Capacitive Rain Sensor

Capacitive Rain Sensor

                
FACE A =  Capacitive Sensor FACE B = Heating Circuit + NTC Thermisto

 

RC-SPC1K is an thick film technology rain sensor.
This device is realized in Allumina (AL2O3) substrate, this material is endowed a big reliability from an electrical thermal point of view.
The sensor consists of three parts :
1) Capacitive sensor (Face A)
2) Heater generator
3) Temperature Sensor

The Face A is the sensitivity area (capacitiver sensor) this area is expost to natural agent (rain) in dry condition the value of the capacitor is nominal 105pF,
In presence of the rain the capacitance goes to high valued respect the dry contidion the ratio changing is over 420%, in the table N.1 you can verify the capacitance change characteristics.

The Face B is present the heating circuit and the NTC component and the connection interface (six pads).


Checking these 3 functionsControllando queste 3 funzioni :

- Measure the capacitance  (Table 1)
- Measure the environment temperature (Table 2)
- Heater control (Tabella 3)

It's possible establish if it's raining or not.

Electrical Parameters  
Capacity Value  100 pF     10%
 R Value (heater) 42 Ohm   10%
 Thermistor NTC Value 1KOhm    10%

 

 

 

 

 

 

 

 

 

 

 

 

 Table 1 - Capacitive change characteristic
Sensitivity     Capacitance  Ratio 
% DRY  % WATER  pF  %
100  0  100  0
75  25  180  80
60  40  280  170
50  50  390  250
0  100  >550  >370

 

 

 

 

 

 

 

 

 

 

 

 

Table 2 - NTC Characteristic
Temperature °C   R nominal (Ohm)
-5  3572
0  2844
5  2280
10  1839
15  1492
20 1218
25 1000
30 825
35 685
40 571
45 479
50 403
55 341
60 290
65 247
70 212
75 182
80 157
85 136

 

 Table 3 - Heater Time 
Time (sec)   Temperature Sensor (°C)
0  27
15  40
30  50
45  60
60  70
75 75
90 77
105 78
120 81
135 83
150 85

 

 

 

 

 

 

 

 

 

ARDUINO Application (you can download the source files HERE


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