Unable to read write to array

[Bobsbees]

I am trying to learn how to read/write to an array. The onboard led should change its blink rate when I either ground pin 2, or connect to +5v. Unfortunately, the led remains off. Any suggestions how to fix the code will be appreciated. I have been working on it a few days now without success.

const int ledPin = 13; // onboard LED const int hallPin = 2;

byte test[3][8] {{0, 0, 0, 0, 0, 0, 1, 1}, {0, 0, 1, 0, 0, 0, 0, 0}, {1, 1, 1, 1, 1, 1, 1, 1}};

void setup()
{
pinMode(ledPin,OUTPUT);
pinMode(hallPin,INPUT);
}

void loop()
{

if (hallPin == HIGH)
{

test[2][2] = 1;
digitalWrite(ledPin, test[2][2]);
delay(200);

test[2][2] = 0;
digitalWrite(ledPin, test[2][2]);
delay(200);
}

else if (hallPin == LOW)
{
test[2][2] = 0;
digitalWrite(ledPin, test[2][2]);
delay(100);

test[2][2] = 1;
digitalWrite(ledPin, test[2][2]);
delay(500);
}
}


[Danois90]

For starters, you must read the state of the hall pin:

...
if (digitalRead(hallPin) == HIGH)
{
 //High
}
else
{
 //Low
}
...

[johnwasser]

@Bobsbees

const int hallPin = 2;

'hallPin' is 2 so it is never going to be == HIGH (== 1) or == LOW (== 0). As shown above, you need 'digitalRead(hallPin)' to read the input pin.

[alto777]

@Bobsbees

digitalWrite(ledPin, test[2][2]);

When you just playing with arrays and indexing to see what's what and what's where, it will make your experiments more revealing if you use different numbers, so ledPin[2][3] for example.

a7

[Bobsbees]

Thanks. Much appreciated.