Tutorial.ShftOut12 History

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March 25, 2010, at 12:09 AM by Tom Igoe -
Changed line 25 from:

const int clockPin = 11;

to:

const int clockPin = 12;

Changed lines 27-28 from:

const int dataPin = 12;

to:

const int dataPin = 11;

March 25, 2010, at 12:08 AM by Tom Igoe -
Changed line 59 from:
  digitalWrite(latchPin, HIGH);
to:
  digitalWrite(latchPin, LOW);
Changed lines 68-69 from:
  digitalWrite(latchPin, LOW);
to:
  digitalWrite(latchPin, HIGH);
March 25, 2010, at 12:08 AM by Tom Igoe -
Changed line 23 from:

const int latchPin = 4;

to:

const int latchPin = 8;

Changed line 25 from:

const int clockPin = 3;

to:

const int clockPin = 11;

Changed lines 27-28 from:

const int dataPin = 2;

to:

const int dataPin = 12;

March 24, 2010, at 01:42 PM by Tom Igoe -
Added line 3:

[@

Deleted line 48:
March 24, 2010, at 01:41 PM by Tom Igoe -
Changed lines 3-24 from:

[@ //**************************************************************// // Name : shiftOutCode, One By One // // Author : Carlyn Maw, Tom Igoe // // Date : 25 Oct, 2006 // // Version : 1.0 // // Notes : Code for using a 74HC595 Shift Register // // : to count from 0 to 255 // //****************************************************************

//Pin connected to ST_CP of 74HC595 int latchPin = 8; //Pin connected to SH_CP of 74HC595 int clockPin = 12; ////Pin connected to DS of 74HC595 int dataPin = 11;

//holder for infromation you're going to pass to shifting function byte data = 0;

to:

/*

  Shift Register Example
 for 74HC595 shift register

 This sketch turns reads serial input and uses it to set the pins
 of a 74HC595 shift register.

 Hardware:
 * 74HC595 shift register attached to pins 2, 3, and 4 of the Arduino,
 as detailed below.
 * LEDs attached to each of the outputs of the shift register

 Created 22 May 2009
 Created 23 Mar 2010
 by Tom Igoe

 */

//Pin connected to latch pin (ST_CP) of 74HC595 const int latchPin = 4; //Pin connected to clock pin (SH_CP) of 74HC595 const int clockPin = 3; ////Pin connected to Data in (DS) of 74HC595 const int dataPin = 2;

Added line 31:
  pinMode(dataPin, OUTPUT);  
Changed lines 33-34 from:
  pinMode(dataPin, OUTPUT);
to:
  Serial.begin(9600);
  Serial.println("reset");
Changed lines 38-46 from:
  //function that blinks all the LEDs
  //gets passed the number of blinks and the pause time
  blinkAll(1,500); 

 // light each pin one by one using a function A
  for (int j = 0; j < 8; j++) {
    lightShiftPinA(j);
    delay(1000);
to:
  if (Serial.available() > 0) {
    // ASCII '0' through '9' characters are
    // represented by the values 48 through 57.
    // so if the user types a number from 0 through 9 in ASCII, 
    // you can subtract 48 to get the actual value:
    int bitToSet = Serial.read() - 48;

  // write to the shift register with the correct bit set high:
    registerWrite(bitToSet, HIGH);
Deleted lines 48-55:
  blinkAll(2,500);  

 // light each pin one by one using a function A
  for (int j = 0; j < 8; j++) {
    lightShiftPinB(j);
    delay(1000);
  } 
Changed lines 51-66 from:

//This function uses bitwise math to move the pins up void lightShiftPinA(int p) {

  //defines a local variable
  int pin;

  //this is line uses a bitwise operator
  //shifting a bit left using << is the same
  //as multiplying the decimal number by two. 
  pin = 1<< p;

  //ground latchPin and hold low for as long as you are transmitting
  digitalWrite(latchPin, LOW);
  //move 'em out
  shiftOut(dataPin, clockPin, MSBFIRST, pin);   
  //return the latch pin high to signal chip that it 
  //no longer needs to listen for information
to:

// This method sends bits to the shift register:

void registerWrite(int whichPin, int whichState) { // the bits you want to send

  byte bitsToSend = 0;

  // turn off the output so the pins don't light up
  // while you're shifting bits:
Changed lines 60-69 from:
to:
  // turn on the next highest bit in bitsToSend:
  bitWrite(bitsToSend, whichPin, whichState);

  // shift the bits out:
  shiftOut(dataPin, clockPin, MSBFIRST, bitsToSend);

    // turn on the output so the LEDs can light up:
  digitalWrite(latchPin, LOW);
Deleted lines 70-116:

//This function uses that fact that each bit in a byte //is 2 times greater than the one before it to //shift the bits higher void lightShiftPinB(int p) {

  //defines a local variable
  int pin;

  //start with the pin = 1 so that if 0 is passed to this
  //function pin 0 will light. 
  pin = 1;

  for (int x = 0; x < p; x++) {
    pin = pin * 2; 
  }

  //ground latchPin and hold low for as long as you are transmitting
  digitalWrite(latchPin, LOW);
  //move 'em out
  shiftOut(dataPin, clockPin, MSBFIRST, pin);   
  //return the latch pin high to signal chip that it 
  //no longer needs to listen for information
  digitalWrite(latchPin, HIGH);

}

//blinks the whole register based on the number of times you want to //blink "n" and the pause between them "d" //starts with a moment of darkness to make sure the first blink //has its full visual effect. void blinkAll(int n, int d) {

  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, MSBFIRST, 0);
  digitalWrite(latchPin, HIGH);
  delay(200);
  for (int x = 0; x < n; x++) {
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, MSBFIRST, 255);
    digitalWrite(latchPin, HIGH);
    delay(d);
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, MSBFIRST, 0);
    digitalWrite(latchPin, HIGH);
    delay(d);
  }

}

June 21, 2009, at 11:13 AM by David A. Mellis -
Changed lines 28-30 from:
to:
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
Changed line 66 from:
  digitalWrite(latchPin, 0);
to:
  digitalWrite(latchPin, LOW);
Changed line 68 from:
  shiftOut(dataPin, clockPin, pin);   
to:
  shiftOut(dataPin, clockPin, MSBFIRST, pin);   
Changed lines 71-72 from:
  digitalWrite(latchPin, 1);
to:
  digitalWrite(latchPin, HIGH);
Changed line 81 from:
to:
Changed line 91 from:
  digitalWrite(latchPin, 0);
to:
  digitalWrite(latchPin, LOW);
Changed line 93 from:
  shiftOut(dataPin, clockPin, pin);   
to:
  shiftOut(dataPin, clockPin, MSBFIRST, pin);   
Changed lines 96-97 from:
  digitalWrite(latchPin, 1);
to:
  digitalWrite(latchPin, HIGH);
Deleted lines 100-147:
Changed lines 106-108 from:
  digitalWrite(latchPin, 0);
  shiftOut(dataPin, clockPin, 0);
  digitalWrite(latchPin, 1);
to:
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, MSBFIRST, 0);
  digitalWrite(latchPin, HIGH);
Changed lines 111-113 from:
    digitalWrite(latchPin, 0);
    shiftOut(dataPin, clockPin, 255);
    digitalWrite(latchPin, 1);
to:
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, MSBFIRST, 255);
    digitalWrite(latchPin, HIGH);
Changed lines 115-117 from:
    digitalWrite(latchPin, 0);
    shiftOut(dataPin, clockPin, 0);
    digitalWrite(latchPin, 1);
to:
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, MSBFIRST, 0);
    digitalWrite(latchPin, HIGH);
Deleted line 120:
November 02, 2006, at 01:33 AM by Carlyn Maw -
Added lines 1-2:
November 02, 2006, at 01:32 AM by Carlyn Maw -
Added lines 1-166:

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