Glowscript:
// DEVICE PARAMETERS (modify with care)
// Elektra simulator
device: name = 'simulator-elektra-20'
device: type = 'sim'
device: tickIntervalMillisecs = '50' // increase to reduce CPU load.
device: protocolVersion = '1.0'
device: ledCount = '20'
device: ramSpaceBytes = '25000' // set an animation size limit in memory.
device: romSpaceBytes = '200000' // set an animation size limit on disk.
// DEFINES (modify as needed)
// LED defines:
define: innerLeds = '[1-4]' // alias for inner-ring leds.
define: middleLeds = '[5-12]'
define: edgeLeds = '[13-20]'
define: allLeds = '[1-20]'
// Color defines:
define: red = '(255,0,0,1)'
define: green = '(0,255,0,1)'
define: blue = '(0,0,255,1)'
define: yellow = '(255,255,0,1)'
define: white = '(250,250,250,1)'
define: orange = '(255,165,0,1)'
define: purple = '(255,0,255,1)'
define: off = '(0,0,0,1)'
// CODE
// Continuously loops.
// Each loop cycle has a 1.5 second duration.
@start // mandatory entry-point function name.
here: start_tag1 // set bookmark.
glowImmediate: allLeds yellow // set all LEDs to yellow.
pause: 750ms // pause for 750 milliseconds.
glowImmediate: allLeds off // turn all LEDs off.
pause: 750ms // pause for 750 milliseconds.
goto: start_tag1 // loop back to bookmark.