Tag Archives: 74HC595

72 Channels Serial To Parallel Driver Board Using 74HC595 & ULN2803

72 channels Serial (SPI) to parallel driver board has been designed for various applications. This project can be used as multi Solenoid driver, large size 7 segment display driver, bar graph driver, and LED driver. The project works with 5V logic levels. Output load supply 12V-48V DC and each output can drive 500mA load.

I have used 3 digits 2.3Inch 7 segment displays as an example, this board can handle up to 9 digits. The board can serve many applications like, Stop Watch, digital timer, counter, score board, token display and lot more.

Project built around 74HC595 and ULN2803 ICs, The 74HC595 devices contain an 8-bit serial-in, parallel-out shift register that feeds an 8-bit D-type storage register. The storage register has parallel 3-state outputs. Separate clocks are provided for both the shift and storage register.

72 Channels Serial To Parallel Driver Board Using 74HC595 & ULN2803 – [Link]

20 Segment Jumbo Size SPI BarGraph Display

Jumbo 20 Segment SPI (Serial) bar graph driver using 74HC595 serial to parallel converter IC and BC635 display driver transistor. This project is useful for application like Amusement machines, arcade gaming, voltage display, current display, pressure sensor display, temperature sensor display , process control equipment, battery condition monitor and many more. Each segment of display consist 10 LED Bargraph display. It is easy to view from long distance, and easy to control by Micro-Controller.

20 Segment Jumbo Size SPI BarGraph Display – [Link]

7 Segment LED Based SPI Display using 74HC595


Single Digit Big Display module using 74HC595 IC project will display large size 7 segment single digit number. 3.5inch height, which can be visible over large distance.  More digit can be connected serially to each other easily connector.

This circuit is a single digit seven segment big display using a set of 5 LEDs per segment and a shift register for easy control by micro-controller input. Each of the LEDs used in this project are 5mm high glow type.


  • A ULN2003 IC helps sink higher current flowing through the LEDs to ground.
  • Resistor R1 to R8 are current limiting Resistors for the LEDs connected in series.
  • CN1 Connector is Data In connector
  • CN2 Connector is optional Data Out Connector if you need to stack more than 1 single display board in series
  • +V CN1 & CN2 should be connected to higher voltage to drive the LEDs
  • VCC Should be connected to 5V DC. This supply can be source from host controller
  • Each Segment made up of 5LEDs

7 Segment LED Based SPI Display using 74HC595 – [Link]

DIY Apple Clock


by TSJWang @ instructables.com:

OK so there’s no such thing as the Apple Clock.
However, you can make your own retro-style bubble display clock in an Apple earbuds case.

I’m going to show you how to do that just sit tight.

DIY Apple Clock – [Link]