10 Buttons Using 1 Interrupt

Connect up to 10 buttons using a single interrupt.

May 5, 2019

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63277 views

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41 respects

low power

button

interrupt

Components and supplies

Tactile Switch, Top Actuated

Breadboard (generic)

Jumper wires (generic)

Arduino UNO

Apps and platforms

Arduino IDE

Project description

Code

Serial logger

arduino

1const int commonPin = 2;
2const int buttonPins[] = {4,5,6,7,8,9,10,11,12,13};
3
4unsigned  long lastFire = 0;
5
6void setup() {
7  configureCommon(); // Setup pins for  interrupt
8
9  attachInterrupt(digitalPinToInterrupt(commonPin), pressInterrupt,  FALLING);
10
11  Serial.begin(9600);
12}
13
14void loop() {
15  // Empty!
16}
17
18void  pressInterrupt() { // ISR
19  if (millis() - lastFire < 200) { // Debounce
20    return;
21  }
22  lastFire = millis();
23
24  configureDistinct(); // Setup  pins for testing individual buttons
25
26  for (int i = 0; i < sizeof(buttonPins)  / sizeof(int); i++) { // Test each button for press
27    if (!digitalRead(buttonPins[i]))  {
28      press(i);
29    }
30  }
31
32  configureCommon(); // Return to original  state
33}
34
35void configureCommon() {
36  pinMode(commonPin, INPUT_PULLUP);
37
38  for (int i = 0; i < sizeof(buttonPins) / sizeof(int); i++) {
39    pinMode(buttonPins[i],  OUTPUT);
40    digitalWrite(buttonPins[i], LOW);
41  }
42}
43
44void configureDistinct()  {
45  pinMode(commonPin, OUTPUT);
46  digitalWrite(commonPin, LOW);
47
48  for  (int i = 0; i < sizeof(buttonPins) / sizeof(int); i++) {
49    pinMode(buttonPins[i],  INPUT_PULLUP);
50  }
51}
52
53void press(int button) { // Our handler
54  Serial.println(button  + 1);
55}

const int commonPin = 2;
const int buttonPins[] = {4,5,6,7,8,9,10,11,12,13};

unsigned  long lastFire = 0;

void setup() {
  configureCommon(); // Setup pins for  interrupt

  attachInterrupt(digitalPinToInterrupt(commonPin), pressInterrupt,  FALLING);

  Serial.begin(9600);
}

void loop() {
  // Empty!
}

void  pressInterrupt() { // ISR
  if (millis() - lastFire < 200) { // Debounce
    return;
  }
  lastFire = millis();

  configureDistinct(); // Setup  pins for testing individual buttons

  for (int i = 0; i < sizeof(buttonPins)  / sizeof(int); i++) { // Test each button for press
    if (!digitalRead(buttonPins[i]))  {
      press(i);
    }
  }

  configureCommon(); // Return to original  state
}

void configureCommon() {
  pinMode(commonPin, INPUT_PULLUP);

  for (int i = 0; i < sizeof(buttonPins) / sizeof(int); i++) {
    pinMode(buttonPins[i],  OUTPUT);
    digitalWrite(buttonPins[i], LOW);
  }
}

void configureDistinct()  {
  pinMode(commonPin, OUTPUT);
  digitalWrite(commonPin, LOW);

  for  (int i = 0; i < sizeof(buttonPins) / sizeof(int); i++) {
    pinMode(buttonPins[i],  INPUT_PULLUP);
  }
}

void press(int button) { // Our handler
  Serial.println(button  + 1);
}

Servo with sleep mode

arduino

1#include <Servo.h>
2#include <avr/sleep.h>
3#include <avr/power.h>
4
5const  int commonPin = 2;
6const int buttonPins[] = {4,5,6,7,8,9,10,11,12,13};
7
8const  int servoEnablePin = A1;
9const int servoPin = A0;
10Servo servo;
11
12unsigned  long lastFire = 0;
13int status = 0;
14
15void setup() {
16  pinMode(commonPin,  INPUT_PULLUP);
17  
18  configureCommon();
19  
20  attachInterrupt(digitalPinToInterrupt(commonPin),  pressInterrupt, FALLING);
21
22  servo.attach(servoPin);
23  pinMode(servoEnablePin,  OUTPUT);
24}
25
26void loop() {
27  if (millis()-lastFire > 5000) {
28    digitalWrite(servoEnablePin,  LOW);
29    
30    set_sleep_mode(SLEEP_MODE_PWR_DOWN);
31    sleep_enable();  
32    sleep_mode();
33  }
34
35  delay(10);
36}
37
38void pressInterrupt()  {
39  sleep_disable();
40  power_all_enable();
41  
42  if (millis()-lastFire  < 200) {
43    return;
44  }
45  lastFire = millis();
46  
47  configureDistinct();
48
49  for (int i=0;i<sizeof(buttonPins)/sizeof(int);i++) {
50    if (!digitalRead(buttonPins[i]))  {
51      press(i);
52    }
53  }
54
55  configureCommon();
56}
57
58void  configureCommon() {
59  pinMode(commonPin, INPUT_PULLUP);
60  
61  for (int i=0;i<sizeof(buttonPins)/sizeof(int);i++)  {
62    pinMode(buttonPins[i], OUTPUT);
63    digitalWrite(buttonPins[i], LOW);
64  }
65}
66
67void configureDistinct() {
68  pinMode(commonPin, OUTPUT);
69  digitalWrite(commonPin, LOW);
70  
71  for (int i=0;i<sizeof(buttonPins)/sizeof(int);i++)  {
72    pinMode(buttonPins[i], INPUT_PULLUP);
73  }
74}
75
76void press(int  button) {
77  digitalWrite(servoEnablePin, HIGH);
78  servo.write(map(button,0,9,0,180));
79}

#include <Servo.h>
#include <avr/sleep.h>
#include <avr/power.h>

const  int commonPin = 2;
const int buttonPins[] = {4,5,6,7,8,9,10,11,12,13};

const  int servoEnablePin = A1;
const int servoPin = A0;
Servo servo;

unsigned  long lastFire = 0;
int status = 0;

void setup() {
  pinMode(commonPin,  INPUT_PULLUP);
  
  configureCommon();
  
  attachInterrupt(digitalPinToInterrupt(commonPin),  pressInterrupt, FALLING);

  servo.attach(servoPin);
  pinMode(servoEnablePin,  OUTPUT);
}

void loop() {
  if (millis()-lastFire > 5000) {
    digitalWrite(servoEnablePin,  LOW);
    
    set_sleep_mode(SLEEP_MODE_PWR_DOWN);
    sleep_enable();  
    sleep_mode();
  }

  delay(10);
}

void pressInterrupt()  {
  sleep_disable();
  power_all_enable();
  
  if (millis()-lastFire  < 200) {
    return;
  }
  lastFire = millis();
  
  configureDistinct();

  for (int i=0;i<sizeof(buttonPins)/sizeof(int);i++) {
    if (!digitalRead(buttonPins[i]))  {
      press(i);
    }
  }

  configureCommon();
}

void  configureCommon() {
  pinMode(commonPin, INPUT_PULLUP);
  
  for (int i=0;i<sizeof(buttonPins)/sizeof(int);i++)  {
    pinMode(buttonPins[i], OUTPUT);
    digitalWrite(buttonPins[i], LOW);
  }
}

void configureDistinct() {
  pinMode(commonPin, OUTPUT);
  digitalWrite(commonPin, LOW);
  
  for (int i=0;i<sizeof(buttonPins)/sizeof(int);i++)  {
    pinMode(buttonPins[i], INPUT_PULLUP);
  }
}

void press(int  button) {
  digitalWrite(servoEnablePin, HIGH);
  servo.write(map(button,0,9,0,180));
}

Serial logger

arduino

1const int commonPin = 2;
2const int buttonPins[] = {4,5,6,7,8,9,10,11,12,13};
3
4unsigned   long lastFire = 0;
5
6void setup() {
7  configureCommon(); // Setup pins for   interrupt
8
9  attachInterrupt(digitalPinToInterrupt(commonPin), pressInterrupt,   FALLING);
10
11  Serial.begin(9600);
12}
13
14void loop() {
15  // Empty!
16}
17
18void   pressInterrupt() { // ISR
19  if (millis() - lastFire < 200) { // Debounce
20     return;
21  }
22  lastFire = millis();
23
24  configureDistinct(); // Setup   pins for testing individual buttons
25
26  for (int i = 0; i < sizeof(buttonPins)   / sizeof(int); i++) { // Test each button for press
27    if (!digitalRead(buttonPins[i]))   {
28      press(i);
29    }
30  }
31
32  configureCommon(); // Return to original   state
33}
34
35void configureCommon() {
36  pinMode(commonPin, INPUT_PULLUP);
37
38   for (int i = 0; i < sizeof(buttonPins) / sizeof(int); i++) {
39    pinMode(buttonPins[i],   OUTPUT);
40    digitalWrite(buttonPins[i], LOW);
41  }
42}
43
44void configureDistinct()   {
45  pinMode(commonPin, OUTPUT);
46  digitalWrite(commonPin, LOW);
47
48  for   (int i = 0; i < sizeof(buttonPins) / sizeof(int); i++) {
49    pinMode(buttonPins[i],   INPUT_PULLUP);
50  }
51}
52
53void press(int button) { // Our handler
54  Serial.println(button   + 1);
55}

const int commonPin = 2;
const int buttonPins[] = {4,5,6,7,8,9,10,11,12,13};

unsigned   long lastFire = 0;

void setup() {
  configureCommon(); // Setup pins for   interrupt

  attachInterrupt(digitalPinToInterrupt(commonPin), pressInterrupt,   FALLING);

  Serial.begin(9600);
}

void loop() {
  // Empty!
}

void   pressInterrupt() { // ISR
  if (millis() - lastFire < 200) { // Debounce
     return;
  }
  lastFire = millis();

  configureDistinct(); // Setup   pins for testing individual buttons

  for (int i = 0; i < sizeof(buttonPins)   / sizeof(int); i++) { // Test each button for press
    if (!digitalRead(buttonPins[i]))   {
      press(i);
    }
  }

  configureCommon(); // Return to original   state
}

void configureCommon() {
  pinMode(commonPin, INPUT_PULLUP);

   for (int i = 0; i < sizeof(buttonPins) / sizeof(int); i++) {
    pinMode(buttonPins[i],   OUTPUT);
    digitalWrite(buttonPins[i], LOW);
  }
}

void configureDistinct()   {
  pinMode(commonPin, OUTPUT);
  digitalWrite(commonPin, LOW);

  for   (int i = 0; i < sizeof(buttonPins) / sizeof(int); i++) {
    pinMode(buttonPins[i],   INPUT_PULLUP);
  }
}

void press(int button) { // Our handler
  Serial.println(button   + 1);
}

Servo with sleep mode

arduino

1#include <Servo.h>
2#include <avr/sleep.h>
3#include <avr/power.h>
4
5const   int commonPin = 2;
6const int buttonPins[] = {4,5,6,7,8,9,10,11,12,13};
7
8const   int servoEnablePin = A1;
9const int servoPin = A0;
10Servo servo;
11
12unsigned   long lastFire = 0;
13int status = 0;
14
15void setup() {
16  pinMode(commonPin,   INPUT_PULLUP);
17  
18  configureCommon();
19  
20  attachInterrupt(digitalPinToInterrupt(commonPin),   pressInterrupt, FALLING);
21
22  servo.attach(servoPin);
23  pinMode(servoEnablePin,   OUTPUT);
24}
25
26void loop() {
27  if (millis()-lastFire > 5000) {
28    digitalWrite(servoEnablePin,   LOW);
29    
30    set_sleep_mode(SLEEP_MODE_PWR_DOWN);
31    sleep_enable();   
32    sleep_mode();
33  }
34
35  delay(10);
36}
37
38void pressInterrupt()   {
39  sleep_disable();
40  power_all_enable();
41  
42  if (millis()-lastFire   < 200) {
43    return;
44  }
45  lastFire = millis();
46  
47  configureDistinct();
48
49   for (int i=0;i<sizeof(buttonPins)/sizeof(int);i++) {
50    if (!digitalRead(buttonPins[i]))   {
51      press(i);
52    }
53  }
54
55  configureCommon();
56}
57
58void   configureCommon() {
59  pinMode(commonPin, INPUT_PULLUP);
60  
61  for (int i=0;i<sizeof(buttonPins)/sizeof(int);i++)   {
62    pinMode(buttonPins[i], OUTPUT);
63    digitalWrite(buttonPins[i], LOW);
64   }
65}
66
67void configureDistinct() {
68  pinMode(commonPin, OUTPUT);
69   digitalWrite(commonPin, LOW);
70  
71  for (int i=0;i<sizeof(buttonPins)/sizeof(int);i++)   {
72    pinMode(buttonPins[i], INPUT_PULLUP);
73  }
74}
75
76void press(int   button) {
77  digitalWrite(servoEnablePin, HIGH);
78  servo.write(map(button,0,9,0,180));
79}

#include <Servo.h>
#include <avr/sleep.h>
#include <avr/power.h>

const   int commonPin = 2;
const int buttonPins[] = {4,5,6,7,8,9,10,11,12,13};

const   int servoEnablePin = A1;
const int servoPin = A0;
Servo servo;

unsigned   long lastFire = 0;
int status = 0;

void setup() {
  pinMode(commonPin,   INPUT_PULLUP);
  
  configureCommon();
  
  attachInterrupt(digitalPinToInterrupt(commonPin),   pressInterrupt, FALLING);

  servo.attach(servoPin);
  pinMode(servoEnablePin,   OUTPUT);
}

void loop() {
  if (millis()-lastFire > 5000) {
    digitalWrite(servoEnablePin,   LOW);
    
    set_sleep_mode(SLEEP_MODE_PWR_DOWN);
    sleep_enable();   
    sleep_mode();
  }

  delay(10);
}

void pressInterrupt()   {
  sleep_disable();
  power_all_enable();
  
  if (millis()-lastFire   < 200) {
    return;
  }
  lastFire = millis();
  
  configureDistinct();

   for (int i=0;i<sizeof(buttonPins)/sizeof(int);i++) {
    if (!digitalRead(buttonPins[i]))   {
      press(i);
    }
  }

  configureCommon();
}

void   configureCommon() {
  pinMode(commonPin, INPUT_PULLUP);
  
  for (int i=0;i<sizeof(buttonPins)/sizeof(int);i++)   {
    pinMode(buttonPins[i], OUTPUT);
    digitalWrite(buttonPins[i], LOW);
   }
}

void configureDistinct() {
  pinMode(commonPin, OUTPUT);
   digitalWrite(commonPin, LOW);
  
  for (int i=0;i<sizeof(buttonPins)/sizeof(int);i++)   {
    pinMode(buttonPins[i], INPUT_PULLUP);
  }
}

void press(int   button) {
  digitalWrite(servoEnablePin, HIGH);
  servo.write(map(button,0,9,0,180));
}

Downloadable files

Serial logger - Fritzing file

Servo with sleep - Fritzing file

Serial logger

Servo with sleep - Fritzing file

Servo with sleep

Serial logger

Serial logger - Fritzing file

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Downloadable files