Social Distancing with Automatic Door Control System

1// --------------------------------------
2// i2c_scanner
3//
4//  Version 1
5//    This program (or code that looks like it)
6//    can be found  in many places.
7//    For example on the Arduino.cc forum.
8//    The original  author is not know.
9// Version 2, Juni 2012, Using Arduino 1.0.1
10//     Adapted  to be as simple as possible by Arduino.cc user Krodal
11// Version 3, Feb 26  2013
12//    V3 by louarnold
13// Version 4, March 3, 2013, Using Arduino 1.0.3
14//    by  Arduino.cc user Krodal.
15//    Changes by louarnold removed.
16//    Scanning  addresses changed from 0...127 to 1...119,
17//    according to the i2c scanner  by Nick Gammon
18//    https://www.gammon.com.au/forum/?id=10896
19// Version  5, March 28, 2013
20//    As version 4, but address scans now to 127.
21//    A  sensor seems to use address 120.
22// Version 6, November 27, 2015.
23//    Added  waiting for the Leonardo serial communication.
24//
25//
26// This sketch tests  the standard 7-bit addresses
27// Devices with higher bit address might not be  seen properly.
28//
29 
30#include <Wire.h>
31 
32 
33void setup()
34{
35  Wire.begin();
36 
37  Serial.begin(9600);
38  while (!Serial);             //  Leonardo: wait for serial monitor
39  Serial.println("\
40I2C Scanner");
41}
42  
43 
44void loop()
45{
46  byte error, address;
47  int nDevices;
48 
49  Serial.println("Scanning...");
50 
51  nDevices = 0;
52  for(address = 1;  address < 127; address++ )
53  {
54    // The i2c_scanner uses the return value  of
55    // the Write.endTransmisstion to see if
56    // a device did acknowledge  to the address.
57    Wire.beginTransmission(address);
58    error = Wire.endTransmission();
59  
60    if (error == 0)
61    {
62      Serial.print("I2C device found at address  0x");
63      if (address<16)
64        Serial.print("0");
65      Serial.print(address,HEX);
66      Serial.println("  !");
67 
68      nDevices++;
69    }
70    else if  (error==4)
71    {
72      Serial.print("Unknown error at address 0x");
73      if (address<16)
74        Serial.print("0");
75      Serial.println(address,HEX);
76    }    
77  }
78  if (nDevices == 0)
79    Serial.println("No I2C devices  found\
80");
81  else
82    Serial.println("done\
83");
84 
85  delay(5000);           // wait 5 seconds for next scan
86}

1// TESTING LDR values
2// ARDUINO PROJECTS BY R
3// AUTHOR: RUCKSIKAA  RAAJKUMAR
4int sensorPin = A0; // The LDR will be connected to A0
5void setup()  {
6   Serial.begin(9600); // Set baud rate to 9600 
7   pinMode(25, OUTPUT);  // Configure laser diode pin as OUTPUT and connect it to D25 (You won't be needing  to add this line of code if you provide 5V to the laser diode separately)
8   delay(1000);
9   digitalWrite(25, HIGH); // Turn on the laser diode
10}
11void loop (){
12     Serial.print(analogRead(sensorPin)); // The LDR reading will be printed on  the Serial monitor
13     Serial.print('\n');
14     delay(1000); // Set a delay  period of 1 second
15} 

1// --------------------------------------
2// i2c_scanner
3//
4//   Version 1
5//    This program (or code that looks like it)
6//    can be found   in many places.
7//    For example on the Arduino.cc forum.
8//    The original   author is not know.
9// Version 2, Juni 2012, Using Arduino 1.0.1
10//     Adapted   to be as simple as possible by Arduino.cc user Krodal
11// Version 3, Feb 26  2013
12//     V3 by louarnold
13// Version 4, March 3, 2013, Using Arduino 1.0.3
14//    by   Arduino.cc user Krodal.
15//    Changes by louarnold removed.
16//    Scanning   addresses changed from 0...127 to 1...119,
17//    according to the i2c scanner   by Nick Gammon
18//    https://www.gammon.com.au/forum/?id=10896
19// Version   5, March 28, 2013
20//    As version 4, but address scans now to 127.
21//    A   sensor seems to use address 120.
22// Version 6, November 27, 2015.
23//    Added   waiting for the Leonardo serial communication.
24//
25//
26// This sketch tests   the standard 7-bit addresses
27// Devices with higher bit address might not be   seen properly.
28//
29 
30#include <Wire.h>
31 
32 
33void setup()
34{
35   Wire.begin();
36 
37  Serial.begin(9600);
38  while (!Serial);             //   Leonardo: wait for serial monitor
39  Serial.println("\
40I2C Scanner");
41}
42   
43 
44void loop()
45{
46  byte error, address;
47  int nDevices;
48 
49   Serial.println("Scanning...");
50 
51  nDevices = 0;
52  for(address = 1;   address < 127; address++ )
53  {
54    // The i2c_scanner uses the return value   of
55    // the Write.endTransmisstion to see if
56    // a device did acknowledge   to the address.
57    Wire.beginTransmission(address);
58    error = Wire.endTransmission();
59   
60    if (error == 0)
61    {
62      Serial.print("I2C device found at address   0x");
63      if (address<16)
64        Serial.print("0");
65      Serial.print(address,HEX);
66       Serial.println("  !");
67 
68      nDevices++;
69    }
70    else if   (error==4)
71    {
72      Serial.print("Unknown error at address 0x");
73       if (address<16)
74        Serial.print("0");
75      Serial.println(address,HEX);
76     }    
77  }
78  if (nDevices == 0)
79    Serial.println("No I2C devices   found\
80");
81  else
82    Serial.println("done\
83");
84 
85  delay(5000);            // wait 5 seconds for next scan
86}