Mega 2560 Digital Pins Usage

Projects Programming
1

I am using the Mega 2560 in a project need to control pins 2 thru 53. . Looking at the Mega pin outs the ports are not in order , so what is need to enable me to be able to control the pins correctly?

2

Put them in an array, access them that way.

byte pinsArray[] = {2,3,4,5,6,7,8 .... etc up to 53,};

digitalWrite (pinsArray[0], LOW); // etc/
3

Thank You for that Idea,but I need to control them individually and assign name to them like Relay1, Relay2, Track1 , Etc. Turn the pin High or LOW I need to keep this simple.

5

There is something different on the Mega 2560 for pins 14 thur 53 it is not working like what you are showing here. I think you need to set up those pins differently. check this link out

http://tronixstuff.com/2011/10/22/tutorial-arduino-port-manipulation/

7

This is the code I am using. Pin 2 thru pin 21 toggle. When I try pin 22 is High.

int led = 13;
int led2 = 2;
int led3 = 3;
int led4 = 4;
int led5 = 5;
int led6 = 6;
int led7 = 7;
int led8 = 8;
int led9 = 9;
int led10 = 10;
int led11 = 11;
int led12 = 12;
int led14 = 14;
int led15 = 15;
int led16 = 16;
int led17 = 17;
int led18 = 18;
int led19 = 19;
int led20 = 20;
int led21 = 21;
int led22 = 22;
int led23 = 23;
int led24 = 24;
int led25 = 25;
int led26 = 26;
int led27 = 27;
int led28 = 28;
int led29 = 29;
int led30 = 30;
int led31 = 31;
int led32 = 32;
int led33 = 33;
int led34 = 34;
int led35 = 35;
int led36 = 36;
int led37 = 37;
int led38 = 38;
int led39 = 39;
int led40 = 40;
int led41 = 41;
int led42 = 42;
int led43 = 43;
int led44 = 44;
int led45 = 45;
int led46 = 46;
int led47 = 47;
int led48 = 48;
int led49 = 49;
int led50 = 50;
int led51 = 51;
int led52 = 52;
int led53 = 53;

// the setup routine runs once when you press reset:
void setup() {
// initialize the digital pin as an output.
pinMode(led, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
pinMode(led4, OUTPUT);
pinMode(led5, OUTPUT);
pinMode(led6, OUTPUT);
pinMode(led7, OUTPUT);
pinMode(led8, OUTPUT);
pinMode(led9, OUTPUT);
pinMode(led10, OUTPUT);
pinMode(led11, OUTPUT);
pinMode(led12, OUTPUT);
pinMode(led14, OUTPUT);
pinMode(led15, OUTPUT);
pinMode(led16, OUTPUT);
pinMode(led17, OUTPUT);
pinMode(led18, OUTPUT);
pinMode(led19, OUTPUT);
pinMode(led20, OUTPUT);
pinMode(led21, OUTPUT);
pinMode(led22, OUTPUT);
pinMode(led23, OUTPUT);
pinMode(led24, OUTPUT);
pinMode(led25, OUTPUT);
pinMode(led26, OUTPUT);
pinMode(led27, OUTPUT);
pinMode(led28, OUTPUT);
pinMode(led29, OUTPUT);
pinMode(led30, OUTPUT);
pinMode(led31, OUTPUT);
pinMode(led32, OUTPUT);
pinMode(led33, OUTPUT);
pinMode(led34, OUTPUT);
pinMode(led35, OUTPUT);
pinMode(led36, OUTPUT);
pinMode(led37, OUTPUT);
pinMode(led38, OUTPUT);
pinMode(led39, OUTPUT);
pinMode(led40, OUTPUT);
pinMode(led41, OUTPUT);
pinMode(led42, OUTPUT);
pinMode(led43, OUTPUT);
pinMode(led44, OUTPUT);
pinMode(led45, OUTPUT);
pinMode(led46, OUTPUT);
pinMode(led47, OUTPUT);
pinMode(led48, OUTPUT);
pinMode(led49, OUTPUT);
pinMode(led50, OUTPUT);
pinMode(led51, OUTPUT);
pinMode(led53, OUTPUT);
pinMode(led53, OUTPUT);

}

// the loop routine runs over and over again forever:
void loop() {
digitalWrite(led, HIGH); // turn the LED on (HIGH is the voltage level)
delay(100); // wait for a second
{digitalWrite(led2, HIGH);
delay(100);
digitalWrite(led2, LOW);
delay(100);}
{digitalWrite(led3, HIGH);
delay(100);
digitalWrite(led3, LOW);
delay(100);}// wait for a second
{digitalWrite(led4, HIGH);
delay(100);
digitalWrite(led4, LOW);
delay(100);}// wait for a second
{digitalWrite(led5, HIGH);
delay(100);
digitalWrite(led5, LOW);
delay(100);}// wait for a second
{digitalWrite(led6, HIGH);
delay(100);
digitalWrite(led6, LOW);
delay(100);}// wait for a second
{digitalWrite(led7, HIGH);
delay(100);
digitalWrite(led7, LOW);
delay(100);}// wait for a second
{digitalWrite(led8, HIGH);
delay(100);
digitalWrite(led8, LOW);
delay(100);}// wait for a second
{digitalWrite(led9, HIGH);
delay(100);
digitalWrite(led9, LOW);
delay(100);}// wait for a second
{digitalWrite(led10, HIGH);
delay(100);
digitalWrite(led10, LOW);
delay(100);}// wait for a second
{digitalWrite(led11, HIGH);
delay(100);
digitalWrite(led11, LOW);
delay(100);}// wait for a second
{digitalWrite(led, HIGH);
delay(100);
digitalWrite(led, LOW);
delay(100);}// wait for a second
{digitalWrite(led12, HIGH);
delay(100);
digitalWrite(led12, LOW);
delay(100);}// wait for a second
{digitalWrite(led14, HIGH);
delay(100);
digitalWrite(led14, LOW);
delay(100);}// wait for a second
{digitalWrite(led15, HIGH);
delay(100);
digitalWrite(led15, LOW);
delay(100);}// wait for a second
{digitalWrite(led16, HIGH);
delay(100);
digitalWrite(led16, LOW);
delay(100);}// wait for a second
{digitalWrite(led17, HIGH);
delay(100);
digitalWrite(led17, LOW);
delay(100);}// wait for a second
{digitalWrite(led18, HIGH);
delay(100);
digitalWrite(led18, LOW);
delay(100);}// wait for a second
{digitalWrite(led19, HIGH);
delay(100);
digitalWrite(led19, LOW);
delay(100);}// wait for a second
{digitalWrite(led20, HIGH);
delay(100);
digitalWrite(led20, LOW);
delay(100);}// wait for a second
{digitalWrite(led21, HIGH);
delay(100);
digitalWrite(led21, LOW);
delay(100);}// wait for a second
{digitalWrite(led22, HIGH);
delay(100);
digitalWrite(led22, LOW);
delay(100);}// wait for a second
}

8

Then I only can say I thing, array's.

10

I did what you suggested and pin 22 is HIGH.

12

Below is the code I am using to test pin 22. When running pin 22 is High and pin 24 is toggling. I do not understand what is going on. I need help.

int led = 13;
int led22 = 22;

void setup() {
// initialize the digital pin as an output.
pinMode(led, OUTPUT);
pinMode(led22, OUTPUT);

}

void loop() {
digitalWrite(led, HIGH); // turn the LED on (HIGH is the voltage level)
delay(100); // wait for a 10th of a second
digitalWrite(led, LOW);
delay(100); // wait for a 10th of a second
digitalWrite(led22, HIGH);
delay(100); // wait for a 10th of a second
digitalWrite(led22, LOW);
delay(100); // wait for a 10th of a second
}

14

I am sorry I don't understand all the forum rules. To answer how it hooked up. I am using a Logic Probe to see the state of pin and it works.

16

Just move your connection down one, those top 2 terminals are 5V

17

Thank you for that oops I was off by one pin. It is working. Went back to one of my earlier programs and stared over and slowly I got it to work. I think I went off on the wrong track. Thank you everyone for all your help.