Arduino Voltmeter

1#include <LiquidCrystal.h>
2
3/*
4  LiquidCrystal Library - Hello  World
5
6 Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
7 library  works with all LCD displays that are compatible with the
8 Hitachi HD44780 driver.  There are many of them out there, and you
9 can usually tell them by the 16-pin  interface.
10
11 This sketch prints "Hello World!" to the LCD
12 and shows  the time.
13
14  The circuit:
15 * LCD RS pin to digital pin 12
16 * LCD Enable  pin to digital pin 11
17 * LCD D4 pin to digital pin 5
18 * LCD D5 pin to digital  pin 4
19 * LCD D6 pin to digital pin 3
20 * LCD D7 pin to digital pin 2
21 *  LCD R/W pin to ground
22 * LCD VSS pin to ground
23 * LCD VCC pin to 5V
24 *  10K resistor:
25 * ends to +5V and ground
26 * wiper to LCD VO pin (pin 3)
27
28  Library originally added 18 Apr 2008
29 by David A. Mellis
30 library modified  5 Jul 2009
31 by Limor Fried (http://www.ladyada.net)
32 example added 9 Jul 2009
33  by Tom Igoe
34 modified 22 Nov 2010
35 by Tom Igoe
36 modified 7 Nov 2016
37  by Arturo Guadalupi
38
39 This example code is in the public domain.
40
41 http://www.arduino.cc/en/Tutorial/LiquidCrystalHelloWorld
42  
43 Modified by : BMIAK Basnayaka for SETNFIX
44 Date : 22/04/2021
45 http://setnfix.com
46
47*/
48
49//  include the library code:
50#include <LiquidCrystal.h>
51
52// initialize the  library by associating any needed LCD interface pin
53// with the arduino pin number  it is connected to
54const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
55LiquidCrystal  lcd(rs, en, d4, d5, d6, d7);
56int analogInput = 0;
57float vout = 0.0;
58float  vin = 0.0;
59float R1 = 100000.0; // resistance of R1 (100K) -see text!
60float  R2 = 10000.0; // resistance of R2 (10K) - see text!
61int value = 0;
62
63void  setup() {
64  // set up the LCD's number of columns and rows:
65  lcd.begin(16,  2);
66  // Print a message to the LCD.
67  
68  lcd.print("SetNFix");
69     pinMode(analogInput,  INPUT);
70Serial.begin(9600);
71  delay(5000);
72}
73
74void loop() {
75  
76     // read the value at analog input
77   value = analogRead(analogInput);
78   vout = (value * 5.0) / 1024.0; // see text
79   vin = vout / (R2/(R1+R2)); 
80   if (vin<0.09) {
81   vin=0.0;//statement to quash undesired reading !
82} 
83  // set the cursor to column 0, line 1
84  // (note: line 1 is the second row,  since counting begins with 0):
85  lcd.setCursor(0, 0);
86  lcd.print("Volt Meter");
87  lcd.setCursor(0, 1);
88  // print the number of seconds since reset:
89  unsigned  int len = sizeof(vin);
90  len = len +2;
91  
92  lcd.print(vin);
93  lcd.print("  ");
94  //lcd.setCursor(len, 1);
95   lcd.print("Volts");
96  lcd.print("  ");
97}
98

1#include <LiquidCrystal.h>
2
3/*
4  LiquidCrystal Library - Hello   World
5
6 Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
7 library   works with all LCD displays that are compatible with the
8 Hitachi HD44780 driver.   There are many of them out there, and you
9 can usually tell them by the 16-pin   interface.
10
11 This sketch prints "Hello World!" to the LCD
12 and shows   the time.
13
14  The circuit:
15 * LCD RS pin to digital pin 12
16 * LCD Enable   pin to digital pin 11
17 * LCD D4 pin to digital pin 5
18 * LCD D5 pin to digital   pin 4
19 * LCD D6 pin to digital pin 3
20 * LCD D7 pin to digital pin 2
21 *   LCD R/W pin to ground
22 * LCD VSS pin to ground
23 * LCD VCC pin to 5V
24 *   10K resistor:
25 * ends to +5V and ground
26 * wiper to LCD VO pin (pin 3)
27
28   Library originally added 18 Apr 2008
29 by David A. Mellis
30 library modified   5 Jul 2009
31 by Limor Fried (http://www.ladyada.net)
32 example added 9 Jul 2009
33   by Tom Igoe
34 modified 22 Nov 2010
35 by Tom Igoe
36 modified 7 Nov 2016
37   by Arturo Guadalupi
38
39 This example code is in the public domain.
40
41 http://www.arduino.cc/en/Tutorial/LiquidCrystalHelloWorld
42   
43 Modified by : BMIAK Basnayaka for SETNFIX
44 Date : 22/04/2021
45 http://setnfix.com
46
47*/
48
49//   include the library code:
50#include <LiquidCrystal.h>
51
52// initialize the   library by associating any needed LCD interface pin
53// with the arduino pin number   it is connected to
54const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
55LiquidCrystal   lcd(rs, en, d4, d5, d6, d7);
56int analogInput = 0;
57float vout = 0.0;
58float   vin = 0.0;
59float R1 = 100000.0; // resistance of R1 (100K) -see text!
60float   R2 = 10000.0; // resistance of R2 (10K) - see text!
61int value = 0;
62
63void   setup() {
64  // set up the LCD's number of columns and rows:
65  lcd.begin(16,   2);
66  // Print a message to the LCD.
67  
68  lcd.print("SetNFix");
69     pinMode(analogInput,   INPUT);
70Serial.begin(9600);
71  delay(5000);
72}
73
74void loop() {
75  
76      // read the value at analog input
77   value = analogRead(analogInput);
78    vout = (value * 5.0) / 1024.0; // see text
79   vin = vout / (R2/(R1+R2)); 
80    if (vin<0.09) {
81   vin=0.0;//statement to quash undesired reading !
82} 
83   // set the cursor to column 0, line 1
84  // (note: line 1 is the second row,   since counting begins with 0):
85  lcd.setCursor(0, 0);
86  lcd.print("Volt Meter");
87   lcd.setCursor(0, 1);
88  // print the number of seconds since reset:
89  unsigned   int len = sizeof(vin);
90  len = len +2;
91  
92  lcd.print(vin);
93  lcd.print("   ");
94  //lcd.setCursor(len, 1);
95   lcd.print("Volts");
96  lcd.print("   ");
97}
98