For the next project, we're going to look at the
Led object API and test several different methods. This is one of the benefits of Johnny-Five—abstraction. If you can understand the concept of an LED, you can use the Johnny-Five LED object without thinking about the underlying pins or timings. Let's go over the methods that we'll use for our project:
on()andoff(): These turn an LED on and off. Under abstraction, this sets the pin that is wired to the LED toHIGHandLOW, respectively. We'll be using these in the REPL.blink(time): This turns an LED on and off at a given interval.strobe()andblink()are aliases of each other and do the same thing.pulse(time): This will cause an LED to pulse on and off in an eased manner. This requires an LED wired to a PWM pin. Thetimeargument sets the length of each side of the pulse—500will mean the LED will fade in for 500 ms and fade out for 500 ms, meaning a 1-second pulse.