I need to build a circuit that will run on 12 VDC and supply a ground on the output. The 2 inputs will vary according to one or both inputs that will be 0 to 5 VDC sensor. I need to be able to adjust at what voltage the output ground is triggered. Example if I need the ground triggered from sensor 1 input 1 at 3.5 volts that I can adjust the trigger point (rheostat?) to trigger the ground on the output at 3.5 volts. I need the same to happen from sensor 2 input 2. I might need it to trigger the ground at 2.8 volts from that sensor. Any help or direction would be appreciated. Or if somebody knows of a circuit already made I can buy.
I have attached a rough sketch