Скачать или смотреть Making a LEGO Stopwatch as Precise as My Phone

Where I ended off the previous video, I had built a highly compact LEGO 4-digit counter. In this video I wanted to see if I could use it to build a LEGO stopwatch as precise as the stopwatch on my phone. The first challenge was making the LEGO 7-segment displays count fast enough to match the fastest digit on the phone screen. After several iterations, and a few redesigns, I managed to make the displays count fast enough. The next challenge was to make the LEGO stopwatch as accurate as my phone, so that it would count up by 1 second in a time of exactly 1 second. I did this by making a control system for the motor powering the stopwatch, and I did some basic tuning to make it more stable. Altogether, I was able to finish the video with a stopwatch as accurate and precise as I was hoping for. Enjoy the video!

Timestamps:
0:00 The 4-digit Lego counter
2:33 Problems at higher counting speeds
7:12 Making the displays count fast enough
12:30 Control system for accuracy
17:31 Control system trial and improvement
20:41 Finished and working