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Use a piezoelectric transducer as microphone and a vox circuit to drive a relay for your motor.
DEAR,
i want to build a rain detector.the circuit should as to drive a motor from the rain detector.If anyone has idea it will be appreciated.
Then again, if morning dew is not an issue, I would say boncuks idea is the way to go
One more thing. We sometimes had problems with bird poop triggering the gauge...lol
I was thinking that both ideas might be susceptible to bird poop.
Torben
Good plan, only issue I see is if there is a lot of morning dew moisture that could build up and also activate the circuit.
Many, many years ago I use to work for NOAA. We had these rain gauges that work as follows.
There was a small rectangular metal container balanced on a pivot. It was maybe 4 to 5cm long. Kinda like a little metal bucket. In normal situation the rain bucket sat level, but as it would rain, the bucket would fill and pivot. The pivot action would trigger a microswitch. You could use this concept to have the trigger drive a relay. Then again, if morning dew is not an issue, I would say boncuks idea is the way to go
One more thing. We sometimes had problems with bird poop triggering the gauge...lol
You could improve that method by pouring the water into a measuring container. That way you could calculate the amount of precipitation per square meter or square yard. (Use a filter for the bird poops.)
Hi ctgroup,
the easiest way to make a rain detetector is making it from a small piece of PCB board. Check the screenshot please. The dimensions are 50X50mm with enough traces for a distinct change in resistance.
Connect the sensor to a comparator as shown in the screenshots, too.
The output swings from low to high if there is rain. To make it swing from high to low just connect the OpAmp by changing + and - input pins.
Hans
That's exactly how Forrest Mims designed a rain detector 20 years or more ago.
That's exactly how Forrest Mims designed a rain detector 20 years or more ago.
DEAR,
to drive a motor from the rain detector
-Have you an idea on how to make a fryness sensor or humidity sensor? It will be use to detect if the grains are dry...
-Thanks in advance.