1. //#define CAYENNE_DEBUG
2. #define CAYENNE_PRINT Serial  // Comment this out to disable prints and save space
3. #include <CayenneMQTTEthernet.h>
4.  
5. // Cayenne authentication info. This should be obtained from the Cayenne Dashboard.
6. char username[] = "";
7. char password[] = "";
8. char clientID[] = "";
9.  
10. #define PRESISTOR_VIRTUAL_CHANNEL 0
11.  
12. #define DISTANCE_VIRTUAL_CHANNEL 1
13.  
14. // Defines pins numbers for the HC-SR04 connections.
15. const int trigPin = 9;
16. const int echoPin = 10;
17. const int pResistor = A0;
18.  
19. long duration;
20. int distanceCm;
21. int value;
22. void setup() {
23.  
24. pinMode(trigPin, OUTPUT);
25. pinMode(echoPin, INPUT);
26. Serial.begin(9600);
27. pinMode(pResistor, INPUT);// Set pResistor - A0 pin as an input (optional)
28.  
29.  Cayenne.begin(username, password, clientID);
30.  
31. }
32.  
33. void loop() {
34.  // Cayenne.loop();
35. value = analogRead(pResistor);
36.     Serial.println(value);
37.  
38.  
39. digitalWrite(trigPin, LOW);
40. delayMicroseconds(2);
41. digitalWrite(trigPin, HIGH);
42. delayMicroseconds(10);
43. digitalWrite(trigPin, LOW);
44. duration = pulseIn(echoPin, HIGH);
45. distanceCm= duration*0.034/2;
46.  
47.       Serial.println(distanceCm);// if distance less than 0.5 meter and more than 0 (0 or less means over range)
48.  
49. delay(100);
50.  
51.  
52. if( (distanceCm < 68)&&(distanceCm > 10) && (value < 180))
53.  {
54.   Cayenne.virtualWrite(DISTANCE_VIRTUAL_CHANNEL, distanceCm, "prox", "cm");
55.   Cayenne.virtualWrite(PRESISTOR_VIRTUAL_CHANNEL,value);
56. }
57.  
58. }
59.  
60.  
61. CAYENNE_OUT(PRESISTOR_VIRTUAL_CHANNEL)
62. {
63.    
64.    value = analogRead(pResistor);
65.    Serial.println(value);
66.    
67.  
68. Cayenne.virtualWrite(PRESISTOR_VIRTUAL_CHANNEL,value);
69. }
70.  
71. // This function is called at intervals to send HC-SR04 sensor data to Cayenne.
72. CAYENNE_OUT(DISTANCE_VIRTUAL_CHANNEL)
73. {
74.  digitalWrite(trigPin, LOW);
75. delayMicroseconds(2);
76. digitalWrite(trigPin, HIGH);
77. delayMicroseconds(10);
78. digitalWrite(trigPin, LOW);
79. duration = pulseIn(echoPin, HIGH);
80. distanceCm= duration*0.034/2;
81.  
82. Serial.println(distanceCm);// if distance less than 0.5 meter and more than 0 (0 or less means over range)
83.  
84. delay(100);
85.   // Send the distance value to Cayenne on proximity widget in centimeter.
86.   Cayenne.virtualWrite(DISTANCE_VIRTUAL_CHANNEL, distanceCm, "prox", "cm");
87. }