From post #99 (referring to the schematic on that post):
The pot that used to set the threshold for when the input is rising now sets the threshold (range≈3.3V to 4V) for when the input is falling. The pot that looks like the hysteresis pot now sets the threshold for when the input is rising (range≈4.4V to 4.9V).
I explained all this before, but I know stuff like that gets lost in the noise.
Using your schematic as reference, the adjustment procedure is as follows:
1. First, set the 500k pot to its minimum (wiper to left end on schematic).
2. Apply +5V to the MAP input.
3. Check to be sure that pin 1 on the LM393 is low (≈0V).
4. Adjust the 1k pot so that the voltage on its wiper is 3.65V (or whatever you want it to be).
5. Set the 500k pot wiper to the other end (max resistance).
6. Set the MAP input to a voltage below that on the wiper of the 1k pot (somewhere between 0V and 3.65V - not critical), then run it up to the desired threshold (e.g., 4.7V).
7. Adjust the 500k pot slowly until pin 1 goes high.
8. Run input up and down slowly to see that pin 1 switches when the MAP voltage crosses the two thresholds you just est (3.65V and 4.7V, or whatever).
If this doesn't work, You may not hear from me until tomorrow. I'm going out gold prospecting today.
BTW, your LED is still upside down, and you have two R4's (the pots).