Example code:
Multiple Buttons: debouncing + state + counting + detecting the pressing and releasing events
#include <ezButton.h>
ezButton button1(6); // create Button object that attach to pin 6;
ezButton button2(7); // create Button object that attach to pin 7;
void setup() {
Serial.begin(9600);
button1.setDebounceTime(50); // set debounce time to 50 milliseconds
button2.setDebounceTime(50); // set debounce time to 50 milliseconds
button1.setCountMode(COUNT_FALLING);
button2.setCountMode(COUNT_FALLING);
}
void loop() {
button1.loop(); // MUST call the loop() function first
button2.loop(); // MUST call the loop() function first
int btn1State = button1.getState();
int btn2State = button2.getState();
Serial.print("button 1 state: ");
Serial.println(btn1State);
Serial.print("button 2 state: ");
Serial.println(btn2State);
unsigned long btn1Count = button1.getCount();
unsigned long btn2Count = button2.getCount();
Serial.print("button 1 count: ");
Serial.println(btn1Count);
Serial.print("button 2 count: ");
Serial.println(btn2Count);
if(button1.isPressed())
Serial.println("The button 1 is pressed");
if(button1.isReleased())
Serial.println("The button 1 is released");
if(button2.isPressed())
Serial.println("The button 2 is pressed");
if(button2.isReleased())
Serial.println("The button 2 is released");
}
When using many buttons, we can puts buttons into an array
Example of 5 buttons using array.
#include <ezButton.h>
const int BUTTON_NUM = 5;
const int BUTTON_1_PIN = 2;
const int BUTTON_2_PIN = 3;
const int BUTTON_3_PIN = 4;
const int BUTTON_4_PIN = 5;
const int BUTTON_5_PIN = 6;
ezButton buttonArray[] = {
ezButton(BUTTON_1_PIN),
ezButton(BUTTON_2_PIN),
ezButton(BUTTON_3_PIN),
ezButton(BUTTON_4_PIN),
ezButton(BUTTON_5_PIN)
};
void setup() {
Serial.begin(9600);
for(byte i = 0; i < BUTTON_NUM; i++){
buttonArray[i].setDebounceTime(50); // set debounce time to 50 milliseconds
}
}
void loop() {
for(byte i = 0; i < BUTTON_NUM; i++)
buttonArray[i].loop(); // MUST call the loop() function first
for(byte i = 0; i < BUTTON_NUM; i++) {
if(buttonArray[i].isPressed()) {
Serial.print("The button ");
Serial.print(i + 1);
Serial.println(" is pressed");
}
if(buttonArray[i].isReleased()) {
Serial.print("The button ");
Serial.print(i + 1);
Serial.println(" is released");
}
}
}
The library is also useful in the case of using a single button.
If you have any comment or suggestion, please feel free to comment here.
I've seen several tutorials on how to read a group of switches, and output something that indicates which switch has been pushed.
I'm trying to write a sketch that will allow me to read 3 switches as a binary value of 0-7, and output different text to an LCD for each of the 8 results.
Since beginners may get into trouble because of the floating input and chattering issue. I recommend using the library instead of digitalRead() function. The library used the internal pull-up resistor to avoid the floating value and implemented the debouncing to eliminate the chattering phenomenon.
IoT_hobbyist:
Great! Thank you for the additional tip.
Since beginners may get into trouble because of the floating input and chattering issue. I recommend using the library instead of digitalRead() function. The library used the internal pull-up resistor to avoid the floating value and implemented the debouncing to eliminate the chattering phenomenon.
As a newb to programming, this is a great explanation of reading the switches as a group, rather than individual switches. That's been a major stumbling block to this project so far.
I've been able to find the setup (using the buttons library and the above explanation), and display the result (using the "case" reference and experimenting with null inputs for the LCD), but the gap between the two is how to read (you recommended not using the digitalRead function?) and manage the data. I'm kinda stumped at this point.
I hate to sound like I'm asking the experts to solve my equation for me. I'd really like to figure it out myself. What I am asking the experts is if they can point me to the reference to a statement or group of statements that I can research to figure out the answer.
I get a compile error when i try to compile your array example.
Your first example compiles and runs without issue...
Any help appreciated.
Thanks
Here is the error output:
"C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.42.0_x86__mdqgnx93n4wtt\hardware\tools\avr/bin/avr-g++" -c -g -Os -Wall -Wextra -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -MMD -flto -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10813 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.42.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\cores\arduino" "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.42.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\variants\standard" "-IC:\Users\dragy\OneDrive\Documents\Arduino\libraries\ezButton\src" "C:\Users\dragy\AppData\Local\Temp\arduino_build_612579\sketch\Relay_Test_Setup1.ino.cpp" -o "C:\Users\dragy\AppData\Local\Temp\arduino_build_612579\sketch\Relay_Test_Setup1.ino.cpp.o"
C:\Users\dragy\OneDrive\Documents\Arduino\Relay_Test_Setup1\Relay_Test_Setup1.ino: In function 'void setup()':
Relay_Test_Setup1:23:17: error: request for member 'setDebounceTime' in 'buttonArray', which is of non-class type 'ezButton [5]'
buttonArray.setDebounceTime(50); // set debounce time to 50 milliseconds
^~~~~~~~~~~~~~~
C:\Users\dragy\OneDrive\Documents\Arduino\Relay_Test_Setup1\Relay_Test_Setup1.ino: In function 'void loop()':
Relay_Test_Setup1:29:17: error: request for member 'loop' in 'buttonArray', which is of non-class type 'ezButton [5]'
buttonArray.loop(); // MUST call the loop() function first
^~~~
Relay_Test_Setup1:32:21: error: request for member 'isPressed' in 'buttonArray', which is of non-class type 'ezButton [5]'
if (buttonArray.isPressed()) {
^~~~~~~~~
Relay_Test_Setup1:38:21: error: request for member 'isReleased' in 'buttonArray', which is of non-class type 'ezButton [5]'
if (buttonArray.isReleased()) {
^~~~~~~~~~
Using library ezButton at version 1.0.3 in folder: C:\Users\dragy\OneDrive\Documents\Arduino\libraries\ezButton
exit status 1
request for member 'setDebounceTime' in 'buttonArray', which is of non-class type 'ezButton [5]'
HI thanks for replying... I used a direct copy of your array example (I've copied it out of my sketch in case I dropped a character on the initial copy).
#include <ezButton.h>
const int BUTTON_NUM = 5;
const int BUTTON_1_PIN = 2;
const int BUTTON_2_PIN = 3;
const int BUTTON_3_PIN = 4;
const int BUTTON_4_PIN = 5;
const int BUTTON_5_PIN = 6;
ezButton buttonArray[] = {
ezButton(BUTTON_1_PIN),
ezButton(BUTTON_2_PIN),
ezButton(BUTTON_3_PIN),
ezButton(BUTTON_4_PIN),
ezButton(BUTTON_5_PIN)
};
void setup() {
Serial.begin(9600);
for (byte i = 0; i < BUTTON_NUM; i++) {
buttonArray.setDebounceTime(50); // set debounce time to 50 milliseconds
}
}
void loop() {
for (byte i = 0; i < BUTTON_NUM; i++)
buttonArray.loop(); // MUST call the loop() function first
for (byte i = 0; i < BUTTON_NUM; i++) {
if (buttonArray.isPressed()) {
Serial.print("The button ");
Serial.print(i + 1);
Serial.println(" is pressed");
}
if (buttonArray.isReleased()) {
Serial.print("The button ");
Serial.print(i + 1);
Serial.println(" is released");
}
}
}
