For digital clock, I have a 3 to 8 decoder driving six common anode,7-segment displays via PNP transistors. In a common scenario, display segments are strobed from 8 bits of the microchip pins. I have 220 Ohm resistors in series with each segment. Clock displays time format in "hh:mm:ss" where the minutes increment for each count "00 to 59".
I want to add 60 LEDs for mimicing a second hand moving around the circle of a clock face. LEDs must be off at the 12 O-Clock position, then illuminiate one LED, two LED, etc. for each second all around the face each minute.
Aside from 60 LEDs, I thought adding or modifying the above circuit with darlington transistors--it's base driven from the 8 bit port. Plus connecting individual segments to the darlington collector while figuring which LED's cathode to connect, illuminate and remain lit in sequence for each cycle of the simulated minute.
Do I need to reprogram my PIC for this? Or is there some extra decoder chips or whatnot I could use to create the desired LED analog effect?