How to interface IC 74HC595D with an Arduino?

Hey there, fellow electronics enthusiasts! I'm an IC 74HC595D supplier, and today I'm super excited to walk you through how to interface the IC 74HC595D with an Arduino. This is a pretty cool setup that can expand your Arduino's capabilities, so let's dive right in!

What's the IC 74HC595D?

First off, let's get to know the IC 74HC595D. It's a serial-in, parallel-out shift register. In simpler terms, it allows you to control multiple output pins using just a few input pins on your Arduino. This is super handy when you're running out of pins on your Arduino but still want to control a bunch of LEDs, servos, or other devices.

The 74HC595D has eight output pins (Q0 - Q7), and it can be daisy-chained to control even more outputs. It communicates with the Arduino using a serial protocol, which means data is sent one bit at a time.

Why Interface it with an Arduino?

Arduino is a great platform for all kinds of electronics projects, but it has a limited number of digital output pins. For example, the Arduino Uno has only 14 digital output pins. If you want to control, say, 20 LEDs, you'll quickly run out of pins. That's where the 74HC595D comes in. By using this shift register, you can control up to 8 additional outputs with just 3 Arduino pins. And if you daisy-chain multiple 74HC595Ds, you can control even more!

Parts You'll Need

• An Arduino board (I'll be using an Arduino Uno in this example, but any Arduino should work).
• An IC 74HC595D shift register.
• A breadboard.
• Jumper wires.
• Some LEDs and resistors (optional, for testing).

Wiring the 74HC595D to the Arduino

Let's start with the wiring. The 74HC595D has 16 pins, and we'll be connecting it to the Arduino using just 3 data pins and a few power and ground connections.

• VCC (Pin 16): Connect this to the 5V pin on the Arduino. This provides power to the shift register.
• GND (Pin 8): Connect this to the ground pin on the Arduino.
• SER (Pin 14): This is the serial data input pin. Connect it to a digital output pin on the Arduino (I'll use pin 11).
• SRCLK (Pin 11): This is the shift register clock pin. Connect it to another digital output pin on the Arduino (I'll use pin 12).
• RCLK (Pin 12): This is the storage register clock pin. Connect it to a third digital output pin on the Arduino (I'll use pin 8).
• OE (Pin 13): This is the output enable pin. You can connect it to ground to enable the outputs all the time. If you want to control when the outputs are enabled, you can connect it to a digital output pin on the Arduino.
• MR (Pin 10): This is the master reset pin. Connect it to 5V to keep the shift register in a normal operating mode.

If you're using LEDs to test the setup, connect the positive leg of each LED to one of the output pins (Q0 - Q7) on the 74HC595D through a resistor (around 220 - 330 ohms), and connect the negative leg to ground.

Writing the Arduino Code

Now that the hardware is all set up, let's write the code to control the 74HC595D. Here's a simple example that will blink the LEDs connected to the output pins of the shift register:

// Define the pins connected to the 74HC595D
const int dataPin = 11;
const int clockPin = 12;
const int latchPin = 8;

void setup() {
  // Set the pins as outputs
  pinMode(dataPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(latchPin, OUTPUT);
}

void loop() {
  // Turn on all the LEDs
  shiftOut(dataPin, clockPin, MSBFIRST, 255);
  digitalWrite(latchPin, HIGH);
  digitalWrite(latchPin, LOW);
  delay(1000);

  // Turn off all the LEDs
  shiftOut(dataPin, clockPin, MSBFIRST, 0);
  digitalWrite(latchPin, HIGH);
  digitalWrite(latchPin, LOW);
  delay(1000);
}

Let's break down the code:

• In the setup() function, we set the data, clock, and latch pins as outputs.
• In the loop() function, we use the shiftOut() function to send data to the shift register. The first argument is the data pin, the second is the clock pin, the third is the bit order (MSBFIRST means most significant bit first), and the fourth is the data to send (255 in binary is 11111111, which turns on all the LEDs, and 0 turns them all off).
• We then set the latch pin high and then low to transfer the data from the shift register to the storage register, which actually controls the output pins.
• Finally, we add a delay of 1 second between turning the LEDs on and off.

Daisy-Chaining Multiple 74HC595Ds

If you want to control more than 8 outputs, you can daisy-chain multiple 74HC595Ds. To do this, connect the Q7' (Pin 9) of the first shift register to the SER (Pin 14) of the second shift register. You'll also need to adjust the code to send data to both shift registers.

Here's an example code for controlling two daisy-chained 74HC595Ds:

// Define the pins connected to the 74HC595D
const int dataPin = 11;
const int clockPin = 12;
const int latchPin = 8;

void setup() {
  // Set the pins as outputs
  pinMode(dataPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(latchPin, OUTPUT);
}

void loop() {
  // Turn on all the LEDs on both shift registers
  shiftOut(dataPin, clockPin, MSBFIRST, 255);
  shiftOut(dataPin, clockPin, MSBFIRST, 255);
  digitalWrite(latchPin, HIGH);
  digitalWrite(latchPin, LOW);
  delay(1000);

  // Turn off all the LEDs on both shift registers
  shiftOut(dataPin, clockPin, MSBFIRST, 0);
  shiftOut(dataPin, clockPin, MSBFIRST, 0);
  digitalWrite(latchPin, HIGH);
  digitalWrite(latchPin, LOW);
  delay(1000);
}

Other ICs You Might Be Interested In

As an IC supplier, I also offer other interesting ICs that you might find useful for your projects. For example, the TAS5707PHPR is a great audio IC that can be used for high-quality audio amplification. The LM324DR is a quad operational amplifier that can be used in a variety of audio and other electronic circuits. And if you're looking for a Volume Control IC, we've got you covered too.

Wrapping Up and Contacting Us

So there you have it! That's how you interface the IC 74HC595D with an Arduino. It's a great way to expand your Arduino's capabilities and control more devices with fewer pins.

If you're interested in purchasing the IC 74HC595D or any of the other ICs I mentioned, feel free to reach out for a purchase and negotiation. We're always happy to help you find the right components for your projects.

References

• Arduino official documentation.
• 74HC595D datasheet.