);   // 5 V
63
64  pinMode(Y_ACCESS_G, OUTPUT);
65  digitalWrite(Y_ACCESS_G, LOW);    // 0 V / ground
66
67  //delay(500);
68
69  int Y_Voltage = analogRead(TOP_LAYER_INPUT); 
70
71  pinMode(Y_ACCESS_V, INPUT);
72  digitalWrite(Y_ACCESS_V, LOW);
73
74  pinMode(Y_ACCESS_G, INPUT);
75  digitalWrite(Y_ACCESS_G, LOW);
76
77
78
79  //Serial.print("Y voltage: ");
80  //Serial.println(Y_Voltage);
81
82  if (X_Voltage > 450 && Y_Voltage > 450) {
83    digitalWrite(LED_PIN_RED, HIGH);
84    digitalWrite(LED_PIN_BLUE, LOW);
85    digitalWrite(LED_PIN_YELLOW, LOW);
86    digitalWrite(LED_PIN_GREEN, LOW);
87    delay(500);
88    digitalWrite(LED_PIN_RED, LOW);
89    Serial.print("H");
90
91  }
92  else if (X_Voltage > 450 && Y_Voltage < 450) {
93    digitalWrite(LED_PIN_RED, LOW);
94    digitalWrite(LED_PIN_BLUE, HIGH);
95    digitalWrite(LED_PIN_YELLOW, LOW);
96    digitalWrite(LED_PIN_GREEN, LOW);
97    delay(500);
98    digitalWrite(LED_PIN_BLUE, LOW);
99    Serial.print("A");
100
101
102  }
103  else if (X_Voltage < 450 && X_Voltage > 3 && Y_Voltage > 450) {
104    digitalWrite(LED_PIN_RED, LOW);
105    digitalWrite(LED_PIN_BLUE, LOW);
106    digitalWrite(LED_PIN_YELLOW, HIGH);
107    digitalWrite(LED_PIN_GREEN, LOW);
108    delay(500);
109    digitalWrite(LED_PIN_YELLOW, LOW);
110    Serial.print("S");
111  }
112  else if (X_Voltage < 450 && X_Voltage > 50  && Y_Voltage < 450 && Y_Voltage > 40) {
113    digitalWrite(LED_PIN_RED, LOW);
114    digitalWrite(LED_PIN_BLUE, LOW);
115    digitalWrite(LED_PIN_YELLOW, LOW);
116    digitalWrite(LED_PIN_GREEN, HIGH);
117    delay(500);
118    digitalWrite(LED_PIN_GREEN, LOW);
119    Serial.print("D");
120  }
121
122
123}