Luminosity (Luxes Accuracy) Sensor; Specifications; Measurement Process; Socket - Libelium Smart Cities PRO Technical Manual

Sensors

5.3. Luminosity (Luxes accuracy) Sensor

5.3.1. Specifications

Electrical characteristics
Dynamic range: 0.1 to 40000 lux
Spectral range: 300 ~ 1100 nm
Voltage range: 2.7 ~ 3.6 V
Supply current typical: 0.24 mA
Sleep current maximum: 0.3 μA
Figure: Image of the Luminosity Sensor
Operating temperature: -30 ~ 70 ºC

5.3.2. Measurement process

This is a light-to-digital converter that transforms light intensity into a digital signal output. This device combines
one broadband photo-diode (visible plus infrared) and one infrared-responding photo-diode on a single CMOS
integrated circuit capable of providing a near-photopic response over an effective 20-bit dynamic range (16-bit
resolution). Two integrating ADCs convert the photo-diode currents to a digital output that represents the irradiance
measured on each channel. This digital output in lux is derived using an empirical formula to approximate the
human eye response.
You can find a complete example code for reading the luminosity in the following link:
www.libelium.com/development/waspmote/examples/scp-v30-07-luxes-sensor

5.3.3. Socket

This sensor can be connected in socket 1, 2, 3, 4 and 5 in Waspmote OEM and sockets A, B, C, E and F in Plug &
Sense!
Figure: Luxes sensors connected in sockets 1, 2, 3, 4 and 5
In the image above we can see highlighted the four pins of the terminal block where the sensor must be connected
to the board. The white dot on the luxes board, must match the mark of the Smart Cities PRO Sensor Board.
Please mind that each socket has 3 rows, but only 2 are used for that sensor, because it only has 2x2 pins. A bad
connection can cause malfunction or even hardware damage.
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