No additional micro-controller, & No HAT add-on module required. The Pi-Zero does it all.Sample use: Web Service state Indicator (e.g DowJonesIndex), Political or Sports event status indicator, mood light.See the video in step 6.The Raspberry-Pi only has one hardware supported PWM line. This project needs 3 PWM lines, so I use a software driven PWM 'c' library (http://wiringpi.com/reference/software-pwm-library/), which should already be installed.I broke up the processing into 2 processes. One, interrupt driven, switching the control lines to the LED as needed, getting its marching orders from its 'stdin' stream. The other is an event driven nodeJS server utilizing socket IO. This is to prevent things like light flickering while ensuring responsiveness. The combination typically uses less than 5% of the CPU. During times of continuous color updates (via sliders &/or many clients) it can easily use over 50% (especially when also using the browser in the Pi-Zero GUI). Note ...
This will get you started with the GPIO pins on the Raspberry Pi, using an API, and, of course, blinking morse code! After you have completed this tutorial, you can for example learn all of the morse code numbers or blink your IP address at startup, so you know which address to connect to!
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