Arduino sketch for lap time measurements using external gates as triggers. Timestamps are sent on the serial port (UART), on the format mmssuu, where mm=minutes, ss=seconds and uu=hundreds of seconds ...

Now that we have our items, we can take the LCD Keypad and connect it to the pins on the UNO Board. (Make sure to line them up and press down) Connect your Standard USB Cable to the Arduino UNO Board ...