hi there;
I got arduino mega adk and it looks like pinout for adk is different
http://forum.arduino.cc/index.php?topic=45329.0
void setup() {
// put your setup code here, to run once:
pinMode(5, INPUT);
Serial.begin(115200);
}
void loop() {
// put your main code here, to run repeatedly:
Serial.print("porte3: ");
Serial.println(bitRead(PORTE, 3));
Serial.print("digiR5: ");
Serial.println(digitalRead(5));
}
my output is:
porte3: 0
digiR5: 1
why?
thx
You get current pin state with the PIN registers, not PORT. An input pin with nothing connected to it can read high or low at random - it's floating, so it will pick up noise from the environment like an antenna.
PORT is the OUTPUT register.
PINA, PINB, ....
@Whandall can you pls put some links?
I knows about PINA, PINB but this works for uno I wasnt able to ggl input pins for mega, thx
The registers are documented in the datasheet, the mapping to pins probably in your links.
Whandall:
The registers are documented in the datasheet, the mapping to pins probably in your links.
Or look at Uno & Mega schematics on the Product page.
when Whandall gives me the answer, I dont get it. Thats why I was asking for a links, but later I did understand his answer 
Sorry, sometimes I seem to write too cryptical
and maybe too focused on answering (just) the question. 