Project tutorial

I built a project using 8x8 LED matrix without using MAX7219 or any extra library files because they make code difficult to understand.

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• 4 respects

## Components and supplies

 Arduino UNO & Genuino UNO
×1
×1
 Jumper wires (generic)
×34
 Infrared Sensor
×1
 Led Matrix
×1

## Apps and online services

 Arduino IDE

I wanted to make a project using 8x8 LED matrix without the help of MAX7219 and without adding any of the libraries.

So, I created Magic Eyes - a fun project which act as kind of humans. When something comes very close to us, our eyes closes on its on because of stimuli. I have done the same thing with my project.

I wanted it to be different, cheap and playful. If you use Max7219 circuit with it, it will be cost you around {2*(AU \$5.54)}, while if you use only led matrix, it will cost around {2*(AU \$0.8)}. I don't want to add any libraries because from them, we can't understand the code.

## Code

##### Led MatrixArduino
```//Simply connect all the pins as shown in diagram
//You need to connect 220 ohm resistor to save the led matrix.
#define ROW_1 2
#define ROW_2 3
#define ROW_3 4
#define ROW_4 5
#define ROW_5 6
#define ROW_6 7
#define ROW_7 8
#define ROW_8 9

#define COL_1 10
#define COL_2 11
#define COL_3 12
#define COL_4 13
#define COL_5 A0
#define COL_6 A1
#define COL_7 A2
#define COL_8 A3

const byte rows[] = {ROW_1, ROW_2, ROW_3, ROW_4, ROW_5, ROW_6, ROW_7, ROW_8};

//if you want to change the design, put your changes in design line wise
byte OPEN[] =
{
B00111100,                             //    ****
B01000010,                             //   *    *
B10011001,                             //  *  **  *
B10111101,                             //  * **** *
B10111101,                             //  * **** *
B10011001,                             //  *  **  *
B01000010,                             //   *    *
B00111100                              //    ****
};

byte CLOSE[] =
{
B00111100,                             //    ****
B01000010,                             //   *    *
B10000001,                             //  *      *
B10000001,                             //  *      *
B10000001,                             //  *      *
B10000001,                             //  *      *
B01000010,                             //   *    *
B00111100                              //    ****
};

void setup()
{
Serial.begin(9600);
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
pinMode(7, OUTPUT);
pinMode(8, OUTPUT);
pinMode(9, OUTPUT);
pinMode(10, OUTPUT);
pinMode(11, OUTPUT);
pinMode(12, OUTPUT);
pinMode(13, OUTPUT);
pinMode(A0, OUTPUT);
pinMode(A1, OUTPUT);
pinMode(A2, OUTPUT);
pinMode(A3, OUTPUT);

pinMode(A4, INPUT);
}

void loop()
{
{
drawScreen(OPEN);
}
else
{
drawScreen(CLOSE);
}
}

void  drawScreen(byte buffer2[])
{
// Turn on each row in series
for (byte i = 0; i < 8; i++)
{
setColumns(buffer2[i]); // Set columns for this specific row
digitalWrite(rows[i], HIGH);
digitalWrite(rows[i], LOW);
}
}

void setColumns(byte b)
{
digitalWrite(COL_1, (~b >> 0) & 0x01); // Get the 1st bit: 10000000
digitalWrite(COL_2, (~b >> 1) & 0x01); // Get the 2nd bit: 01000000
digitalWrite(COL_3, (~b >> 2) & 0x01); // Get the 3rd bit: 00100000
digitalWrite(COL_4, (~b >> 3) & 0x01); // Get the 4th bit: 00010000
digitalWrite(COL_5, (~b >> 4) & 0x01); // Get the 5th bit: 00001000
digitalWrite(COL_6, (~b >> 5) & 0x01); // Get the 6th bit: 00000100
digitalWrite(COL_7, (~b >> 6) & 0x01); // Get the 7th bit: 00000010
digitalWrite(COL_8, (~b >> 7) & 0x01); // Get the 8th bit: 00000001
// If the polarity of your matrix is the opposite of mine
// remove all the '~' above.
}
```

## Schematics

Simply do the connection as done in the image and put Infrared sensor at PIN A4. Provide Vin and GND to both Infrared sensor and Arduino.

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July 28, 2018

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