Weather station WS-3000 probe

Weather station WS-3000 probe
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  • CH-9256-P
  • 9256-P
Sensor specifications (Anemometer) Sensitivity: 2.4 km/h / turn Wind Speed Range: 0 ~ 240... more
Product information "Weather station WS-3000 probe"

Sensor specifications (Anemometer)

Sensitivity: 2.4 km/h / turn

Wind Speed Range: 0 ~ 240 km/h

Height:   7.1 cm

Arm length: 8.9 cm

Connector: RJ11

The anemometer chosen for Waspmote consists of a Reed switch normally open that closes for a short period of time when the arms of the anemometer complete a turn, so the output is a digital signal whose frequency will be proportional to the wind speed in kilometers per hour (km/h).

Sensor specifications (Vane)

Height:            8.9 cm

Length:            17.8 cm 

Maximum accuracy: 22.5º

Resistance range: 688 Ω ~ 120 kΩ

The wind vane consists of a basement that turns freely on a platform endowed with a net of eight resistances connected to eight switches that are normally open and are closed (one or two) when a magnet in the basement acts on them, which permits us to distinguish up to 16 different positions (the equivalent to a resolution of 22.5º). The equivalent resistance of the wind vane, along with a 10 kΩ resistance, form a voltage divider, powered at 3.3 V, whose output can be measured in an analog input of the microcontroller. The function of the library readValue also stores in variable vane_direction an 8 bits value which corresponds with an identifier of the pointing direction. Below, a table with the different values that the equivalent resistance of the wind vane may take is shown, along with the direction corresponding to each value:

Direction (Degrees)

Resistance (kΩ)

Voltage (V)

Identifier

0

33

2.53

SENS_AGR_VANE_N

22.5

6.57

1.31

SENS_AGR_VANE_NNE

45

8.2

1.49

SENS_AGR_VANE_NE

67.5

0.891

0.27

SENS_AGR_VANE_ENE

90

1

0.3

SENS_AGR_VANE_E

112.5

0.688

0.21

SENS_AGR_VANE_ESE

135

2.2

0.59

SENS_AGR_VANE_SE

157.5

1.41

0.41

SENS_AGR_VANE_SSE

180

3.9

0.92

SENS_AGR_VANE_S

202.5

3.14

0.79

SENS_AGR_VANE_SSW

225

16

2.03

SENS_AGR_VANE_SW

247.5

14.12

1.93

SENS_AGR_VANE_WSW

270

120

3.05

SENS_AGR_VANE_W

292.5

42.12

2.67

SENS_AGR_VANE_WNW

315

64.9

2.86

SENS_AGR_VANE_NW

337.5

21.88

2.26

SENS_AGR_VANE_NNW

 

Besides, it is recommended to use the function getVaneFiltered in order to perform a mean filtered measurement during a specified period of time. Thus, mechanical fluctuations will be avoided and a more accurate measurement will be done.

Sensor specifications (Pluviometer)

Height:            9.05 cm

Length:         23 cm

Bucket capacity: 0.28 mm of rain

 

The pluviometer consists of a small bucket that, once completely filled (0.28 mm of water approximately), closes a switch, emptying automatically afterwards. The result is a digital signal whose frequency is proportional to the intensity of rainfall in millimeters of rain per minute (mm/min). The sensor is connected directly to a Waspmote digital input through a pull-up resistance and to the interruption pin TXD1, allowing the triggering of an interruption of the microprocessor when the start of the rain is detected.

Tip: the user can apply a little of paraffin on the pluviometer’s upper surface in order to help the rain drops to flow

down to the inside of the sensor.

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