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I'm trying to use the popular SN74HC595 Shift Register, but I think something isn't right because when the bits are submitted to the register it comes out with something similar but not the same.

#define Latch 9
#define CLK 10
#define DATA 8

byte led = B10110111;

void setup() 
{
  pinMode(Latch, OUTPUT);
  pinMode(CLK, OUTPUT);
  pinMode(DATA, OUTPUT);

  digitalWrite(Latch, LOW);
  shiftOut(DATA, CLK, MSBFIRST, led);
  digitalWrite(Latch, HIGH);
}

void loop() 
{
  //LOOP
}

After this completes I receive an output of 10110101 instead of 10110111. Has anybody had the same area? Any fixes? Could my chip be faulty inside?

Schematic: Schematic

7
  • is a specific bit failing?
    – jsotola
    Commented Jul 10, 2019 at 4:29
  • I guess you have just forgotten to draw the gnd and 5V lines to the breadboard?
    – Wirewrap
    Commented Jul 10, 2019 at 5:35
  • 1
    Lack of decoupling capacitors?
    – Majenko
    Commented Jul 10, 2019 at 5:57
  • @jsotola It can be any bit that fails but usually within the last 3 Commented Jul 10, 2019 at 13:51
  • @Wirewrap Yes I forgot to draw the GND, and 5V to the breadboard, but they are connected Commented Jul 10, 2019 at 13:52

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