LCR Meter

1// OZOX Elc. 2020 https://youtu.be/eMAkOg5kXIs
2//LCD config
3#include   <Wire.h>
4#include <LiquidCrystal.h>
5
6LiquidCrystal lcd(12, 11, 5, 4, 3,   2);
7
8const int inp = 10, outp = 13;
9const int lcd_L = 6, lcd_Back = 7,   flag_inp = 8;
10
11int deger = 0;
12int btn_dly = 0;
13int btn_sta = 0;
14int   btn_Flag = 0; //Buton durum kaydedicisi.
15int btn_Light = 0;
16double pulse, frequency, capacitance, inductance;
17
18bool islem = false;
19
20void setup()   {
21
22  lcd.begin(16, 2);
23  Serial.begin(115200);
24
25  pinMode(lcd_Back,   OUTPUT);
26  pinMode(flag_inp, INPUT_PULLUP);
27  pinMode(lcd_L, INPUT);
28  pinMode(inp,   INPUT);
29  pinMode(outp, OUTPUT);
30
31  Serial.println("Why hello!");
32   lcd.clear();
33  lcd.setCursor(0, 0);
34  lcd.print("OZOX Elc. 2020");
35   lcd.setCursor(0, 1);
36  lcd.print("Mode:Inductance");
37  delay(2000);
38}
39
40void   loop() {
41  btn_sta = digitalRead(flag_inp);
42  while (btn_sta == 0)
43  {
44     delay(100);
45    btn_dly++;
46    btn_sta = digitalRead(flag_inp);
47    islem   = true;
48  }
49
50  if (islem == true)
51  {
52    if (btn_dly > 0 && btn_dly   <= 10)
53    {
54      btn_Flag = 0;
55      btn_dly = 0;
56    }
57    else   if (btn_dly > 10 && btn_dly <= 20)
58    {
59      btn_Flag = 1;
60      btn_dly   = 0;
61    }
62    else if (btn_dly > 20 && btn_dly <= 30)
63    {
64      btn_Flag   = 2;
65      btn_dly = 0;
66    }
67    else
68    {
69      btn_dly = 0;
70       islem = false;
71    }
72  }
73  if (btn_Flag == 0)
74  {
75    induc();
76   }
77  else if (btn_Flag == 1)
78  {
79    capasit();
80  }
81  else if (btn_Flag   == 2)
82  {
83    lcd.clear();
84    lcd.setCursor(0, 0);
85    lcd.print("-Osman   SEN-");
86    lcd.setCursor(0, 1);
87    lcd.print("Tel:05338250164");
88     delay(100);
89  }
90
91  if (digitalRead(lcd_L) == HIGH)
92  {
93    digitalWrite(lcd_Back,   HIGH);
94  }
95  else
96  {
97    digitalWrite(lcd_Back, LOW);
98  }
99}
100
101void   induc() {
102  digitalWrite(outp, HIGH);
103  delay(5);//give some time to charge   inductor.
104  digitalWrite(outp, LOW);
105  delayMicroseconds(100); //make sure   resination is measured
106  pulse = pulseIn(inp, HIGH, 5000); //returns 0 if timeout
107   if (pulse > 0.1) { //if a timeout did not occur and it took a reading:
108
109     capacitance = 1.E-6; // - insert value here
110
111    frequency = 1.E6 / (2   * pulse);
112    inductance = 1. / (capacitance * frequency * frequency * 4.*3.14159 * 3.14159); //one of my profs told me just do squares like this
113    inductance   *= 1E6; //note that this is the same as saying inductance = inductance*1E6
114     //Serial print
115    Serial.print("High for uS:");
116    Serial.print( pulse   );
117    Serial.print("\	frequency Hz:");
118    Serial.print( frequency );
119     Serial.print("\	inductance uH:");
120    Serial.println( inductance );
121     delay(20);
122    //LCD print
123    lcd.clear();
124    lcd.setCursor(0, 0);
125     lcd.print("Mode:Inductance");
126
127    lcd.setCursor(0, 1);
128    lcd.print("Ind  :");
129    if (inductance <= 999) {
130      lcd.print(inductance);
131      lcd.setCursor(9, 1);
132      lcd.print("uH");
133    }
134    else {
135      lcd.print(1.E-3   * inductance);
136      lcd.setCursor(9, 1);
137
138      lcd.print("mH");
139     }
140    delay(20);
141  }
142}
143
144void capasit() {
145  digitalWrite(outp,   HIGH);
146  delay(5);//give some time to charge inductor.
147  digitalWrite(outp,   LOW);
148  delayMicroseconds(100); //make sure resination is measured
149  pulse   = pulseIn(inp, HIGH, 5000); //returns 0 if timeout
150  if (pulse > 0.1) { //if   a timeout did not occur and it took a reading:
151
152    inductance = 110.34; //   - insert value here
153
154    frequency = 1.E6 / (2 * pulse);
155    capacitance   = 1. / (inductance * frequency * frequency * 4.*3.14159 * 3.14159); //one of my   profs told me just do squares like this
156    capacitance  *= 1E15; //note that   this is the same as saying inductance = inductance*1E6
157    //Serial print
158     Serial.print("High for uS:");
159    Serial.print( pulse );
160    Serial.print("\	frequency   Hz:");
161    Serial.print( frequency );
162    Serial.print("\	Capacitance nF:");
163     Serial.println( capacitance );
164    delay(20);
165    //LCD print
166    lcd.clear();
167     lcd.setCursor(0, 0);
168    lcd.print("Mode:Capacitance");
169    lcd.setCursor(0,   1);
170    lcd.print("Cap :");
171    if (capacitance <= 980) {
172      lcd.print(capacitance);
173       lcd.setCursor(9, 1);
174      lcd.print("nF");
175    }
176    else {
177       lcd.print(capacitance * 1.E-3);
178      lcd.setCursor(9, 1);
179
180      lcd.print("uF");
181     }
182    delay(20);
183  }
184}