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DiscoverCircuits.com -- Hobby Corner
Last Updated on:
Tuesday, June 01, 2021 03:06 PM
Hobby Circuits List
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LINK to Dave's circuit, but DO NOT COPY any files to your WEB
SITE server |
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More
Alarm and Light
Sensitive Circuits |
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Snow Depth
Alarm
Also see design in Circuit Solutions
section |
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design of this system alerts a snowplow driver when the snow depth has exceeded four
inches. A visible red LED packaged in a 10mm package is pulsed at a rate of about 50Hz
with 10uS pulses. Twenty four inches away a phototransistor detects the light
from the LED. The LED and the phototransistor are housed in a section of ½ inch
PVC pipe, forming a waterproof seal. |
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A piece of PVC plastic covers both the LED and the phototransistor, so snow
does not fall directly onto the parts. At a depth of 4 inches, the snow accumulates
to a point, where the light path between the light source and emitter are blocked.
The blocked light path will activate an alarm, placed inside the house. A rest
button on the electronics box can turn off the alarm. Snow is then cleared off the
depth sensor, making it ready for another monitoring cycle. |
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