by

|   November  1, 2008 at 1:14 PM

Hi

Is there a board that will fit on under this board to bring all the pins to one side and also make it easier to control


Thanks

by

|   December  1, 2008 at 12:37 AM

This does not work well. Been testing this for use in my senior project with the 16 button pad and frusterated to find it is HIGHLY affected by static. Simply placing my hand near the buttons is enough to connect any of the white circular connecters. I am trying different methods of solving this so far with nothing working exceptionally well.

by

|   December  3, 2008 at 9:48 AM

Hmm - this is the first problem with static we've heard. You must have a very large static build up to cause a switch closure.

by

|   December  4, 2008 at 10:07 AM

Make sure you're using pull-up resistors on the buttons, they are not included on the board. You can do this either by modifying they hardware or by using internal pull-ups on the microcontroller you're using. The internal pull-ups is by far the easier option.

Without the pull-ups on the button, they will not work very well. I don't know why putting your finger in front of the button makes the "connection," but I've seen the same result when I don't use pull-ups.

by

|   December  4, 2008 at 12:12 AM

After the suggestions the board worked fine. Thanks for the help, hope they are useful to future people working with this board.

by

|   April 24, 2009 at 4:41 PM

I think I understand the switch and LED matrix. But if I understand correctly, if I turn on Red (for example) on the top row, then red will be on for all 4 columns on the top row. In other words, I can't have the top row be red, red, blue, blue. Instead it would be red, red, purple, purple. Is this correct?

by

|   June  2, 2009 at 1:20 AM

Does this pad essentially work on the row/column concept of the telephone style keypad?

by

|   August 11, 2009 at 6:03 AM

This is correct. To have red-red-blue-blue you have to enable Row1 red and then enable Column1 and Column2 GND only. Then you'd have to enable Row1 blue and Column3 and Column4 GND. This is not a very efficient method especially for LEDs as the maximum duty cycle was just reduced to 50% for every LED on that row. It is then further reduced if any time is spent serially updating the other rows. If each row/column can be scanned simultaneously, e.g. with a shift register, then you are better off but still at 50%. Add in the third color and you've just reduced it to 33%.

by

|   November 23, 2009 at 2:25 PM

can i use this as just push buttons?