74HC165 Shift-in Test code

note: I used same arduino pin numbers as bitbutter. so if you have standard type(ex:philips,..)IC, you refer bitbutter's

schematic and connect pins with my table as followed. Both my code and his will work correctly.

bitbutter's URL: http://basementleds.blogspot.com/2008/06/shift-register-ins-and-outs.html

74HC165 8-bit Parallel-in/Serial-out Shift Registor

165 pin Number	Desc.	Connect to :
1	parallel/serial control (LATCH)PL	<- Arduino Ouput 13
2	CLOCK	<-- Arduino Output 12
3	D4
4	D5
5	D6
6	D7
7	complemantary Output	<- N.C. (ignore)
8	GND	<- GND
9	serial data Output (Q7)	àArduino Input 11
10	serial data input (Ds)	-> 165_#2 serial data Output(use in daisy-chain)
11	D0
12	D1
13	D2
14	D3
15	CLOCK enable input (active”low”)	<- GND
16	Vcc	ß--- 5V

* Fig1,2 from 74hc165 datasheet

Here is my(?) code:

http://kyun.hosting.paran.com/source/_165_test.pde

//**************************************************************//
// Modified by Raynor for using 74HC165 test,2008 //
/// Previously written for CD4021B Shift Register by

// Carlyn Maw,2007 //
//****************************************************************

//define where your pins are
int latchPin = 13;
int dataPin = 11;
int clockPin = 12;

//Define variables to hold the data
//for each shift register.
//starting with non-zero numbers can help
//troubleshoot
byte switchVar1 = 72; //01001000
byte switchVar2 = 1; //00000001

void setup() {
//start serial
Serial.begin(9600);

//define pin modes
pinMode(latchPin, OUTPUT);
pinMode(clockPin, OUTPUT);
pinMode(dataPin, INPUT);

}

void loop() {

//Pulse the latch pin:
//set it to 0 to collect parallel data
digitalWrite(latchPin,0);
//set it to 0 to collect parallel data, wait
delayMicroseconds(20);
//set it to 1 to transmit data serially
digitalWrite(latchPin,1);

//while the shift register is in serial mode
//collect each shift register into a byte
//the register attached to the chip comes in first
switchVar1 = shiftIn(dataPin, clockPin);
delay (1);
switchVar2 = shiftIn(dataPin, clockPin);
//white space
Serial.println("-");
//delay so all these print satements can keep up.
delay(1000);

}

//------------------------------------------------end main loop

////// ----------------------------------------shiftIn function

byte shiftIn(int myDataPin, int myClockPin) {
int i;
int temp = 0;
int pinState;
byte myDataIn = 0x00;

pinMode(myClockPin, OUTPUT);
pinMode(myDataPin, INPUT);

//we will be holding the clock pin high 8 times (0,..,7) at the
//end of each time through the for loop

//at the begining of each loop when we set the clock low, it will
//be doing the necessary low to high drop to cause the shift
//register's DataPin to change state based on the value
//of the next bit in its serial information flow.
//The register transmits the information about the pins from pin 7 to pin 0
//so that is why our function counts down
for (i=7; i>=0; i--)
{
digitalWrite(myClockPin, 0);
delayMicroseconds(2);
temp = digitalRead(myDataPin);
if (boolean(temp) == true) {
pinState = 1;
//set the bit to 0 no matter what
myDataIn = myDataIn (0x01 << pinstate =" 0;">

Test 74HC165 SHIFT REGISTOR WITH 16 button in daisychain