I not sure if the Mega2560 has the pull down resistors turned on
220 Ohm resistor (red red yellow).
There are NO internal PULLDOWN resisters, only Pullup.
Here is my quarter.
Please enter a valid email to subscribe
We need to confirm your email address.
To complete the subscription, please click the link in the
email we just sent you.
Thank you for subscribing!
via Egeo 16