Allright.
But as long as you assume your crank is true 45 degrees apart you can rely on the crank trigger. A hall sensor does more or less the same as the crank trigger right?
Waste spark doesn't bother me at all.
The camshaft sensor is basically providing an ECU with a home position to control fully sequential fuel and spark when used in conjunction with a crank sensor.
A hall sensor is a three wire powered sensor, power, ground and signal. It outputs a digital square voltage wave. Common reference voltage is right around 5 volts. VR sensor is a magnetic pickup. 2 wire, signal and ground. Teeth on the wheel change the magnetic flux as they pass by the sensor and this creates an alternating voltage, which the ECU has to condition to digital.