Introducing the rpi_led_simulator gem

require 'rpi_led_simulator'

# the symbol ● represents the round LED or ▋ to represent a bar LED
rpi = RPiLedSimulator.new(4, symbol: '●')

rpi.pins.first.blink duration: 3; rpi.watch

Output:

Here's a quick video, showing a virtual LED blinking for 4 seconds.

I was motivated to write this gem after experimenting with a super bright LED bar graph which wasn't good for my eyes to look at for any length of time. I could of course reduced the brightness, however that would have taken more effort in searching around for other resistors etc.

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