Yes, I am getting the zero that I wanted now. I see your point though, essentially its still the same no? and I thought for a moment there, I knew what I was doing!!!!! However, I was getting the zero before but only when the sketch uploaded and when the pot was at one extreme. As soon as I swept the pot up and down, "1" was the minimum that I could get! So the small change I made appeared to have solved this. After that, I took out other parts of the code that didn't appear to be needed and ended up with this...
//**************************************************************//
// Name : shiftOutCode, Predefined Array Style //
// 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;
int j;
//holders for infromation you're going to pass to shifting function
byte data;
byte dataArray[10];
void setup() {
//set pins to output because they are addressed in the main loop
pinMode(latchPin, OUTPUT);
Serial.begin(9600);
dataArray[0] = 0x3F; // 0
dataArray[1] = 0x06; // 1
dataArray[2] = 0x5B; // 2
dataArray[3] = 0x4F; // 3
dataArray[4] = 0x66; // 4
dataArray[5] = 0x6D; // 5
dataArray[6] = 0x7C; // 6
dataArray[7] = 0x07; // 7
dataArray[8] = 0x7F; // 8
dataArray[9] = 0x67; // 9
}
void loop(){
if (j= map(analogRead (0), 0, 1023, 0, 10));
{
data = dataArray[j];
//ground latchPin and hold low for as long as you are transmitting
digitalWrite(latchPin, 0);
//move 'em out
shiftOut(dataPin, clockPin, data);
//return the latch pin high to signal chip that it
//no longer needs to listen for information
digitalWrite(latchPin, 1);
}
}
// the heart of the program
void shiftOut(int myDataPin, int myClockPin, byte myDataOut)
{
// This shifts 8 bits out MSB first,
//on the rising edge of the clock,
//clock idles low
//internal function setup
int pinState;
pinMode(myClockPin, OUTPUT);
pinMode(myDataPin, OUTPUT);
//clear everything out just in case to
//prepare shift register for bit shifting
digitalWrite(myDataPin, 0);
digitalWrite(myClockPin, 0);
//for each bit in the byte myDataOut?
//NOTICE THAT WE ARE COUNTING DOWN in our for loop
//This means that %00000001 or "1" will go through such
//that it will be pin Q0 that lights.
for (j=7; j>=0; j--) {
digitalWrite(myClockPin, 0);
//if the value passed to myDataOut and a bitmask result
// true then... so if we are at i=6 and our value is
// %11010100 it would the code compares it to %01000000
// and proceeds to set pinState to 1.
if ( myDataOut & (1<<j) ) {
pinState= 1;
}
else {
pinState= 0;
}
//Sets the pin to HIGH or LOW depending on pinState
digitalWrite(myDataPin, pinState);
//register shifts bits on upstroke of clock pin
digitalWrite(myClockPin, 1);
//zero the data pin after shift to prevent bleed through
digitalWrite(myDataPin, 0);
}
//stop shifting
digitalWrite(myClockPin, 0);
}