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Last Updated on: Tuesday, June 01, 2021 03:06 PM

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More  Alarm and Light Sensitive Circuits

Snow Depth Alarm
Also see design in Circuit Solutions section

The 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 inch PVC pipe, forming a waterproof seal. 
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.

Snow Depth Indicator, designed by David Johnson

More  Alarm and Light Sensitive Circuits

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