/*

A small test of inputting from a 74HC165 PISO Shift Register.


*/

const int dataPin = 2;   /* Q7 */
const int clockPin = 3;  /* CP */
const int latchPin = 4;  /* PL */
const int cePin = 13; /* CE */

byte incomingBits;
byte prevBits;

 
void setup() {
  Serial.begin(9600);
  pinMode(dataPin, INPUT_PULLUP);
  pinMode(clockPin, OUTPUT);
  pinMode(latchPin, OUTPUT);
  pinMode(cePin, OUTPUT);
  digitalWrite(cePin, LOW);
}
 
void loop() {

digitalWrite(latchPin, LOW);
digitalWrite(latchPin, HIGH);

digitalWrite(clockPin, HIGH);
digitalWrite(cePin, LOW);
byte incomingBits = shiftIn(dataPin, clockPin, LSBFIRST);

digitalWrite(cePin, HIGH);

if(incomingBits != prevBits) {
Serial.println("Bits are: ");
for(int i = 0; i < 8;i++) {
Serial.print(bitRead(incomingBits,i), BIN);
}
Serial.println();
prevBits = incomingBits;
}
delay(10);


}