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  1. pcbman

    SR04 ultrasonic module for outdoor use

    Moonwalker031, I understand that you need a narrow angle ultrasonic sensor in low budget but I highly doubt you’ll get a reliable one. I recently made such a trip-sensor for outdoors using laser beams which produce an interrupt when the beam is cut. The range was 250m which is quite a lot...
  2. pcbman

    Sound Intensity Measurement

    you need to either put the sensor closer to the source, or install multiple devices so that you can cover a wider area.

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