Frequency Counter for PC

1/*
2 * Counter
3 * Created: 12/08/2017 23:34:47
4 *  Author: moty22.co.uk
5*/
6
7
8  byte inByte=0, overF=0;
9  unsigned int freq=0;
10
11// the setup function  runs once when you press reset or power the board
12void setup() {
13        //  initialize serial communication at 9600 bits per second:
14    Serial.begin(9600);
15    
16          //1 Hz timer
17    OCR0A = 249;
18    TCCR0A = _BV(WGM00) |  _BV(WGM01) | _BV(COM0A0); //   
19    TCCR0B = _BV(WGM02) | _BV(CS02) | _BV(CS01);  //  PWM mode, input T0 pin D4
20    pinMode(6, OUTPUT);
21    
22      //250  Hz - timer2
23    OCR2A =249;
24    OCR2B = 125;  
25    TCCR2A = _BV(COM2B1)  | _BV(COM2B0) | _BV(WGM21) | _BV(WGM20);  //output B in phase, fast PWM mode
26    TCCR2B = _BV(WGM22) | _BV(CS22) | _BV(CS21); // set prescaler to 256 and start  the timer
27    pinMode(3, OUTPUT);
28    
29        //  counter input T1 pin  D5
30    OCR1A = 32767;   //32768 counts
31    TCCR1A = _BV(WGM10) | _BV(WGM11)  | _BV(COM1A0); //   
32    TCCR1B =_BV(WGM12) | _BV(WGM13) | _BV(CS12) | _BV(CS11);  //input pin D5
33    pinMode(9, OUTPUT);
34    
35        //wait for connection  from PC
36    while(Serial.available() == 0) {}
37    if(Serial.read() == 255){Serial.write(255);}     // if incoming byte=255 send 255.
38      
39}
40
41  
42  // the loop  function runs over and over again forever
43void loop() {
44
45   if (Serial.available()  > 0) {
46          // read the incoming byte:
47      inByte = Serial.read();
48      if(inByte == 255){Serial.write(255);}
49 
50   }
51      //counter 
52
53    while(digitalRead(6)){}
54    while(!digitalRead(6)){}
55 
56    TIFR1 =  _BV(OCF1A);    //reset int
57    OCR1A = 32767; 
58    TCNT1=0;
59    overF=0;
60    while(digitalRead(6)){
61    if(TIFR1 & (1<<OCF1A)) {++overF; TIFR1 = _BV(OCF1A);}   //overflow 
62    }
63    freq = TCNT1 ; 
64    
65    Serial.write(highByte(analogRead(A1)));  //send low byte of 10 bits analogue read
66    Serial.write(lowByte(analogRead(A1)));  //send high byte of 10 bits analogue read
67    
68    Serial.write(0);
69    Serial.write(overF);
70    Serial.write(highByte(freq));
71    Serial.write(lowByte(freq));
72 
73}
74
75
76

1/*
2 * Counter
3 * Created: 12/08/2017 23:34:47
4 *  Author: moty22.co.uk
5*/
6
7
8
9  byte inByte=0, overF=0;
10  unsigned int freq=0;
11
12// the setup function
13  runs once when you press reset or power the board
14void setup() {
15        //
16  initialize serial communication at 9600 bits per second:
17    Serial.begin(9600);
18
19    
20          //1 Hz timer
21    OCR0A = 249;
22    TCCR0A = _BV(WGM00) |
23  _BV(WGM01) | _BV(COM0A0); //   
24    TCCR0B = _BV(WGM02) | _BV(CS02) | _BV(CS01);
25  //  PWM mode, input T0 pin D4
26    pinMode(6, OUTPUT);
27    
28      //250
29  Hz - timer2
30    OCR2A =249;
31    OCR2B = 125;  
32    TCCR2A = _BV(COM2B1)
33  | _BV(COM2B0) | _BV(WGM21) | _BV(WGM20);  //output B in phase, fast PWM mode
34
35    TCCR2B = _BV(WGM22) | _BV(CS22) | _BV(CS21); // set prescaler to 256 and start
36  the timer
37    pinMode(3, OUTPUT);
38    
39        //  counter input T1 pin
40  D5
41    OCR1A = 32767;   //32768 counts
42    TCCR1A = _BV(WGM10) | _BV(WGM11)
43  | _BV(COM1A0); //   
44    TCCR1B =_BV(WGM12) | _BV(WGM13) | _BV(CS12) | _BV(CS11);
45  //input pin D5
46    pinMode(9, OUTPUT);
47    
48        //wait for connection
49  from PC
50    while(Serial.available() == 0) {}
51    if(Serial.read() == 255){Serial.write(255);}
52     // if incoming byte=255 send 255.
53      
54}
55
56  
57  // the loop
58  function runs over and over again forever
59void loop() {
60
61   if (Serial.available()
62  > 0) {
63          // read the incoming byte:
64      inByte = Serial.read();
65
66      if(inByte == 255){Serial.write(255);}
67 
68   }
69      //counter 
70
71
72    while(digitalRead(6)){}
73    while(!digitalRead(6)){}
74 
75    TIFR1 =
76  _BV(OCF1A);    //reset int
77    OCR1A = 32767; 
78    TCNT1=0;
79    overF=0;
80
81    while(digitalRead(6)){
82    if(TIFR1 & (1<<OCF1A)) {++overF; TIFR1 = _BV(OCF1A);}
83   //overflow 
84    }
85    freq = TCNT1 ; 
86    
87    Serial.write(highByte(analogRead(A1)));
88  //send low byte of 10 bits analogue read
89    Serial.write(lowByte(analogRead(A1)));
90  //send high byte of 10 bits analogue read
91    
92    Serial.write(0);
93    Serial.write(overF);
94
95    Serial.write(highByte(freq));
96    Serial.write(lowByte(freq));
97 
98}
99
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101