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70. Arduino Stopwatch and Timer

Hello everyone!

Today I am going to explain you about making an Arduino Stopwatch and Timer, which can be used for time based projects. Read on further to learn more about this project.

Hardware components used in this project

  • Arduino Uno
  • USB Type A/ B cable
  • Solderless Breadboard - Full+
  • LCD display module with I2C interface - 16x2
  • Potentiometer - 10K
  • Push-buttons (x5)
  • Active Buzzer module (KY-012)
  • LED - Red
  • Resistors (x6) - 10kΩ (x5) and 220Ω (x1)
  • Male-to-Male Jumper wires - 10cm and 20cm
  • Jumpers - to reduce the usage of wires

Hardware setup





Connections

10K Potentiometer

  • S - A0
  • (+) - 5V
  • (-) - Ground (GND)

Active Buzzer module

  • S - D7
  • (+) - 5V
  • (-) - Ground (GND)

16x2 LCD display module with I2C interface

  • GND - Ground
  • VCC - 5V
  • SDA - A4
  • SCL - A5

Push-buttons

  • (+) - 5V
  • (-) - Ground (GND)
  • S - D2, D3, D4, D5, D6

Coding

Now, I will explain you about how this real-time project works and you can figure out the coding by this idea. 

Push-buttons and their functions

  • D2 - Set Countdown timer
  • D3 - Start Countdown timer
  • D4 - Start stopwatch. Second press will reset the stopwatch
  • D5 - Pause the stopwatch
  • D6 - Toggle between stopwatch and timer modes
You must program the push-buttons to debounce. When the push-button connected to D2 is pressed, the Arduino microcontroller maps the potentiometer reading to seconds (0-60). When you press the push-button connected to D3, the counts decrease by 1 and when the count reaches zero, the Red LED and buzzer will have a one second delay while they are turned on and off.

Create a variable to store the value returned by millis( ) function when the push-button connected to D4 gives a LOW signal. While the D5 push-button produces a HIGH signal, another variable must store the value returned by millis( ). The value stored in the first variable must be subtracted from the value stored in the second variable. The result must be divided by 1000 to return the number of seconds that have passed since you started the stopwatch. The Red LED must light up when D5 push-button sends a LOW signal while D4 push-button sends a HIGH signal.

If anyone has questions about the code explanation, please feel free to contact me at arduinoprojectsbyr@gmail.com.

Final Look

If anyone has any doubts or suggestions about this project, please feel free to comment below or send me an email at arduinoprojectsbyr@gmail.com.


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