November 2000
Intermediate to advanced
336 pages
7h 43m
English
Content preview from Radio and Electronics Cookbook
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77
Water level alarm
Detecting water
Water is not too difficult to detect electrically, because it is a conductor of electricity. Not a good one, but sufficiently so to carry enough current to control a warning circuit.
The circuit is shown in Figure 1. If you imagine a resistor placed between the ends marked ‘water detector’, the circuit is then recognisable as a transistor used as an electronic switch. Whether the switch is off or on depends on the value of this resistor. If the resistance is low, the transistor ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.