Drive a motor? How big is the motor?
rain detector
- 14th August 2008 04:31 PM #1ctgroup
rain detector
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.
- 14th August 2008 06:02 PM #2blueroomelectronics Help us help you0
- 14th August 2008 07:42 PM #3Externet
Use a piezoelectric transducer as microphone and a vox circuit to drive a relay for your motor.
0Abolish the deciBel !
- 15th August 2008 05:38 AM #4Boncuk ... he could as well use a newspaper. If it gets wet holding it outside the window it's definitely raining. Then switch on the motor manually.
Originally Posted by Externet 
0I spread chaos where ever I am. Too bad I can't be everywhere.
- 15th August 2008 06:16 AM #5rjvh So the rain detector has a motor can you send a picture/sketch what you have in mind I think I would not be the only one who is curious to see what you mean Originally Posted by ctgroup
Robert-Jan0
- 15th August 2008 06:38 AM #6Boncuk
Rain detetector
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.
Hans0I spread chaos where ever I am. Too bad I can't be everywhere.
- 15th August 2008 06:46 AM #7Mikebits
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.
0acquiring knowledge is like doing a jig saw puzzle, many of the bits on their own dont make sense, but they are all needed to give a complete picture........... "Eric Gibbs"
www.geoepicenter.com
- 15th August 2008 07:31 AM #8Mikebits
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...lol0Last edited by Mikebits; 15th August 2008 at 07:32 AM.
acquiring knowledge is like doing a jig saw puzzle, many of the bits on their own dont make sense, but they are all needed to give a complete picture........... "Eric Gibbs"
www.geoepicenter.com
- 15th August 2008 08:30 AM #9Torben I was thinking that both ideas might be susceptible to bird poop. Originally Posted by Mikebits 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
Torben0Curiosity was framed. Ignorance killed the cat.
- 15th August 2008 08:33 AM #10Mikebits Without Dorthy and the scarecrow, there will always be bird poop Originally Posted by Torben I was thinking that both ideas might be susceptible to bird poop.
Torben 0acquiring knowledge is like doing a jig saw puzzle, many of the bits on their own dont make sense, but they are all needed to give a complete picture........... "Eric Gibbs"
www.geoepicenter.com
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