The version of the EV Sim that's in the store today has the comparator, but the one thing the comparator loses is the voltage levels.

OpenEVSE traditionally uses a three transistor network to sample and scale the ±12 volt range of the pilot to 0-5 volts, and then feeds that into an ADC pin of the controller. However, OpenEVSE has no need to attempt to divine the duty cycle of the pilot (after all, it's the EVSE generating it). I designed the comparator circuit originally because I was unsure that the duty cycle could be reasonably sampled given the extra latency required by the analog to digital conversion.

It turns out, however, that my fears were unfounded. An EV Sim based on the same sampling circuit works just fine. What you get from doing this is not only the ability to read the duty cycle, but you can also display the minimum and maximum voltages. The v4.0 EV Sim includes a button to switch between multiple display modes - the original one that shows the ampacity, and a new one that shows the minimum and maximum voltage. The voltage readings are not spectacularly accurate, but it's quite convenient, and the duty cycle measurements are just as accurate as it was with the comparator.

This version will go into the store as soon as stock of the current version runs out.