External LED Control

Blink
Phase 1

This circuit provide a simple blink capability to an LED. Many are quick to move on to another circuit before exploring the possibilities of this circuit.

• Challenge yourself or your students to blink the LED at several frequencies and have them calculate the delay periods needed to to this
• What is the fastest blink rate you can create and still see the blink (persistence of vision)
• Experience with PWM and duty cycle by changing the ON/OFF ratio
• Use a high-brightness LED and create a strobe light to explore rotating objects and make them appear to stand still
• Shake your LED back and forth after setting a low duty cycle PWM and high duty cycle PWM and notice what you see when you look at the LED

You can read about PWM by following this link https://www.arduino.cc/en/Tutorial/PWM