Arduino Mega Pins Problems!

Development Tools IDE 1.x
1

Hello,

First, i have an adrduino board "MEGA 2560" and i wanna use the 22-53 digitals pins, to turn off a led? To be exacly pin: 43
Here is my code:

int led43 = 43;

void setup() {               

  pinMode(led43, OUTPUT);
 
 
}

void loop() {
  digitalWrite(led39, HIGH);
  delay(200);
}

And when i apply this to the board its not working! Thanks!

2

You set pinmode on pin 43, then write le39,HIGH

You DO have a current limiting resistor in series with the LED?

3

i dont? its an 5v?

4

Ok... But if i wanna use that pin for a pin for a keypad its not working!!

5

You can't run an LED without a current limiting resistor, you WILL distroy the LED, and MAY damage the output pin.

Ok... But if i wanna use that pin for a pin for a keypad its not working!!

So, post your code, and a schematic of your wiring.