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Rain Detector

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  • Nicolae Sfetcu
    Rain Detector ... This circuit uses a sensor made of a small piece of etched PC board and a simple SCR circuit to detect rain and sound a buzzer. The SCR could
    Message 1 of 1 , Jul 31, 2002
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      Rain Detector


      This circuit uses a sensor made of a small piece of etched PC board and a simple SCR circuit to detect rain and sound a buzzer. The SCR could also be used to activate a relay, turn on a lamp, or send a signal to a security system.

      Schematic


      This is the schematic of the Rain Detector

      Parts


      Part
      Total Qty.
      Description
      Substitutions
      R111K 1/4 W Resistor
      R21680 Ohm 1/4 W Resistor
      D111N4001 Silicon Diode
      BZ1112V Buzzer
      S11SPST Switch
      SCR11C106B1 SCR106CY
      SENSOR1See Notes
      MISC1Board, Wire, Case, PC Board (For Sensor)

      Notes

      1. The sensor is a small piece of PC board etched to the pattern showen in the schematic. The traces should be very close to each other, but never touching. A large spiral pattern would also work.

      2. Make sure to use a loud buzzer.

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