Stopwatch Using 4 Digit 7 Segment Display & Arduino In this project we have designed Simple Stopwatch Using 4 Digit 7 Segment Display & Arduino with Start, Stop & Reset Button. A stopwatch will always have 2 buttons or modes, a start, and a stop mode. It may have other features but it will always have these.
![]() Control 7-Segment Display with 74HC595 Shift Register
This example shows how to use the MATLAB® Support Package for Arduino® Hardware to control a 1-Digit 7-Segment display with a 74HC595 8-bit serial-in-parallel-out shift register.
Hardware Requirements
Hardware Setup
Connect the 7-Segment display and 74HC595 shift register to Arduino hardware:
Create Shift Register Object
Create an arduino object, and include the ShiftRegister library.
Create shift register object for the display module, specifying the connected data pin, clock pin, and latch pin.
Display Numbers
Each segment of the 7-segment display is controlled by a pin corresponding to the segment, including pin A-G and pin DP. Common anode 7-segment display means the segment pin needs to be low to turn it on. Here is the mapping between the segments and the pins, including shift register outputs.
Create a table of binary equivalents for all single digit numbers.
To display a number on the module, write the corresponding binary number to the shift register, which will get reflected on its outputs, therefore controlling the on and off of the segments. Here is the code to loop through the ten digits on the display,
Clean Up
When the connection is no longer needed, clear the shift register and arduino object.
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