Electronic Kits -> LED Kits -> 4 digit 7-segment

4 Digit 7-segment 74HC595 board

February 24th 2016

The main part of the kit is the two 74HC595 shift registers which drive a single 4 digit 7-segment display (with red LEDs).
This board can be driven by a large number of devices including Arduino (any), PICAXE (the X1 and X2 parts have fast clock speeds and a fast shiftout function, and those parts without the fast shiftout function that can run at 32MHz (8MHz is fast enough for 2 digit display)) and the Raspberry Pi.
The colon on the display can be driven via the "Control" header connection - ideal if you plan on having a realtime-clock (such as a Dallas DS1307) drive it from its 1Hz square wave output.
The three unused shift register outputs are available via the boards "External" connector.
Usage Suggestions
Use this board as a counter, timer, clock, temperature display (example code included) and many other exciting projects. Start with the example code and make exciting things!
Latest build instructions here (PDF).
  Example code for Arduino and PICAXE microcontrollers.    
  Several examples that you can use as the basis for bigger and better projects.    


  • Fun to build and a useful add-on
  • Looks great
  • 4 digit 7-segment display
  • 2x 74HC595 shift registers
  • Direct connection to the colon LEDs
  • Diode to prevent against reverse power supply connection
  • Control from Arduino, PICAXE (X1/ X2/M2 parts recommended) or Raspberry Pi
  • Lots of example programs to play with once it's built

Kit Contents

  • Printed circuit board (PCB)
  • 4 digit 7-segment display, common-anode red LEDs (datasheet)
  • 9x 330 ohm resistors
  • 2x 74HC595 shift register ICs (datasheet)
  • 1x 1N4001 diode
  • 2x 16 pin DIL sockets (for the shift register ICs)
  • 1x 6 pin header, for power and control connection





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