The 7 Segment 4 Digit Display With 2x 74HC595 is an integrated module featuring four 7-segment digits controlled by two 74HC595 shift register ICs. Each digit is equipped with a 7-segment LED display with a height of 12.7mm, illuminated in bright red, including a dot LED. This module is purpose-built for use with microcontrollers, such as Arduino, providing a straightforward interface. With minimal wiring requirements—just three data wires similar to any single 74HC595—and two power cables, this module simplifies the integration process. Operating on a driving voltage of 5.

 

Features

• The 74HC595 functions as a shift register employing the Serial IN Parallel OUT protocol.
• It receives data serially from the microcontroller and then transmits this data through parallel pins.
• Typically, a single chip expands the outputs by 8.
• Multiple 74HC595 ICs can be connected in parallel, allowing for even further expansion.
• In this module, two Shift register ICs are interconnected, enhancing the versatility of the output configuration.

 

 

Specifications:

• Working Voltage:3.3V-5V
• Size:42*24*12mm
• Digital Display Color:Red

 

Connections:

Module Pin	Arduino Pin
VCC	5V Pin
GND	GND
SDI	Pin 2
CLK	Pin 3
LOAD	Pin 4

 

there is a need to download the 74HC595 Library:

Click here and then Add it to the Arduino IDE

 

#include "ShiftRegister74HC595.h"

// create a global shift register object
// parameters:  (data pin, clock pin, latch pin)
ShiftRegister74HC595<1> sr(2, 3, 4);
 
void setup() { 
}

void loop() {

  // setting all pins at the same time to either HIGH or LOW
  sr.setAllHigh(); // set all pins HIGH
  delay(500);
  
  sr.setAllLow(); // set all pins LOW
  delay(500); 
  

  // setting single pins
  for (int i = 0; i < 8; i++) {
    
    sr.set(i, HIGH); // set single pin HIGH
    delay(250); 
  }
  
  
  // set all pins at once
  uint8_t pinValues[] = { B10101010 }; 
  sr.setAll(pinValues); 
  delay(1000);

  
  // read pin (zero based, i.e. 6th pin)
  uint8_t stateOfPin5 = sr.get(5);
  sr.set(6, stateOfPin5);


  // set pins without immediate update
  sr.setNoUpdate(0, HIGH);
  sr.setNoUpdate(1, LOW);
  // at this point of time, pin 0 and 1 did not change yet
  sr.updateRegisters(); // update the pins to the set values
}