TY K,
OK, here is 'the spec' ...
(1) 4 'rings' of LEDS, each in parallel, for now, but will be optimising later.
(2) 1 blue ring, PWM (?) to pulsate.
(3) 3 red rings, Outer (O), Middle (M) and Inner (I).
(4) Sequence is O>M>I>O>M>I>O>M>I etc
(5) I will be running each ring, from a transistor, in reality.
My main problem (because I am a PICs programming newbie

), is how to get the blue ring pulsing, continuously, whilst the red rings sequence down from O to I.
Please excuse cludgy wiring



TYIA.
CS