IoT diagnostic vehicle for model railways could be realized thanks to Arduino® Nano32 in scale 1/87 (gauge H0)

1// Code for the diagnostic coach for model trains and catenary
2// runs on gauge H0 (scale 1/87)
3// Arduino Nano ESP 32 and Arduino Cloud
4
5#include "arduino_secrets.h"
6#include <WiFiManager.h>
7#include <strings_en.h>
8#include <wm_consts_en.h>
9#include <wm_strings_en.h>
10#include <wm_strings_es.h>
11#include <movingAvg.h>
12/* 
13  Sketch generated by the Arduino IoT Cloud Thing "Untitled"
14  https://create.arduino.cc/cloud/things/........
15  Arduino IoT Cloud Variables description
16  The following variables are automatically generated and updated when changes are made to the Thing
17
18  float rawVoltage;
19  float VsAC;
20  bool green;
21  bool red;
22
23  Variables which are marked as READ/WRITE in the Cloud Thing will also have functions
24  which are called when their values are changed from the Dashboard.
25  These functions are generated with the Thing and added at the end of this sketch.
26*/
27
28#include "thingProperties.h"
29
30const int sensorPin = A3;
31const float baseLineVs = 16.8;  // threshold VsAC  Voltage
32const int RunningAverageCount = 57;
33float RunningAverageBuffer[RunningAverageCount];
34
35int NextRunningAverage;
36int buzzer = 8;  // setting controls the digital IO foot buzzer
37void setup() {
38
39
40  // Initialize serial and wait for port to open:
41  Serial.begin(9600);
42  // This delay gives the chance to wait for a Serial Monitor without blocking if none is found
43  delay(1500); 
44
45   // set the LED pins as outputs
46  // the for() loop saves some extra coding
47  for (int pinNumber = 2; pinNumber < 5; pinNumber++) {
48    pinMode(pinNumber, OUTPUT);
49    digitalWrite(pinNumber, LOW);
50  }
51
52  // Defined in thingProperties.h
53  initProperties();
54
55  // Connect to Arduino IoT Cloud
56  ArduinoCloud.begin(ArduinoIoTPreferredConnection);
57  
58  /*
59     The following function allows you to obtain more information
60     related to the state of network and IoT Cloud connection and errors
61     the higher number the more granular information you’ll get.
62     The default is 0 (only errors).
63     Maximum is 4
64 */
65  setDebugMessageLevel(2);
66  ArduinoCloud.printDebugInfo();
67}
68
69void loop() {
70  ArduinoCloud.update();
71  
72  // Your code here 
73  pinMode(buzzer, OUTPUT);  // set the digital IO pin mode, OUTPUT out of Wen }
74  rawVoltage = analogRead(sensorPin);
75
76  RunningAverageBuffer[NextRunningAverage++] = rawVoltage;
77  if (NextRunningAverage >= RunningAverageCount) {
78    NextRunningAverage = 0;
79  }
80  float RunningAverageVoltage = 0;
81  for (int i = 0; i < RunningAverageCount; ++i) {
82    RunningAverageVoltage += RunningAverageBuffer[i];
83  }
84  RunningAverageVoltage /= RunningAverageCount;
85  // convert the DC voltage to AC voltage for display
86  // the diode bridge sensor changes from V0= 0 -3.3 V DC, if the AC Voltage changes from Vs= 0 -24 V
87  // the diode bridge says there's a 1.4 V offset
88  // ((voltage + 1.4 V) times 4.8;  V0 = Vs * R2/(R1+R2)); voltage divider with resitors
89  VsAC = (RunningAverageVoltage - 60) / 4096.0 * 28.2;
90  Serial.println(", average Voltage VsAC : ");
91  // Serial.println();
92  Serial.print("\t");
93  Serial.print(VsAC);
94  Serial.print("\t");
95  Serial.print(19);
96  Serial.print("\t");
97  Serial.println(16.8);
98
99  // if the voltage Vs is lower than the baseline turn on red LED
100  int pitch = map(VsAC, 0.0, 23.9, 50, 4000);
101  if (VsAC < baseLineVs) {
102    digitalWrite(2, LOW);  // GREEN
103    green = false;
104    digitalWrite(3, LOW);  // YELLOW
105    digitalWrite(4, HIGH); // RED
106    red = true;
107    tone(8, pitch, 20);
108    delay(25);
109  }  // if the voltage rises between  18.1 - 18.6, turn green LED on
110  else if (VsAC >= baseLineVs && VsAC < baseLineVs + 2.6) {
111    digitalWrite(2, HIGH);  // GREEN
112    green = true;
113    digitalWrite(3, LOW);  // YELLOW
114    digitalWrite(4, LOW);  // RED
115    red = false;
116  }  // if the voltage rises between 18 Vac and 20 Vac, turn a second LED on yellow
117  else if (VsAC >= baseLineVs + 2.6 && VsAC < baseLineVs + 3.8) {
118    digitalWrite(2, HIGH);  // GREEN
119    green = true;
120    digitalWrite(3, HIGH);  // YELLOW
121    digitalWrite(4, LOW);   // RED
122    red = false;
123  }                         // if the voltage rises over, turn yellow and red LEDs on
124  else if (VsAC >= baseLineVs + 3.8) {
125    digitalWrite(2, LOW);   // GREEN
126    green = false;
127    digitalWrite(3, HIGH);  // YELLOW
128    digitalWrite(4, HIGH);  // RED
129    red = true;
130  }
131}