Light (LUX)
User Manual
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1.3.
Sensor Specifications
> Range:
400-700 nm
[550 nm | peak spectral wavelength]
> Consumption:
~0.05 mA
1.4.
Features
>
Pre-conditioned analog output
>
Small form factor
>
High signal-to-noise ratio
>
Easy-to-use
>
Raw data output
1.5.
Applications
>
Synchronization with a computer screen
>
Ambient light monitoring
>
Optical marker detector
1.6.
Transfer Function (Conversion Formula)
The analog sensor signals acquired with
biosignalsplux
devices are converted into digital values ranged
between 0 and 2
n
-1 (
n=sampling resolution
, usually 8-bit or 16-bit) and streamed in the raw digital
format.
In most applications, a value between 0 and 1 describes the detection of light appearance of the
acquired
LUX
signal well, therefore a normalization is performed:
𝐿𝑈𝑋(−) =
ADC
2
n
- 1
(1)
Valid sensor range:
[0, 1]
with:
𝐿𝑈𝑋(−)
LUX normalized value
𝐴𝐷𝐶
Value samples from the sensor/channel (digital value)
𝑛
Sampling resolution (
default:
16-bit resolution (n=16), although 12-bit
and 8-bit may also be found)
The previous normalized value can be converted to a percentual metric through a simple multiplication
by the product factor 100%.
𝐿𝑈𝑋(%) = 𝐿𝑈𝑋(−) × 100%
