Rain Detector / Rain Sensor

Rain-sensorSome models come with a basic analogue to digital converter that's adjustable.  It requires a 3 volt and ground connection, and has a signal line which triggers when wet.

I wired the signal connector directly to a GPIO.  It may also run at 5volts but didn't want to risk the pi.

2pcs Rain Sensor Detector Module Raindrop Detection Shield Arduino Compatible US
2pcs Rain Sensor Detector Module Raindrop Detection Shield Arduino Compatible US $8.49
End Date: Thursday Sep-7-2017 17:51:46 PDT
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1 Rain detector module and sensor board kit for easy arduino interface DIY HW
1 Rain detector module and sensor board kit for easy arduino interface DIY HW $1.14
End Date: Monday Sep-4-2017 17:54:51 PDT
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1 Rain detector module and sensor board kit for easy arduino interface DIY TW
1 Rain detector module and sensor board kit for easy arduino interface DIY TW $1.29
End Date: Friday Aug-25-2017 23:49:49 PDT
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1Pc Hot Rain Detector Module Sensor Board Kit for Easy Arduino Interface DIY
1Pc Hot Rain Detector Module Sensor Board Kit for Easy Arduino Interface DIY $0.99
End Date: Monday Sep-11-2017 4:01:58 PDT
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1 Rain detector module and sensor board kit for easy arduino interface DIY 2O
1 Rain detector module and sensor board kit for easy arduino interface DIY 2O $1.29
End Date: Sunday Aug-27-2017 20:20:08 PDT
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RAIN DETECTOR BOARD FOR ARDUINO AND COMPATABLES SHIPS FROM US
RAIN DETECTOR BOARD FOR ARDUINO AND COMPATABLES SHIPS FROM US $0.99
End Date: Sunday Sep-10-2017 4:25:55 PDT
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CB7 Snow Raindrop Sensor Detector Module Rain Humidity Module for Arduino New
CB7 Snow Raindrop Sensor Detector Module Rain Humidity Module for Arduino New $2.58
End Date: Thursday Sep-14-2017 18:07:13 PDT
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Rain Drip Detector Module Shield Sensor Cable For AVR ARM Arduino Compatible
Rain Drip Detector Module Shield  Sensor Cable For AVR ARM Arduino Compatible $1.99
End Date: Saturday Aug-19-2017 20:26:55 PDT
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Rain Raindrops Snow Sensor Module Detector Pour Suspension Water Wetness Arduino
Rain Raindrops Snow Sensor Module Detector Pour Suspension Water Wetness Arduino $5.00
End Date: Sunday Sep-3-2017 2:09:52 PDT
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CB7 NEW Snow Raindrop Sensor Detector Module Rain Humidity Module for Arduino A
CB7 NEW Snow Raindrop Sensor Detector Module Rain Humidity Module for Arduino A $2.26
End Date: Sunday Aug-27-2017 0:31:23 PDT
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