An O2 or lambda simulator is used to send a simulated oxygen/lambda sensor signal to an engine ECU running in closed loop mode. O2 sensors generate voltages between 0.9V (rich) and 0.1V (lean). A ...

[Bob Blick] built this simulator from a 555 and few other common parts. Just when I thought I’d seen all the uses for the 555. The oxygen sensor on a cars exhaust is used to determine how efficiently ...

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