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To stop the time elapsed just press the same button again. So just press the start button and then the time elapsing starts. Once the code is uploaded to Arduino Board, it will display 000.0. You can even use the Common Cathode type and reverse the Supply and GND. The 4 Digit 7 Segment Display used here is the Common Anode type. Pin D9 is connected to LOAD (CS) of MAX7219 Pin D8 is connected to CLK (CLK) of MAX7219 Pin D7 is connected to DataIn (DIN) of MAX7219

Assemble the circuit as shown in the figure below. You can check this project related to the application of MAX7219 IC: 8×8 LED Matrix MAX7219 with Arduino Circuit & Codeīelow is the circuit diagram for Stopwatch Using 4 Digit 7 Segment Display & Arduino. Go through MAX7219 Datasheets from here: MAX7219 Datasheets MAX7219 also allows the user to select code-B decoding or no-decode for each digit. Individual digits may be addressed and updated without rewriting the entire display.

A convenient 4-wire serial interface connects to all common microprocessors. Only one external resistor is required to set the segment current for all LEDs. Included on-chip are a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers and an 8×8 static RAM that stores each digit. Maxim Integrated MAX7219 / MAX7221 8-Digit LED Display Drivers are compact, serial input/output common-cathode display drivers that interface\microprocessors to 7-segment numeric LED displays of up to 8 digits, to bar-graph displays, or to 64 individual LEDs. MAX7219 / MAX7221 8-Digit LED Display Driver All of these components can be purchased from Amazon S.N. We just need the following components to make Stopwatch/Lap Timer. Stopwatch Using Arduino & LCD with Start, Stop & Reset Button Here is our previous version of the same project: The millis feature of the Arduino Code allows the Arduino to display the functions up to the value in milliseconds to 100% accuracy. The stopwatch can be used to measure up to 999.9 seconds. This can be done with the pressing reset button of Arduino. Additionally, we have added reset function too. It may have other features but it will always have these. A stopwatch will always have 2 buttons or modes, a start, and a stop mode. In this project, we have designed Simple Stopwatch Using 4 Digit 7 Segment Display & Arduino with Start, Stop & Reset Button. Stopwatch Using 4 Digit 7 Segment Display & Arduino MAX7219 / MAX7221 8-Digit LED Display Driver.Stopwatch Using 4 Digit 7 Segment Display & Arduino.