Initially I wanted to power this with a 9v battery, but the LDO voltage regulators I have draw a quiescent current of 50ua and that would make a 9v batter only last less than 170 days - and most of that power would be waisted by the regulator :-(.   Since the ATTiny85 can run from 2.8->6v I'll remove the regulator and power with three AA's.   *sigh*