InloveTech

(for basic information on Shift Register, head over to Technopedia section)

Things needed:-

1) Arduino(any model will do)

2) 16 x LEDs

3) 2 x 74HC595N Shift register

Pin arrangement of the shift register is given in the following diagram:-

Connections:

Connect the circuit as per the schematic given below

Code:-

For Binary Counting:

int dataPin = 2; //Define which pins will be used for the Shift Register control

int latchPin = 3;

int clockPin = 4;

int byte1 = 0; //The counter for storing the byte #1 value

int byte2 = 0; //The counter for storing the byte #2 value

void setup()

{

pinMode(dataPin, OUTPUT); //Configure each IO Pin

pinMode(latchPin, OUTPUT);

pinMode(clockPin, OUTPUT);

}

void loop()

{

for (byte2 = 0; byte2 < 256; byte2++) //Outer Loop

{

for (byte1 = 0; byte1 < 256; byte1++) //Inner Loop

{

digitalWrite(latchPin, LOW); //Pull latch LOW to start sending data

shiftOut(dataPin, clockPin, MSBFIRST, byte1); //Send the data byte 1

shiftOut(dataPin, clockPin, MSBFIRST, byte2); //Send the data byte 2

digitalWrite(latchPin, HIGH); //Pull latch HIGH to stop sending data

delay(250);

}

For LED rider:

int dataPin = 2; //Define which pins will be used for the Shift Register control

int latchPin = 3;

int clockPin = 4;

int seq1[14] = {1,2,4,8,16,32,64,128,64,32,16,8,4,2}; //The array for storing the

// byte #1 value

int seq2[14] = {128,64,32,16,8,4,2,1,2,4,8,16,32,64}; //The array for storing the

// byte #2 value

void setup()

{

pinMode(dataPin, OUTPUT); //Configure each IO Pin

pinMode(latchPin, OUTPUT);

pinMode(clockPin, OUTPUT);

}

void loop()

{

for (int x = 0; x < 14; x++) //Array Index

{

digitalWrite(latchPin, LOW); //Pull latch LOW to start sending data

shiftOut(dataPin, clockPin, MSBFIRST, seq1[x]); //Send the data byte 1

shiftOut(dataPin, clockPin, MSBFIRST, seq2[x]); //Send the data byte 2

digitalWrite(latchPin, HIGH); //Pull latch HIGH to stop sending data

delay(75);

}

YOU MAY EXPERIMENT WITH 4 SHIFT REGISTERS too and so on...

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