Usage; Measurement Process; Socket; Presence Sensor (Pir) - Libelium Waspmote Technical Manual

3.3.2. Usage

With this sensor we can know the level of IR light and we can decide if enable the IR cut filter filtering the IR light or disable the
IR cut filter allowing the pass to all light.

3.3.3. Measurement process

This is a transistor in wich the current of this base varies depending on the intensity of the light received on its photoelectric
part. The current generated in base allows the conduction of current througt collector-emitter. The current produces a voltage
in a resistance connected between the emitter of the phototransistor and ground. The voltage of the resistance can be read
through the analog-to-digital converter of the microcontroller.
The sensor value can be read with the next function:
{
IR_value = readAnalog(SENS_IR);
}

3.3.4. Socket

Figure : Socket for IR sensor

3.4. Presence sensor (PIR)

3.4.1. Specifications

Height: 25.4mm
Width: 24.3mm
Length: 28.0mm
Consumption: 100μA
Range of detection: 6 ~ 7m
Spectral range: ~ 10μm
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Sensors
Figure : PIR presence sensor
v4.3