How would one use flashing LEDs in a multiplexed array? Answered
I'm trying to setup a 2x6 multiplexed LED array using a 595 and an Arduino. I've got the circuit wired with 12 standard LEDs and it's working fine but I'd like to replace a couple of the LEDs with on/off flashing LEDs. The problem is that since it's multiplexed the LEDs are not receiving a constant current and this means the flashing LEDs never turn off because they don't have enough time to cycle to the off state.
My initial, and only, thought at this point is to put a small capacitor in front of the flashing LEDs. The hope being that while the pin is being addressed it would maintain at least a small amount of current through the LED and allow it to cycle on/off.
Does anyone have any issues or suggestions (cap size, type) about this plan? Is there something else that works or will this damage something or cause weird effects? I'm really quite rusty with the RC stuff I learned back in college so I really don't know how the cap will behave with non-constant source.