Multiple Button Issue

[patrickgardella]

I am running into problems using Button2 with multiple buttons. I thought it might be something I was coding wrong, but I have this exact same problem with the "Multiple Buttons" example that comes with the library.

I have two buttons connected to an Arduino Uno Rev 3 on pins 7 & 8. (The other lead to the button is connected to the ground pins.) I'm connected to my Linux desktop through /dev/ttyACM1 (USB).

Everything works fine for about 15-20 seconds, as I randomly press the buttons. Then things begin to slow. I can press Button A multiple times, and only see one line print in the Serial Monitor. Or alternate and see an occasional A or B show up. Maybe 1 line out of 8 or 10 button pushes.

I don't think its the serial connection or monitor, because my original code uses LEDs to indicate a button has been pushed, and they show the same random push behavior.

And If I just test one of the buttons at a time, using the "Single Button" example (on pins 7 or 8) everything is fine and works as expected. I don't change the wiring, only the example code I'm using.

I'm working on a build where I'll have many buttons, not just two, so I want to make this work.

How can I better debug this to figure out what is going wrong?

FWIW, here is the diagnostic details from avrdude:

         Using Port                    : /dev/ttyACM1
         Using Programmer              : arduino
         Overriding Baud Rate          : 115200
         AVR Part                      : ATmega328P
         Chip Erase delay              : 9000 us
         PAGEL                         : PD7
         BS2                           : PC2
         RESET disposition             : dedicated
         RETRY pulse                   : SCK
         serial program mode           : yes
         parallel program mode         : yes
         Timeout                       : 200
         StabDelay                     : 100
         CmdexeDelay                   : 25
         SyncLoops                     : 32
         ByteDelay                     : 0
         PollIndex                     : 3
         PollValue                     : 0x53
         Memory Detail                 :

                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           eeprom        65    20     4    0 no       1024    4      0  3600  3600 0xff 0xff
           flash         65     6   128    0 yes     32768  128    256  4500  4500 0xff 0xff
           lfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           hfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           efuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           lock           0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00
           signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00

         Programmer Type : Arduino
         Description     : Arduino
         Hardware Version: 3
         Firmware Version: 4.4
         Vtarget         : 0.3 V
         Varef           : 0.3 V
         Oscillator      : 28.800 kHz
         SCK period      : 3.3 us