I am building a breathalyzer but I cannot use any programmable chips. We are using a comparator circuit to analyze the voltage output of the alcohol sensor. The problem we are having is that the output voltage of one of the comparators is 2V while the other is at the 5V we need to turn on the l.e.d. We are looking for a way to clean up the signal so that only one led is on. We tried using an inverter but 2V makes it go high so we are looking for another option. Thanks in advance for the help!