Doorbell

1/*
2 * eeprom_bell.ino
3 *
4 * Created: 30/06/2017 23:34:47
5  *  Author: moty22.co.uk
6 */ 
7#include <Wire.h>
8
9
10const int audio  = 6;     //output D6
11const int ring = A2;     //ring pushbutton
12int ringPB=1;         // ring pushbutton status
13
14void setup() {
15  // put your setup  code here, to run once:
16
17pinMode(ring, INPUT_PULLUP);
18
19  //PWM Timer0
20OCR0A  = 64;
21TCCR0A = _BV(COM0A1) | _BV(WGM01) | _BV(WGM00);  //output in phase, fast  PWM mode
22TCCR0B = _BV(CS00); // 16MHz/256 = 64KHz
23
24Wire.begin();        //  init i2c bus
25Wire.setClock(200000);  //200khz
26
27}
28
29
30
31void loop()
32{
33    unsigned int i;
34    
35    ringPB=digitalRead(ring);
36    if(ringPB==LOW)   //pushbutton
37     {
38      pinMode(audio, OUTPUT);
39          //go to  address 0
40      Wire.beginTransmission(0x50);
41      Wire.write((int)(0));   //MSB of eeprom address
42      Wire.write((int)(0)); // LSB
43      Wire.endTransmission();
44
45
46       //start sequential read
47      TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);  //start command
48      while (!(TWCR & (1<<TWINT)));   //till interrupt 
49        //write  address
50      TWDR = 0b10100001;    //address+read
51      TWCR = (1<<TWINT)|(1<<TWEN);
52      while (!(TWCR & (1<<TWINT)));   //till interrupt 
53    
54          //read  all the bytes
55      for (i=0; i<0xfff0; i++)
56      {
57         //send ACK
58        TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWEA);
59        while (!(TWCR & (1<<TWINT)));
60        OCR0A =  TWDR;      //PWM = eeprom data
61      }  
62    
63        //send  NACK, no-aknowledgement + stop commands ends reading
64      TWCR = (1<<TWINT)|(1<<TWEN);
65      while (!(TWCR & (1<<TWINT)));
66      OCR0A =  TWDR;  
67      
68        //stop
69      TWCR = (1<<TWINT)|(1<<TWSTO)|(1<<TWEN);  
70
71      pinMode(audio, INPUT);    //stop the audio output 
72     }
73     
74}
75
76
77
78

1/*
2 * eeprom_bell.ino
3 *
4 * Created: 30/06/2017 23:34:47
5
6  *  Author: moty22.co.uk
7 */ 
8#include <Wire.h>
9
10
11const int audio
12  = 6;     //output D6
13const int ring = A2;     //ring pushbutton
14int ringPB=1;
15         // ring pushbutton status
16
17void setup() {
18  // put your setup
19  code here, to run once:
20
21pinMode(ring, INPUT_PULLUP);
22
23  //PWM Timer0
24OCR0A
25  = 64;
26TCCR0A = _BV(COM0A1) | _BV(WGM01) | _BV(WGM00);  //output in phase, fast
27  PWM mode
28TCCR0B = _BV(CS00); // 16MHz/256 = 64KHz
29
30Wire.begin();        //
31  init i2c bus
32Wire.setClock(200000);  //200khz
33
34}
35
36
37
38void loop()
39{
40
41    unsigned int i;
42    
43    ringPB=digitalRead(ring);
44    if(ringPB==LOW)
45   //pushbutton
46     {
47      pinMode(audio, OUTPUT);
48          //go to
49  address 0
50      Wire.beginTransmission(0x50);
51      Wire.write((int)(0));
52   //MSB of eeprom address
53      Wire.write((int)(0)); // LSB
54      Wire.endTransmission();
55
56
57
58       //start sequential read
59      TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);
60  //start command
61      while (!(TWCR & (1<<TWINT)));   //till interrupt 
62        //write
63  address
64      TWDR = 0b10100001;    //address+read
65      TWCR = (1<<TWINT)|(1<<TWEN);
66
67      while (!(TWCR & (1<<TWINT)));   //till interrupt 
68    
69          //read
70  all the bytes
71      for (i=0; i<0xfff0; i++)
72      {
73         //send ACK
74
75        TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWEA);
76        while (!(TWCR & (1<<TWINT)));
77
78        OCR0A =  TWDR;      //PWM = eeprom data
79      }  
80    
81        //send
82  NACK, no-aknowledgement + stop commands ends reading
83      TWCR = (1<<TWINT)|(1<<TWEN);
84
85      while (!(TWCR & (1<<TWINT)));
86      OCR0A =  TWDR;  
87      
88        //stop
89
90      TWCR = (1<<TWINT)|(1<<TWSTO)|(1<<TWEN);  
91
92      pinMode(audio, INPUT);
93    //stop the audio output 
94     }
95     
96}
97
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100