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I've designed a coin accepter for Ginsan company. It used two coils with the coin slot between them. A ~20Khz oscillator would drive one of the coils. A receiver would measure amplitude and phase of the coupled signals. That information can tell shape, metal type, and multicompositional metal...
Re: oil change light?
Many newer U.S. cars, have a sensor that provides a pulse per rotation, it is used by the on-board computer for speed, where it measures time between pulses. This could also run to a large digital counter which would count up to a value, and trip a registered led or...
Re: 220vac in 24V dc out?
Vicor (Vicor.com) makes some blocks that take ~300VDC in (You can use a bridge rectifier and cap, or power factor correction ckt if needed) that provide 24V 8A out.
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