I am using a pair of El Escudo boards on my arduino. I've stacked them and fed the digital I/O pins to the first one and manually wired the analog pins to the second one. All works fine - sort of.
I wanted more than eight wire segments, so I thought I could just set the analog pins to 255 or zero and turn those wire segments on and off. I've discovered that I can sometimes turn it on, but can't really turn it back off. Sometimes it doesn't turn back on, but only if it has already been on.
I suspect that because EL wire is mostly a capacitive load that I may need a bleeder resistor to ensure the port fully changes state.
Should I put a 10K resistor to ground from the analog port? One to vcc+? Both?