https://www.baldengineer.com/tag/cylonRecent content in cylon on Bald EngineerHugoen-USSun, 03 Apr 2022 00:44:53 +0000https://www.baldengineer.com/proper-larson-scanner-with-sw-pwm.htmlWed, 21 Oct 2015 16:00:03 +0000https://www.baldengineer.com/?p=5501<p>Last week I had a <a href="https://www.baldengineer.com/software-pwm-with-millis.html">detailed Arduino tutorial on software pulse width modulation</a> using millis() and micros(). Why? Because I wanted to create a Proper Larson Scanner, with persistence and at least 8 LEDs.</p> <figure><img src="https://www.baldengineer.com/wp-content/uploads/2015/10/knight-rider-season-3-218x300.jpg" alt="KITT larson scanner example"><figcaption> <p>KITT larson scanner example</p> </figcaption> </figure> <p>Even though it is a popular project for the Arduino Uno, most Larson scanner tutorials, <a href="https://www.baldengineer.com/arduino-chasing-leds-with-millis.html">like my first one</a>, have a few flaws. First, there is no persistence, or tail, to the LED as it moves back and forth. Persistence could be solved by using pulse-width-modulation. The Uno and other 328p-based micros only have 6 Pulse Width Modulation (PWM) pins. And let&rsquo;s be honest, every project is made better by adding more LEDs. :)</p>