I want to make an auto transmission circuit using a magnetic pickup sensor with output 0-3.5 AC Volts.
My device has 3 gears (1, 2, 3) and the one that's activated depends on sensors output. For example, if the output is 1.5V, then the first relay is activated. If voltage is increased, the circuit should deactivate the first relay and activate the second one and so on.
How do I do that? Any ideas?