Simple fitness timer

Beep Beep Beeeep, you can collapse now!

Jun 4, 2020

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5458 views

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3 respects

audio

timer

fitness

Devices & Components

Arduino Uno Rev3

Prototype shield

LCD shield

Piezo sounder

Software & Tools

Arduino IDE

Project description

Code

Fintess timer code

c_cpp

1
2//simple fitness timer 
3//
4
5/*
6 The circuit:
7
8 *  1* sounder pin 3
9
10 * LCD shield:
11 * Backlight - pin 10 removed
12 * B4  to D4
13 * B5 to D5
14 * B6 to D6
15 * B7 to D7 
16 * RS to D8
17 * E to D9
18  * 
19 * LCD shield buttons:
20 * Analog 0
21*/
22
23//CHECK TO SEE IF LCD IS  ONE OF THE FAULTY ONES
24//MINE HAD PROBLEMS SO I DESOLDERED AND REMOVED THE FAULTY  PIN 10
25//REFERENCE - https://forum.arduino.cc/index.php?topic=96747.0 (Retrieved  7/June/2019)
26//for the LCD shield
27//my_aliases
28
29//for the LCD shield
30#include  <LiquidCrystal.h>
31
32// select the pins used on the LCD panel
33LiquidCrystal  lcd(8, 9, 4, 5, 6, 7);
34// http://www.robotshop.com/content/PDF/dfrobot-lcd-keypad-shield-schematic.pdf  
35
36//required to debounce switch
37#define MAX_CHECKS 10
38volatile uint8_t  Debounced_State=0;//accessed by isr and main loop code
39uint8_t State[MAX_CHECKS]={0};
40uint8_t  Index=0;
41
42//for the buzzer  
43const int sounder_pin=3;//  the PWM pin the  buzzer is attached to
44int duty_cycle = 127;         // 0-255 so 50% = 127 approx
45int  hi_frequency=0x02;
46const int low_frequency=0x03;
47
48//seconds for work and  rest periods and set toggle to false
49const long int work_array[]={20,30,60,90};
50const  int work_array_max=3;
51const long int rest_array[]={20,30,60,90};
52const int  rest_array_max=3;
53bool toggle_on=false;
54
55void setup() {
56
57//initial  lcd setup
58  lcd.begin(16,2);   // initialize the lcd for 16 chars 2 lines, turn  on backlight   
59  lcd.clear();
60
61  update_display(work_array[0],rest_array[0],false);
62  delay(5000);
63
64  // initialize digital pin as an output.
65  pinMode(sounder_pin,  OUTPUT);
66
67      // initialize timer1 
68  noInterrupts();           // disable  all interrupts
69  TCCR1A = 0;
70  TCCR1B = 0;
71  TCNT1  = 0;
72
73  OCR1A  = 625;              // compare match register  16MHX/256/100HZ 
74  TCCR1B |= (1  << WGM12);   // CTC mode
75  TCCR1B |= (1 << CS12);    // 256 prescaler 
76  TIMSK1  |= (1 << OCIE1A);  // enable timer compare interrupt
77  interrupts();
78
79
80}/*end  of setup*/
81
82void loop() {
83
84//variables
85bool count_updated=true;
86bool  toggle_pressed=false;
87bool work_updated=false;
88bool rest_updated=false;
89bool  start_work=false;
90bool start_rest=false;
91
92static bool button_up=false;
93static  bool chord_ready=false;
94static int Stored_State=0;
95static int Action_Me=0;
96
97static  bool enter_pressed=false;
98
99static int work_level=0;
100static int rest_level=0;
101
102static  int work_count=0;
103static int rest_count=0;
104
105static bool work_done=false;
106static  bool rest_done=false;
107 
108while(1){
109
110    noInterrupts();           //  disable all interrupts    
111if (Debounced_State>Stored_State){Stored_State=Debounced_State;chord_ready=true;}//store  chord and flag as ready
112if (Debounced_State<Stored_State){if(chord_ready){button_up=true;Action_Me=Stored_State;}Stored_State=Debounced_State;}  
113    interrupts();             // enable all interrupts
114
115if(button_up &&  chord_ready)
116{
117chord_ready=false;
118button_up=false;
119
120if (Action_Me&1<<0){toggle_pressed=true;}//toggle  button                      
121if (Action_Me&1<<2){work_updated=true;}//work button
122if  (Action_Me&1<<3){rest_updated=true;}//rest button
123
124if (Action_Me&1<<1){start_work=true;}//start  work button
125if (Action_Me&1<<4){start_rest=true;}//start rest button
126/**/
127
128}
129  
130  if (toggle_pressed){
131  
132  count_updated=false;
133  toggle_pressed=false;  
134  toggle_on=!toggle_on;
135  update_display(work_array[work_level],rest_array[rest_level],toggle_on);                 
136                    }
137
138if (work_updated){
139  
140  //enter_pressed=false;
141  work_updated=false;
142  work_level++;
143  if (work_level>work_array_max){work_level=0;}
144  update_display(work_array[work_level],rest_array[rest_level],toggle_on);
145                  }
146
147if  (rest_updated){
148  
149  //enter_pressed=false;
150  rest_updated=false;
151  rest_level++;
152  if (rest_level>rest_array_max){rest_level=0;}
153  update_display(work_array[work_level],rest_array[rest_level],toggle_on);
154                  }                  
155
156if (start_work){
157
158  TCCR2B =  TCCR2B & 0b11111000 | hi_frequency;//PWM frequency
159  
160  if(work_count!=work_array[work_level]  && !work_done){
161  analogWrite(sounder_pin, duty_cycle);
162  delay(100);
163  analogWrite(sounder_pin,0);
164  delay(900);
165  work_count++;
166  }else{work_count=0;if(toggle_on){start_rest=true;}else{analogWrite(sounder_pin,  duty_cycle);
167  delay(300);analogWrite(sounder_pin,0);};start_work=false;}
168                  }
169                  
170
171if (start_rest){
172
173  TCCR2B  = TCCR2B & 0b11111000 | low_frequency;//PWM frequency
174  
175  if(rest_count!=rest_array[rest_level]){
176  analogWrite(sounder_pin, duty_cycle);//pin,frequency,duration in milliseconds
177  delay(100);
178  analogWrite(sounder_pin,0);
179  delay(900);
180  rest_count++;
181  }else{rest_count=0;if(toggle_on){start_work=true;}else{analogWrite(sounder_pin,  duty_cycle);//pin,frequency,duration in milliseconds
182  delay(300);analogWrite(sounder_pin,0);};start_rest=false;}
183                  }
184/**/
185                         
186}//end of program
187
188  
189  
190
191
192  
193}/*end of loop*/
194
195//my_functions
196
197ISR(TIMER1_COMPA_vect)          // timer compare interrupt service routine
198{
199
200//read buttons
201  uint8_t temp=0x00;
202/*
203 * //rough values from read of analog buttons
204636  //select  - togggle
205408 //left    - start work
206254 //donwn   - increment work
207101  //up      - increment rest
2080   //right   - start rest
209*/  
210 if (analogRead(0)  > 600  && analogRead(0) < 650){temp|=1<<0;} //btnTOGGLE  
211 if (analogRead(0)  > 380 && analogRead(0) < 450){temp|=1<<1;} //btnSTART_WORK
212 if (analogRead(0)  > 200 && analogRead(0) < 300){temp|=1<<2;} //btnUP_WORK
213 if (analogRead(0) >  50 && analogRead(0) < 150){temp|=1<<3;} //btnUP_REST
214 if (analogRead(0) >= 0  && analogRead(0) < 45){temp|=1<<4;} //btnSTART_REST
215 
216//debounce
217  uint8_t  i,j;
218  State[Index]= temp;
219  ++Index;
220  j=0xFF;
221  for (i=0;i<MAX_CHECKS;i++){j=j&State[i];}
222  Debounced_State=j;
223  if(Index>=MAX_CHECKS){Index=0;} 
224}
225
226
227//my_screen_functions
228void  update_display(long int work_period, long int rest_period, bool toggle_on)
229{
230  lcd.clear();
231  lcd.setCursor(0,0);
232  lcd.print("Work  Rest Togg");
233  lcd.setCursor(1,1);
234  lcd.print(work_period);
235  lcd.setCursor(7,1);
236  lcd.print(rest_period);
237  lcd.setCursor(11,1);
238  if (toggle_on){lcd.print("True");}else{lcd.print("False");}
239  }//end of update screen 
240

//simple fitness timer 
//

/*
 The circuit:

 *  1* sounder pin 3

 * LCD shield:
 * Backlight - pin 10 removed
 * B4  to D4
 * B5 to D5
 * B6 to D6
 * B7 to D7 
 * RS to D8
 * E to D9
  * 
 * LCD shield buttons:
 * Analog 0
*/

//CHECK TO SEE IF LCD IS  ONE OF THE FAULTY ONES
//MINE HAD PROBLEMS SO I DESOLDERED AND REMOVED THE FAULTY  PIN 10
//REFERENCE - https://forum.arduino.cc/index.php?topic=96747.0 (Retrieved  7/June/2019)
//for the LCD shield
//my_aliases

//for the LCD shield
#include  <LiquidCrystal.h>

// select the pins used on the LCD panel
LiquidCrystal  lcd(8, 9, 4, 5, 6, 7);
// http://www.robotshop.com/content/PDF/dfrobot-lcd-keypad-shield-schematic.pdf  

//required to debounce switch
#define MAX_CHECKS 10
volatile uint8_t  Debounced_State=0;//accessed by isr and main loop code
uint8_t State[MAX_CHECKS]={0};
uint8_t  Index=0;

//for the buzzer  
const int sounder_pin=3;//  the PWM pin the  buzzer is attached to
int duty_cycle = 127;         // 0-255 so 50% = 127 approx
int  hi_frequency=0x02;
const int low_frequency=0x03;

//seconds for work and  rest periods and set toggle to false
const long int work_array[]={20,30,60,90};
const  int work_array_max=3;
const long int rest_array[]={20,30,60,90};
const int  rest_array_max=3;
bool toggle_on=false;

void setup() {

//initial  lcd setup
  lcd.begin(16,2);   // initialize the lcd for 16 chars 2 lines, turn  on backlight   
  lcd.clear();

  update_display(work_array[0],rest_array[0],false);
  delay(5000);

  // initialize digital pin as an output.
  pinMode(sounder_pin,  OUTPUT);

      // initialize timer1 
  noInterrupts();           // disable  all interrupts
  TCCR1A = 0;
  TCCR1B = 0;
  TCNT1  = 0;

  OCR1A  = 625;              // compare match register  16MHX/256/100HZ 
  TCCR1B |= (1  << WGM12);   // CTC mode
  TCCR1B |= (1 << CS12);    // 256 prescaler 
  TIMSK1  |= (1 << OCIE1A);  // enable timer compare interrupt
  interrupts();


}/*end  of setup*/

void loop() {

//variables
bool count_updated=true;
bool  toggle_pressed=false;
bool work_updated=false;
bool rest_updated=false;
bool  start_work=false;
bool start_rest=false;

static bool button_up=false;
static  bool chord_ready=false;
static int Stored_State=0;
static int Action_Me=0;

static  bool enter_pressed=false;

static int work_level=0;
static int rest_level=0;

static  int work_count=0;
static int rest_count=0;

static bool work_done=false;
static  bool rest_done=false;
 
while(1){

    noInterrupts();           //  disable all interrupts    
if (Debounced_State>Stored_State){Stored_State=Debounced_State;chord_ready=true;}//store  chord and flag as ready
if (Debounced_State<Stored_State){if(chord_ready){button_up=true;Action_Me=Stored_State;}Stored_State=Debounced_State;}  
    interrupts();             // enable all interrupts

if(button_up &&  chord_ready)
{
chord_ready=false;
button_up=false;

if (Action_Me&1<<0){toggle_pressed=true;}//toggle  button                      
if (Action_Me&1<<2){work_updated=true;}//work button
if  (Action_Me&1<<3){rest_updated=true;}//rest button

if (Action_Me&1<<1){start_work=true;}//start  work button
if (Action_Me&1<<4){start_rest=true;}//start rest button
/**/

}
  
  if (toggle_pressed){
  
  count_updated=false;
  toggle_pressed=false;  
  toggle_on=!toggle_on;
  update_display(work_array[work_level],rest_array[rest_level],toggle_on);                 
                    }

if (work_updated){
  
  //enter_pressed=false;
  work_updated=false;
  work_level++;
  if (work_level>work_array_max){work_level=0;}
  update_display(work_array[work_level],rest_array[rest_level],toggle_on);
                  }

if  (rest_updated){
  
  //enter_pressed=false;
  rest_updated=false;
  rest_level++;
  if (rest_level>rest_array_max){rest_level=0;}
  update_display(work_array[work_level],rest_array[rest_level],toggle_on);
                  }                  

if (start_work){

  TCCR2B =  TCCR2B & 0b11111000 | hi_frequency;//PWM frequency
  
  if(work_count!=work_array[work_level]  && !work_done){
  analogWrite(sounder_pin, duty_cycle);
  delay(100);
  analogWrite(sounder_pin,0);
  delay(900);
  work_count++;
  }else{work_count=0;if(toggle_on){start_rest=true;}else{analogWrite(sounder_pin,  duty_cycle);
  delay(300);analogWrite(sounder_pin,0);};start_work=false;}
                  }
                  

if (start_rest){

  TCCR2B  = TCCR2B & 0b11111000 | low_frequency;//PWM frequency
  
  if(rest_count!=rest_array[rest_level]){
  analogWrite(sounder_pin, duty_cycle);//pin,frequency,duration in milliseconds
  delay(100);
  analogWrite(sounder_pin,0);
  delay(900);
  rest_count++;
  }else{rest_count=0;if(toggle_on){start_work=true;}else{analogWrite(sounder_pin,  duty_cycle);//pin,frequency,duration in milliseconds
  delay(300);analogWrite(sounder_pin,0);};start_rest=false;}
                  }
/**/
                         
}//end of program

  
  


  
}/*end of loop*/

//my_functions

ISR(TIMER1_COMPA_vect)          // timer compare interrupt service routine
{

//read buttons
  uint8_t temp=0x00;
/*
 * //rough values from read of analog buttons
636  //select  - togggle
408 //left    - start work
254 //donwn   - increment work
101  //up      - increment rest
0   //right   - start rest
*/  
 if (analogRead(0)  > 600  && analogRead(0) < 650){temp|=1<<0;} //btnTOGGLE  
 if (analogRead(0)  > 380 && analogRead(0) < 450){temp|=1<<1;} //btnSTART_WORK
 if (analogRead(0)  > 200 && analogRead(0) < 300){temp|=1<<2;} //btnUP_WORK
 if (analogRead(0) >  50 && analogRead(0) < 150){temp|=1<<3;} //btnUP_REST
 if (analogRead(0) >= 0  && analogRead(0) < 45){temp|=1<<4;} //btnSTART_REST
 
//debounce
  uint8_t  i,j;
  State[Index]= temp;
  ++Index;
  j=0xFF;
  for (i=0;i<MAX_CHECKS;i++){j=j&State[i];}
  Debounced_State=j;
  if(Index>=MAX_CHECKS){Index=0;} 
}


//my_screen_functions
void  update_display(long int work_period, long int rest_period, bool toggle_on)
{
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Work  Rest Togg");
  lcd.setCursor(1,1);
  lcd.print(work_period);
  lcd.setCursor(7,1);
  lcd.print(rest_period);
  lcd.setCursor(11,1);
  if (toggle_on){lcd.print("True");}else{lcd.print("False");}
  }//end of update screen

Fintess timer code

c_cpp

1
2//simple fitness timer 
3//
4
5/*
6 The circuit:
7
8 *
9  1* sounder pin 3
10
11 * LCD shield:
12 * Backlight - pin 10 removed
13 * B4
14  to D4
15 * B5 to D5
16 * B6 to D6
17 * B7 to D7 
18 * RS to D8
19 * E to D9
20
21  * 
22 * LCD shield buttons:
23 * Analog 0
24*/
25
26//CHECK TO SEE IF LCD IS
27  ONE OF THE FAULTY ONES
28//MINE HAD PROBLEMS SO I DESOLDERED AND REMOVED THE FAULTY
29  PIN 10
30//REFERENCE - https://forum.arduino.cc/index.php?topic=96747.0 (Retrieved
31  7/June/2019)
32//for the LCD shield
33//my_aliases
34
35//for the LCD shield
36#include
37  <LiquidCrystal.h>
38
39// select the pins used on the LCD panel
40LiquidCrystal
41  lcd(8, 9, 4, 5, 6, 7);
42// http://www.robotshop.com/content/PDF/dfrobot-lcd-keypad-shield-schematic.pdf
43  
44
45//required to debounce switch
46#define MAX_CHECKS 10
47volatile uint8_t
48  Debounced_State=0;//accessed by isr and main loop code
49uint8_t State[MAX_CHECKS]={0};
50uint8_t
51  Index=0;
52
53//for the buzzer  
54const int sounder_pin=3;//  the PWM pin the
55  buzzer is attached to
56int duty_cycle = 127;         // 0-255 so 50% = 127 approx
57int
58  hi_frequency=0x02;
59const int low_frequency=0x03;
60
61//seconds for work and
62  rest periods and set toggle to false
63const long int work_array[]={20,30,60,90};
64const
65  int work_array_max=3;
66const long int rest_array[]={20,30,60,90};
67const int
68  rest_array_max=3;
69bool toggle_on=false;
70
71void setup() {
72
73//initial
74  lcd setup
75  lcd.begin(16,2);   // initialize the lcd for 16 chars 2 lines, turn
76  on backlight   
77  lcd.clear();
78
79  update_display(work_array[0],rest_array[0],false);
80
81  delay(5000);
82
83  // initialize digital pin as an output.
84  pinMode(sounder_pin,
85  OUTPUT);
86
87      // initialize timer1 
88  noInterrupts();           // disable
89  all interrupts
90  TCCR1A = 0;
91  TCCR1B = 0;
92  TCNT1  = 0;
93
94  OCR1A
95  = 625;              // compare match register  16MHX/256/100HZ 
96  TCCR1B |= (1
97  << WGM12);   // CTC mode
98  TCCR1B |= (1 << CS12);    // 256 prescaler 
99  TIMSK1
100  |= (1 << OCIE1A);  // enable timer compare interrupt
101  interrupts();
102
103
104}/*end
105  of setup*/
106
107void loop() {
108
109//variables
110bool count_updated=true;
111bool
112  toggle_pressed=false;
113bool work_updated=false;
114bool rest_updated=false;
115bool
116  start_work=false;
117bool start_rest=false;
118
119static bool button_up=false;
120static
121  bool chord_ready=false;
122static int Stored_State=0;
123static int Action_Me=0;
124
125static
126  bool enter_pressed=false;
127
128static int work_level=0;
129static int rest_level=0;
130
131static
132  int work_count=0;
133static int rest_count=0;
134
135static bool work_done=false;
136static
137  bool rest_done=false;
138 
139while(1){
140
141    noInterrupts();           //
142  disable all interrupts    
143if (Debounced_State>Stored_State){Stored_State=Debounced_State;chord_ready=true;}//store
144  chord and flag as ready
145if (Debounced_State<Stored_State){if(chord_ready){button_up=true;Action_Me=Stored_State;}Stored_State=Debounced_State;}
146  
147    interrupts();             // enable all interrupts
148
149if(button_up &&
150  chord_ready)
151{
152chord_ready=false;
153button_up=false;
154
155if (Action_Me&1<<0){toggle_pressed=true;}//toggle
156  button                      
157if (Action_Me&1<<2){work_updated=true;}//work button
158if
159  (Action_Me&1<<3){rest_updated=true;}//rest button
160
161if (Action_Me&1<<1){start_work=true;}//start
162  work button
163if (Action_Me&1<<4){start_rest=true;}//start rest button
164/**/
165
166}
167
168  
169  if (toggle_pressed){
170  
171  count_updated=false;
172  toggle_pressed=false;
173  
174  toggle_on=!toggle_on;
175  update_display(work_array[work_level],rest_array[rest_level],toggle_on);
176                 
177                    }
178
179if (work_updated){
180  
181  //enter_pressed=false;
182
183  work_updated=false;
184  work_level++;
185  if (work_level>work_array_max){work_level=0;}
186
187  update_display(work_array[work_level],rest_array[rest_level],toggle_on);
188                  }
189
190if
191  (rest_updated){
192  
193  //enter_pressed=false;
194  rest_updated=false;
195  rest_level++;
196
197  if (rest_level>rest_array_max){rest_level=0;}
198  update_display(work_array[work_level],rest_array[rest_level],toggle_on);
199
200                  }                  
201
202if (start_work){
203
204  TCCR2B =
205  TCCR2B & 0b11111000 | hi_frequency;//PWM frequency
206  
207  if(work_count!=work_array[work_level]
208  && !work_done){
209  analogWrite(sounder_pin, duty_cycle);
210  delay(100);
211
212  analogWrite(sounder_pin,0);
213  delay(900);
214  work_count++;
215  }else{work_count=0;if(toggle_on){start_rest=true;}else{analogWrite(sounder_pin,
216  duty_cycle);
217  delay(300);analogWrite(sounder_pin,0);};start_work=false;}
218
219                  }
220                  
221
222if (start_rest){
223
224  TCCR2B
225  = TCCR2B & 0b11111000 | low_frequency;//PWM frequency
226  
227  if(rest_count!=rest_array[rest_level]){
228
229  analogWrite(sounder_pin, duty_cycle);//pin,frequency,duration in milliseconds
230
231  delay(100);
232  analogWrite(sounder_pin,0);
233  delay(900);
234  rest_count++;
235
236  }else{rest_count=0;if(toggle_on){start_work=true;}else{analogWrite(sounder_pin,
237  duty_cycle);//pin,frequency,duration in milliseconds
238  delay(300);analogWrite(sounder_pin,0);};start_rest=false;}
239
240                  }
241/**/
242                         
243}//end of program
244
245
246  
247  
248
249
250  
251}/*end of loop*/
252
253//my_functions
254
255ISR(TIMER1_COMPA_vect)
256          // timer compare interrupt service routine
257{
258
259//read buttons
260
261  uint8_t temp=0x00;
262/*
263 * //rough values from read of analog buttons
264636
265  //select  - togggle
266408 //left    - start work
267254 //donwn   - increment work
268101
269  //up      - increment rest
2700   //right   - start rest
271*/  
272 if (analogRead(0)
273  > 600  && analogRead(0) < 650){temp|=1<<0;} //btnTOGGLE  
274 if (analogRead(0)
275  > 380 && analogRead(0) < 450){temp|=1<<1;} //btnSTART_WORK
276 if (analogRead(0)
277  > 200 && analogRead(0) < 300){temp|=1<<2;} //btnUP_WORK
278 if (analogRead(0) >
279  50 && analogRead(0) < 150){temp|=1<<3;} //btnUP_REST
280 if (analogRead(0) >= 0
281  && analogRead(0) < 45){temp|=1<<4;} //btnSTART_REST
282 
283//debounce
284  uint8_t
285  i,j;
286  State[Index]= temp;
287  ++Index;
288  j=0xFF;
289  for (i=0;i<MAX_CHECKS;i++){j=j&State[i];}
290
291  Debounced_State=j;
292  if(Index>=MAX_CHECKS){Index=0;} 
293}
294
295
296//my_screen_functions
297void
298  update_display(long int work_period, long int rest_period, bool toggle_on)
299{
300
301  lcd.clear();
302  lcd.setCursor(0,0);
303  lcd.print("Work  Rest Togg");
304
305  lcd.setCursor(1,1);
306  lcd.print(work_period);
307  lcd.setCursor(7,1);
308
309  lcd.print(rest_period);
310  lcd.setCursor(11,1);
311  if (toggle_on){lcd.print("True");}else{lcd.print("False");}
312
313  }//end of update screen 
314

//simple fitness timer 
//

/*
 The circuit:

 *
  1* sounder pin 3

 * LCD shield:
 * Backlight - pin 10 removed
 * B4
  to D4
 * B5 to D5
 * B6 to D6
 * B7 to D7 
 * RS to D8
 * E to D9

  * 
 * LCD shield buttons:
 * Analog 0
*/

//CHECK TO SEE IF LCD IS
  ONE OF THE FAULTY ONES
//MINE HAD PROBLEMS SO I DESOLDERED AND REMOVED THE FAULTY
  PIN 10
//REFERENCE - https://forum.arduino.cc/index.php?topic=96747.0 (Retrieved
  7/June/2019)
//for the LCD shield
//my_aliases

//for the LCD shield
#include
  <LiquidCrystal.h>

// select the pins used on the LCD panel
LiquidCrystal
  lcd(8, 9, 4, 5, 6, 7);
// http://www.robotshop.com/content/PDF/dfrobot-lcd-keypad-shield-schematic.pdf
  

//required to debounce switch
#define MAX_CHECKS 10
volatile uint8_t
  Debounced_State=0;//accessed by isr and main loop code
uint8_t State[MAX_CHECKS]={0};
uint8_t
  Index=0;

//for the buzzer  
const int sounder_pin=3;//  the PWM pin the
  buzzer is attached to
int duty_cycle = 127;         // 0-255 so 50% = 127 approx
int
  hi_frequency=0x02;
const int low_frequency=0x03;

//seconds for work and
  rest periods and set toggle to false
const long int work_array[]={20,30,60,90};
const
  int work_array_max=3;
const long int rest_array[]={20,30,60,90};
const int
  rest_array_max=3;
bool toggle_on=false;

void setup() {

//initial
  lcd setup
  lcd.begin(16,2);   // initialize the lcd for 16 chars 2 lines, turn
  on backlight   
  lcd.clear();

  update_display(work_array[0],rest_array[0],false);

  delay(5000);

  // initialize digital pin as an output.
  pinMode(sounder_pin,
  OUTPUT);

      // initialize timer1 
  noInterrupts();           // disable
  all interrupts
  TCCR1A = 0;
  TCCR1B = 0;
  TCNT1  = 0;

  OCR1A
  = 625;              // compare match register  16MHX/256/100HZ 
  TCCR1B |= (1
  << WGM12);   // CTC mode
  TCCR1B |= (1 << CS12);    // 256 prescaler 
  TIMSK1
  |= (1 << OCIE1A);  // enable timer compare interrupt
  interrupts();


}/*end
  of setup*/

void loop() {

//variables
bool count_updated=true;
bool
  toggle_pressed=false;
bool work_updated=false;
bool rest_updated=false;
bool
  start_work=false;
bool start_rest=false;

static bool button_up=false;
static
  bool chord_ready=false;
static int Stored_State=0;
static int Action_Me=0;

static
  bool enter_pressed=false;

static int work_level=0;
static int rest_level=0;

static
  int work_count=0;
static int rest_count=0;

static bool work_done=false;
static
  bool rest_done=false;
 
while(1){

    noInterrupts();           //
  disable all interrupts    
if (Debounced_State>Stored_State){Stored_State=Debounced_State;chord_ready=true;}//store
  chord and flag as ready
if (Debounced_State<Stored_State){if(chord_ready){button_up=true;Action_Me=Stored_State;}Stored_State=Debounced_State;}
  
    interrupts();             // enable all interrupts

if(button_up &&
  chord_ready)
{
chord_ready=false;
button_up=false;

if (Action_Me&1<<0){toggle_pressed=true;}//toggle
  button                      
if (Action_Me&1<<2){work_updated=true;}//work button
if
  (Action_Me&1<<3){rest_updated=true;}//rest button

if (Action_Me&1<<1){start_work=true;}//start
  work button
if (Action_Me&1<<4){start_rest=true;}//start rest button
/**/

}

  
  if (toggle_pressed){
  
  count_updated=false;
  toggle_pressed=false;
  
  toggle_on=!toggle_on;
  update_display(work_array[work_level],rest_array[rest_level],toggle_on);
                 
                    }

if (work_updated){
  
  //enter_pressed=false;

  work_updated=false;
  work_level++;
  if (work_level>work_array_max){work_level=0;}

  update_display(work_array[work_level],rest_array[rest_level],toggle_on);
                  }

if
  (rest_updated){
  
  //enter_pressed=false;
  rest_updated=false;
  rest_level++;

  if (rest_level>rest_array_max){rest_level=0;}
  update_display(work_array[work_level],rest_array[rest_level],toggle_on);

                  }                  

if (start_work){

  TCCR2B =
  TCCR2B & 0b11111000 | hi_frequency;//PWM frequency
  
  if(work_count!=work_array[work_level]
  && !work_done){
  analogWrite(sounder_pin, duty_cycle);
  delay(100);

  analogWrite(sounder_pin,0);
  delay(900);
  work_count++;
  }else{work_count=0;if(toggle_on){start_rest=true;}else{analogWrite(sounder_pin,
  duty_cycle);
  delay(300);analogWrite(sounder_pin,0);};start_work=false;}

                  }
                  

if (start_rest){

  TCCR2B
  = TCCR2B & 0b11111000 | low_frequency;//PWM frequency
  
  if(rest_count!=rest_array[rest_level]){

  analogWrite(sounder_pin, duty_cycle);//pin,frequency,duration in milliseconds

  delay(100);
  analogWrite(sounder_pin,0);
  delay(900);
  rest_count++;

  }else{rest_count=0;if(toggle_on){start_work=true;}else{analogWrite(sounder_pin,
  duty_cycle);//pin,frequency,duration in milliseconds
  delay(300);analogWrite(sounder_pin,0);};start_rest=false;}

                  }
/**/
                         
}//end of program


  
  


  
}/*end of loop*/

//my_functions

ISR(TIMER1_COMPA_vect)
          // timer compare interrupt service routine
{

//read buttons

  uint8_t temp=0x00;
/*
 * //rough values from read of analog buttons
636
  //select  - togggle
408 //left    - start work
254 //donwn   - increment work
101
  //up      - increment rest
0   //right   - start rest
*/  
 if (analogRead(0)
  > 600  && analogRead(0) < 650){temp|=1<<0;} //btnTOGGLE  
 if (analogRead(0)
  > 380 && analogRead(0) < 450){temp|=1<<1;} //btnSTART_WORK
 if (analogRead(0)
  > 200 && analogRead(0) < 300){temp|=1<<2;} //btnUP_WORK
 if (analogRead(0) >
  50 && analogRead(0) < 150){temp|=1<<3;} //btnUP_REST
 if (analogRead(0) >= 0
  && analogRead(0) < 45){temp|=1<<4;} //btnSTART_REST
 
//debounce
  uint8_t
  i,j;
  State[Index]= temp;
  ++Index;
  j=0xFF;
  for (i=0;i<MAX_CHECKS;i++){j=j&State[i];}

  Debounced_State=j;
  if(Index>=MAX_CHECKS){Index=0;} 
}


//my_screen_functions
void
  update_display(long int work_period, long int rest_period, bool toggle_on)
{

  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Work  Rest Togg");

  lcd.setCursor(1,1);
  lcd.print(work_period);
  lcd.setCursor(7,1);

  lcd.print(rest_period);
  lcd.setCursor(11,1);
  if (toggle_on){lcd.print("True");}else{lcd.print("False");}

  }//end of update screen

Downloadable files

Shield piezo top view

You just need the piezo sounder for this project

Shield piezo top view