Using 4x4 Keypad GPIO 15 and 2
Posted: Wed Dec 30, 2020 11:29 am
Hey all,
I am trying to use a 4x4 Matrix Keypad on my NodeMCU esp32 board following this tutorial:
diyi0t.com
I want to use the pins 15, 2, 4, 16, 17, 5, 18, 19 but I get weird results (three buttons hand back the value of other buttons).
When I use the Pins 4, 16, 17, 5, 18, 19, 21, 3 (or other Pins) everything is fine, so I guess there must be a problem with the Pins 15 and 2.
I know that they have special behavior at boot, but I guess that should not be a probleme for the keypad or?
And Pin 2 is conected to the internal LED, might that be a problem?
I tried several boards and keypads so it seems not to be a defect hardware problem.
Is there something special with this pins so that i cant use them for the keypad? Or can it be solved somehow?
I am trying to use a 4x4 Matrix Keypad on my NodeMCU esp32 board following this tutorial:
diyi0t.com
I want to use the pins 15, 2, 4, 16, 17, 5, 18, 19 but I get weird results (three buttons hand back the value of other buttons).
When I use the Pins 4, 16, 17, 5, 18, 19, 21, 3 (or other Pins) everything is fine, so I guess there must be a problem with the Pins 15 and 2.
I know that they have special behavior at boot, but I guess that should not be a probleme for the keypad or?
And Pin 2 is conected to the internal LED, might that be a problem?
I tried several boards and keypads so it seems not to be a defect hardware problem.
Is there something special with this pins so that i cant use them for the keypad? Or can it be solved somehow?