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| For a rain sensor I etched a 4x8 inch PCB with 2 interlocking
combs of tracks. 12V
is applied to one side through a 1M resister.
The other side feeds a transistor base.
The Emitter is grounded and the collector fed through an
optical isolator. Rain
provides a small current to the transistor base, which is enough
to power, the isolator. To
stop dew from collecting on the detector a series of ceramic
resistors warms the PCB. |
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The Poor Meadow Dyke Galleries are now open. THE
GALLERIES |
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See the full range of Atik cooled CCD cameras for
astronomy on the Atik Website
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