60-2 crank rotary speed signal generator on singlechip AT89C51

Based on the principle of 60-2 crank position magnetoelectricity sensor,a signal generator is designed to create the 60-2 crank position signal with singlechip AT89C51 as center,surrounded by time reset circuit,and D/A switch circuit.With this signal generator,ECU can be checked as the auto is not working.